ams-OSRAM USA INC. 的 AS5601 规格书

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ams Datasheet Page 1

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AS5601

12-Bit Programmable Contactless

Encoder

The AS5601 is an easy-to-program magnetic rotary position

sensor with incremental quadrature (A/B) and 12-bit digital

outputs. Additionally, the PUSH output indicates fast airgap

changes between the AS5601 and magnet which can be used

to implement a contactless pushbutton function in which the

knob can be pressed to move the magnet toward the AS5601.

This AS5601 is designed for contactless encoder applications,

and its robust design rejects the influence of any homogenous

external stray magnetic fields.

Based on planar Hall sensor technology, this device measures

the orthogonal component of the flux density (Bz) from an

external magnet.

The industry-standard I²C interface supports user

programming of non-volatile parameters in the AS5601 without

requiring a dedicated programmer.

The AS5601 also provides a smart low-power mode which

automatically reduces power consumption

Ordering Information and Content Guide appear at end of

datasheet.

Key Benefits & Features

The benefits and features of AS5601, 12-bit Programmable

Contactless Encoder are listed below:

Figure 1:

Added Value of Using AS5601

Benefits Features

•Highest reliability and durability •Contactless angle measurement insensitive to dust and dirt

•Simple programming •Simple user-programmable zero position and device

configuration

•Flexible choice of the number of A/B

pulses per revolution •Quadrature output configurable from 8 up to 2048 positions

•Contactless pushbutton functionality •Pushbutton output by detecting sudden airgap changes

•Low power consumption •Automatic entry into low-power mode

•Easy setup •Automatic magnet detection

•Small form factor •SOIC-8 package

•Robust environmental tolerance •Wide temperature range: -40°C to 125°C

General Description

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AS5601 − General Description

Applications

The AS5601 is ideally suited for:

•Encoder replacement

•Contactless rotary knobs with push buttons

•Other angular position measurement solutions

Block Diagram

The functional blocks of this device are shown below:

Figure 2:

AS5601 Block Diagram

AFE

Automatic

Gain Control

(AGC)

12-bit A/D

One-Time

Programmable

(OTP) Memory

I²C

Low-Dropout

(LDO) Regulator

(internal load only)

AS5601

VDD5V

VDD3V3

GND

SDA

SCL

A/B Quadrature

Output Encoder B

ATAN

(CORDIC)

Dynamic

Magnitude

Monitoring PUSH

Magnetic Core

Hall Sensors Analog

Front-End

ams Datasheet Page 3

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AS5601 − Pin Assignments

Figure 3:

SOIC-8 Pin-Out

Pin Description

Figure 4:

Pin Description

Pin Number Name Type Description

1 VDD5V Supply Positive voltage supply in 5V mode

2 VDD3V3 Supply

Positive voltage supply in 3.3V mode (requires

an external 1-μF decoupling capacitor in 5V

mode)

3 PUSH Digital output Contactless pushbutton function output

4GNDSupply Ground

5 B Digital output Quadrature incremental signal B

6 SDA Digital input/output I²C Data

7SCLDigital inputI²C Clock

8 A Digital output Quadrature incremental signal A

Pin Assignments

VDD3V3

PUSH

GND

VDD5V

SDA

SCL

AS5601

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AS5601 − Absolute Maximum R atings

Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. These are stress

ratings only. Functional operation of the device at these or any

other conditions beyond those indicated under Operating

Conditions is not implied. Exposure to absolute maximum

rating conditions for extended periods may affect device

reliability.

Figure 5:

Absolute Maximum Ratings

Symbol Parameter Min Max Units Comments

Electrical Parameters

VDD5V DC supply voltage at

VDD5V pin -0.3 6.1 V 5.0V operation mode

VDD3V3 DC supply voltage at

VDD3V3 pin -0.3 4.0 V 3.3V operation mode

VAIO Voltage at all digital or

analog pins -0.3 VDD + 0.3 V

ISCR Input current (latch-up

immunity) -100 100 mA JESD78

Continuous Power Dissipation (TA = 70°C)

PTContinuous power

dissipation 50 mW

Electrostatic Discharge

ESDHBM Electrostatic discharge

HBM (human body model) ±1 kV MIL 883 E method 3015.7

Temperature Ranges and Storage Conditions

TSTRG Storage temperature range -55 125 °C

TBODY Package body temperature 260 °C

ICP/JEDEC J-STD-020

The reflow peak soldering

temperature (body

temperature) is specified

according to IPC/JEDEC

J-STD-020 “Moisture/Reflow

Sensitivity Classification for

Non-hermetic Solid State

Surface Mount Devices.” The

lead finish for Pb-free leaded

packages is “Matte Tin” (100%

Sn)

RHNC Relative humidity

(non-condensing) 585 %

MSL Moisture sensitivity level 3 ICP/JEDEC J-STD-033

Absolute Maximum Ratings

ams Datasheet Page 5

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AS5601 − Electrical Characteristics

All limits are guaranteed. The parameters with min and max

values are guaranteed with production tests or SQC (Statistical

Quality Control) methods.

Operating Conditions

Figure 6:

System Electrical Characteristics and Temperature Range

Note(s):

1. For typical magnetic field (60 mT) excluding current delivered to the external load and tolerance on polling times.

2. For OTP burn procedure the supply line source resistance should not exceed 1Ohm.

Symbol Parameter Conditions Min Typ Max Units

VDD5V Positive supply voltage in

5.0V mode

5.0V operation mode

4.5 5.0 5.5 V

During OTP burn procedure(2)

VDD3V3 Positive supply voltage in

3.3V mode

3.3V operation mode 3.0 3.3 3.6 V

During OTP burn procedure(2) 3.3 3.4 3.5 V

IDD Supply current in NOM (1) PM = 00 Always on 6.5 mA

lDD_LPM1 Supply current in LPM1 (1) PM = 01

Polling time = 5 ms 3.4 mA

lDD_ LPM2 Supply current in LPM2 (1) PM = 10

Polling time = 20 ms 1.8 mA

lDD_ LPM3 Supply current in LPM3 (1) PM = 11

Polling time = 100 ms 1.5 mA

IDD_BURN Supply current per bit for

burn procedure

Initial peak, 1 μs 100 mA

Steady burning, <30 μs 40 mA

TAOperating temperature -40 125 °C

TPProgramming

temperature 20 30 °C

Electrical Characteristics

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AS5601 − Electrical Characteristics

Digital Inputs and Outputs

Figure 7:

Digital Inputs and Outputs

Timing Characteristics

Figure 8:

Timing Conditions

Symbol Parameter Conditions Min Typ Max Units

V_IH High-level input

voltage 0.7 × VDD V

V_IL Low-level input

voltage 0.3 × VDD V

V_OH High-level output

voltage VDD - 0.5 V

V_OL Low-level output

voltage 0.4 V

I_O Output current

for A, B, and PUSH -2 2 mA

C_L Capacitive load

for A, B, and PUSH 50 pF

I_LKG Leakage current ±1 μA

Symbol Parameter Conditions Min Typ Max Units

T_DETWD Watchdog

detection time WD = 1 57 60 63 seconds

T_PU Power-up time 10 ms

F_S Sampling rate 150 μs

T_SETTL1 Settling time SF = 00 2.2 ms

T_SETTL2 Settling time SF = 01 1.1 ms

T_SETTL3 Settling time SF = 10 0.55 ms

T_SETTL4 Settling time SF = 11 0.286 ms

ams Datasheet Page 7

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AS5601 − Electrical Characteristics

Magnetic Characteristics

Figure 9:

Magnetic Characteristics

System Characteristics

Figure 10:

System Characteristics

Note(s):

1. An infinite fast change <180deg results in angle output with maximum configured update frequency.

2. An infinite fast change >= 180deg results in angle output to the shortest next absolute position with maximum configured update

frequency. e.g. A change from 0 to 270deg will be indicated as angle output from 0 to -90deg.

Symbol Parameter Conditions Min Typ Max Units

Orthogonal magnetic field

strength, regular output

noise ON_SLOW and

ON_FAST

Required orthogonal component

of the magnetic field strength

measured at the die's surface

along a circle of 1 mm

30 60 90 mT

Bz_ERROR

Minimum required

orthogonal magnetic field

strength, magnet

detection level

8mT

Symbol Parameter Conditions Min Typ Max Units

RES Core Resolution 12 bit

RES_AB A/B output resolution 8 2048 positions

VMAX_AB

Maximum rotation

speed for

incremental output

Continuous Rotation ≥ 360deg (1), (2) 456 rpm

INL_BL System INL

Deviation from best line fit; 360°

maximum angle, no magnet

displacement, no

zero-programming performed

±1 degree

ON_SLOW RMS output noise

(1 sigma)

Orthogonal component for the

magnetic field within the specified

range Bz, after 2.2 ms; SF = 00

0.015 degree

ON_FAST RMS output noise

(1 sigma)

Orthogonal component for the

magnetic field within the specified

range Bz, after 286 μs; SF = 11

0.043 degree

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AS5601 − Detailed Description

The AS5601 is a Hall-based rotary magnetic position encoder

that converts the magnetic field component perpendicular to

the surface of the chip into voltages which are used to produce

incremental A/B outputs and absolute position indication in

registers that can be read over an industry-standard I²C bus.

The analog signals from the Hall sensors are first amplified and

filtered before being converted by the analog-to-digital

converter (ADC) into binary data. The output of the ADC is

processed by the hardwired CORDIC block (Coordinate Rotation

Digital Computer) to compute the angle and magnitude of the

magnetic field vector. The intensity of the magnetic field is used

by the automatic gain control (AGC) to adjust the amplification

level to compensate for temperature and magnetic field

variations.

The angle value provided by the CORDIC algorithm is used by

the internal logic to generate the incremental quadrature

signals A and B. The magnitude and AGC value is dynamically

monitored and generates the PUSH output for fast changes of

the airgap between the magnet and the AS5601. Very slow

changes are suppressed to provide a robust and reliable

pushbutton output that tolerates temperature variation and

magnet degradation.

The AS5601 is programmed through an industry-standard I²C

interface to write an on-chip one-time programmable (OTP)

memory. This interface can be used to program a zero angle

and to configure the chip.

Power Management

The AS5601 is powered from a 5.0V supply using the on-chip

LDO regulator, or it can be powered directly from a 3.3V supply.

The internal LDO is not intended to power other external ICs

and needs a 1μF capacitor to ground, as shown in Figure 11.

In 3.3V operation, the VDD5V and VDD3V3 pins must be tied

together. VDD is the voltage level present at the VDD5V pin.

Detailed Description

ams Datasheet Page 9

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AS5601 − Detailed Description

Figure 11:

5.0V and 3.3V Power Supply Options

1µF

100nF

4.5 - 5.5V

VDD3V3

GND

VDD5V

5.0V Operation

LDO

AS5601

100nF

3.0 – 3.6V*

VDD3V3

GND

VDD5V

3.3V Operation

LDO

AS5601

10 µF**

** Required for OTP programming only

* 3.3-3.5V for OTP programming

ﬁﬁ

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AS5601 − Detailed Description

I²C Interface

The AS5601 supports the 2-wire Fast-mode Plus I²C-slave

protocol in device mode, in compliance with the NXP

Semiconductors (formerly Philips Semiconductors)

specification UM10204. A device that sends data onto the bus

is a transmitter and a device receiving data is a receiver. The

device that controls the message is called a master. The devices

that are controlled by the master are called slaves. A master

device generates the serial clock (SCL), controls the bus access,

and generates the START and STOP conditions that control the

bus. The AS5601 always operates as a slave on the I²C bus.

Connections to the bus are made through the open-drain I/O

lines SDA and the input SCL. Clock stretching is not included.

The host MCU (master) initiates data transfers. The 7-bit slave

address of the AS5601 is 0x36 (0110110 in binary).

Supported Modes

•Random/Sequential read

•Byte/Page write

•Automatic increment (ANGLE register)

•Standard-mode

•Fast-mode

•Fast–mode Plus

The SDA signal is the bidirectional data line. The SCL signal is

the clock generated by the I²C bus master to synchronize

sampling data from SDA. The maximum SCL frequency is 1 MHz.

Data is sampled on the rising edge of SCL.

I²C Interface Operation

Figure 12:

I²C Electrical Specifications

SDA

SCL

StartStop

tbuf

tLOW tR

tHD.STA

tHIGH

tSU.DAT tSU.STA

tHD.STA

tSU.STO

Repeated

Start

tHD.DAT

ams Datasheet Page 11

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AS5601 − Detailed Description

I²C Electrical Specification

Figure 13:

I²C Electrical Specifications

Note(s):

1. In Fast-mode Plus, fall time is specified the same for both output stage and bus timing. If series resistors are used this has to be

considered for bus timing.

2. Input filters on the SDA and SCL inputs suppress noise spikes of less than 50 ns.

3. I/O pins of Fast-mode and Fast-mode Plus devices must not load or drive the SDA and SCL lines if VDD is switched OFF.

4. Special-purpose devices such as multiplexers and switches may exceed this capacitance because they connect multiple paths

together.

Symbol Parameter Conditions Min Max Units

VIL Logic low input voltage -0.3 0.3 x VDD V

VIH Logic high input voltage 0.7 x VDD VDD + 0.3 V

VHYS Hysteresis of Schmitt

trigger inputs VDD > 2.5V 0.05 x VDD V

VOL

Logic low output voltage

(open-drain or

open-collector) at 3 mA

sink current

VDD > 2.5V 0.4 V

IOL Logic low output current VOL = 0.4V 20 mA

tOF Output fall time from

VIHmax to VILmax 10 120 (1) ns

tSP

Pulse width of spikes that

must be suppressed by

the input filter

50 (2) ns

IIInput current at each I/O

Input voltage

between 0.1 x VDD

and 0.9 x VDD

-10 +10 (3) μA

CBTotal capacitive load for

each bus line 550 pF

CI/O

I/O capacitance (SDA,

SCL) (4) 10 pF

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AS5601 − Detailed Description

I²C Timing

Figure 14:

I²C Timing

Note(s):

1. After this time, the first clock is generated.

2. A device must internally provide a minimum hold time of 120 ns (Fast-mode Plus) for the SDA signal (referred to the VIHmin of SCL)

to bridge the undefined region of the falling edge of SCL.

3. A Fast-mode device can be used in a standard-mode system, but the requirement tSU;DAT = 250 ns must be met. This is automatic if

the device does not stretch the low phase of SCL. If such a device does stretch the low phase of SCL, it must drive the next data bit

on SDA (tRmax + tSU;DAT = 1000 + 250 = 1250 ns) before SCL is released.

4. In Fast-mode Plus, fall time is specified the same for both output stage and bus timing. If series resistors are used, this has to be

considered for bus timing.

Symbol Parameter Conditions Min Max Units

fSCLK SCL clock frequency 1.0 MHz

tBUF

Bus free time (time

between the STOP and

START conditions)

0.5 μs

tHD;STA

Hold time; (Repeated)

START condition (1) 0.26 μs

tLOW Low phase of SCL clock 0.5 μs

tHIGH High phase of SCL clock 0.26 μs

tSU;STA

Setup time for a

Repeated START

condition

0.26 μs

tHD;DAT Data hold time (2) 0.45 μs

tSU;DAT Data setup time (3) 50 ns

tRRise time of SDA and SCL

signals 120 ns

tFFall time of SDA and SCL

signals 10 120 (4) ns

tSU;STO Setup time for STOP

condition 0.26 μs

ams Datasheet Page 13

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AS5601 − Detailed Description

I²C Modes

Invalid Addresses

There are two addresses used to access an AS5601 register. The

first is the slave address used to select the AS5601. All I²C bus

transactions include a slave address. The slave address of the

AS5601 is 0x36 (0110110 in binary). The second address is a

word address sent in the first byte transferred in a write

transaction. The word address selects a register on the AS5601.

The word address is loaded into the address pointer on the

AS5601. During subsequent read transactions and subsequent

bytes in the write transaction, the address pointer provides the

address of the selected register. The address pointer is

incremented after each byte is transferred, except for certain

read transactions to special registers.

If the user sets the address pointer to an invalid word address,

the address byte is not acknowledged (the A bit is high).

Nevertheless, a read or write cycle is possible. The address

pointer is increased after each byte.

Reading

When reading from an invalid address, the AS5601 returns all

zeros in the data bytes. The address pointer is incremented after

each byte. Sequential reads over the whole address range are

possible including address overflow.

Automatic increment of the address pointer for ANGLE, RAW

ANGLE, and MAGNITUDE registers:

These are special registers which suppress the automatic

increment of the address pointer on reads, so a re-read of these

registers requires no I²C write command to reload the address

pointer. This special treatment of the pointer is effective only if

the address pointer is set to the high byte of the register.

Writing

A write to an invalid address is not acknowledged by the

AS5601, although the address pointer is incremented. When the

address pointer points to a valid address again, a successful

write accessed is acknowledged. Page write over the whole

address range is possible including address overflow.

Supported Bus Protocol

Data transfer may be initiated only when the bus is not busy.

During data transfer, the data line must remain stable whenever

SCL is high. Changes in the data line while SCL is high are

interpreted as START or STOP conditions.

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AS5601 − Detailed Description

Accordingly, the following bus conditions have been defined:

Bus Not Busy

Both SDA and SCL remain high.

Start Data Transfer

A change in the state of SDA from high to low while SCL is high

defines the START condition.

Stop Data Transfer

A change in the state of SDA from low to high while SCL is high

defines the STOP condition.

Data Valid

The state of the data line represents valid data when, after a

START condition, SDA is stable for the duration of the high

phase of SCL. The data on SDA must only be changed during

the low phase of SCL. There is one clock period per bit of data.

Each I²C bus transaction is initiated with a START condition and

terminated with a STOP condition. The number of data bytes

transferred between START and STOP conditions is not limited,

and is determined by the I²C bus master. The information is

transferred byte-wise and each receiver acknowledges with a

ninth bit.

Acknowledge

Each I²C slave device, when addressed, is obliged to generate

an acknowledge after the reception of each byte. The I²C bus

master device must generate an extra clock period for this

acknowledge bit.

A slave that acknowledges must pull down SDA during the

acknowledge clock period in such a way that SDA is stable low

during the high phase of the acknowledge clock period. Of

course, setup and hold times must be taken into account. A

master must signal an end of a read transaction by not

generating an acknowledge bit on the last byte that has been

clocked out of the slave. In this case, the slave must leave SDA

high to enable the master to generate the STOP condition.

'FUﬂﬂ/wxxwm

ams Datasheet Page 15

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AS5601 − Detailed Description

Figure 15:

Data Read

Depending on the state of the R/W bit, two types of data transfer

are possible:

Data Transfer from a Master Transmitter to a Slave Receiver

The first byte transmitted by the master is the slave address,

followed by R/W = 0. Next follows a number of data bytes. The

slave returns an acknowledge bit after each received byte. If the

slave does not understand the command or data it sends a not

acknowledge (NACK). Data is transferred with the most

significant bit (MSB) first.

Data Transfer from a Slave Transmitter to a Master Receiver

The master transmits the first byte (the slave address). The slave

then returns an acknowledge bit, followed by the slave

transmitting a number of data bytes. The master returns an

acknowledge bit after all received bytes other than the last byte.

At the end of the last received byte, a NACK is returned. The

master generates all of the SCL clock periods and the START and

STOP conditions. A transfer is ended with a STOP condition or

with a repeated START condition. Because a repeated START

condition is also the beginning of the next serial transfer, the

bus is not released. Data is transferred with the most significant

bit (MSB) first.

1...19876...2 987

SDA

SCL

Start

Condition

Stop Condition or

Repeated Start Condition

MSB R/W ACKLSB ACK

Slave Address Repeated if more Bytes are transferred

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AS5601 − Detailed Description

AS5601 Slave Modes

Slave Receiver Mode (Write Mode)

Serial data and clock are received through SDA and SCL. Each

byte is followed by an acknowledge bit or by a NACK depending

on whether the address pointer selects a valid address. START

and STOP conditions are recognized as the beginning and end

of a bus transaction. The slave address byte is in the first byte

received after the START condition. The 7-bit AS5601 address is

0x36 (0110110 in binary).

The 7-bit slave address is followed by the direction bit (R/W),

which, for a write, is 0 (low). After receiving and decoding the

slave address byte, the slave device drives an acknowledge on

SDA. After the AS5601 acknowledges the slave address and

write bit, the master transmits a register address (word address)

to the AS5601. This is loaded into the address pointer on the

AS5601. If the address is a valid readable address, the AS5601

answers by sending an acknowledge (A bit low). If the address

pointer selects an invalid address, a NACK is sent (A bit high).

The master may then transmit zero or more bytes of data. If the

address pointer selects an invalid address, the received data are

not stored. The address pointer will increment after each byte

transferred whether or not the address is valid. If the address

pointer reaches a valid position again, the AS5601 answers with

an acknowledge and stores the data. The master generates a

STOP condition to terminate the write transaction.

Figure 16:

Data Write (Slave Receiver Mode)

S0110110 0 A XXXXXXXX AXXXXXXXX AXXXXXXXX A

S – Start

A – Acknowledge (ACK) Data transferred: X+1 Bytes + Acknowledge

P – Stop

<RW>

XXXXXXXX A

<Data(n+1)>

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AS5601 − Detailed Description

Slave Transmitter Mode (Read Mode)

The first byte is received and handled as in the slave receiver

mode. However, in this mode, the direction bit indicates that

the AS5601 will drive data on SDA. START and STOP conditions

are recognized as the beginning and end of a bus transaction.

The slave address byte is the first byte received after the master

generates a START condition. The slave address byte contains

the 7-bit AS5601 address. The 7-bit slave address is followed by

the direction bit (R/W), which, for a read, is 1 (high). After

receiving and decoding the slave address byte, the slave device

drives an acknowledge on the SDA line. The AS5601 then begins

to transmit data starting with the register address pointed to

by the address pointer. If the address pointer is not written

before the initiation of a read transaction, the first address that

is read is the last one stored in the address pointer. The AS5601

must receive a not acknowledge (NACK) to end a read

transaction.

Figure 17:

Data Read (Slave Transmitter Mode)

S0110110 1 A XXXXXXXX AXXXXXXXX AXXXXXXXX NA

S – Start

A – Acknowledge (ACK) Data transferred: X+1 Bytes + Acknowledge

NA – Not Acknowledge (NACK) Note: Last data byte is followed by NACK

P – Stop

<RW>

XXXXXXXX A

<Data(n+2)>

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AS5601 − Detailed Description

Figure 18:

Data Read with Address Pointer Reload (Slave Transmitter Mode)

SDA and SCL Input Filters

Input filters for SDA and SCL inputs are included to suppress

noise spikes of less than 50 ns.

S0110110 0 A XXXXXXXX A0110110 1XXXXXXXXA

S – Start

Sr – Repeated Start

A – Acknowledge (ACK) Data transferred: X+1 Bytes + Acknowledge

NA – Not Acknowledge (NACK) Note: Last data byte is followed by NACK

P – Stop

<RW>

XXXXXXXXA

<Data(n)>

<RW>

AXXXXXXXX NA

<Data(n+X)>

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AS5601 − Register Description

The following registers are accessible over the serial I²C

interface. The 7-bit device address of the AS5601 is 0x36

(0110110 in binary). To permanently program a configuration,

a non-volatile memory (OTP) is provided.

Figure 19:

Note(s):

1. To change a configuration, read out the register, modify only the desired bits and write the new configuration. Blank fields may

contain factory settings.

2. During power-up, configuration registers are reset to the permanently programmed value. Not programmed bits are zero.

Address Name R/W Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

Configuration Registers (1), (2)

0x00 ZMCO R ZMCO(1:0)

0x01

ZPOS R/W/P

ZPOS(11:8)

0x02 ZPOS(7:0)

0x07

CONF R/W/P

WD FTH(2:0) SF(1:0)

0x08 HYST(1:0) PM(1:0)

0x09 ABN R/W/P ABN(3:0)

0x0A PUSHTHR R/W/P PUSHTHR(7:0)

Output Registers

0x0C

RAW ANGLE

RRAW ANGLE(11:8)

0x0D R RAW ANGLE(7:0)

0x0E

ANGLE

R ANGLE(11:8)

0x0F R ANGLE(7:0)

Status Registers

0x0B STATUS RMDMLMH

0x1A AGC RAGC(7:0)

0x1B

MAGNITUDE

RMAGNITUDE (11:8)

0x1C R MAGNITUDE(7:0)

Burn Command

0xFF BURN W Burn_Angle = 0x80; Burn_Setting = 0x40

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AS5601 − Register Description

ZPOS Registers

These registers are used to configure the zero position (ZPOS).

This register is used to align the electric grid of the incremental

output with the mechanical grid of an encoder switch.

CONF Register

The CONF register supports customizing the AS5601. Figure 20

shows the mapping of the CONF register.

PUSHTHR Register

This register is used to set-up the contactless pushbutton

function. This register must be adjusted according to the airgap

and magnet configuration. The swing of the pushbutton

function can be found by subtracting the AGC value of the

pressed button from the AGC value of the released button. The

threshold value for the contactless pushbutton should be half

of the swing.

Figure 20:

CONF and ABN Mapping

Note(s):

1. Forced in Low Power Mode (LPM)

Name Bit Position Description

CONF Mapping

PM(1:0) 1:0 Power Mode

00 = NOM, 01 = LPM1, 10 = LPM2, 11 = LPM3

HYST(1:0) 3:2 Hysteresis

00 = OFF, 01 = 1 LSB, 10 = 2 LSBs, 11 = 3 LSBs

SF(1:0) 9:8 Slow Filter

00 = 16x (1); 01 = 8x; 10 = 4x; 11 = 2x

FTH(2:0) 12:10

Fast Filter Threshold

000 = slow filter only, 001 = 6 LSBs, 010 = 7 LSBs, 011 = 9 LSBs,100 = 18

LSBs, 101 = 21 LSBs, 110 = 24 LSBs, 111 = 10 LSBs

WD 13 Watchdog Timer

0 = OFF, 1 = ON (automatic entry into LPM3 low-power mode enabled)

ABN Mapping

ABN(3:0) 3:0

Output Positions and Update Rate

0000 : 8 (61 Hz)

0001 : 16 (122 Hz)

0010 : 32 (244 Hz)

0011 : 64 (488 Hz)

0100 : 128 (976 Hz)

0101 : 256 (1.9 kHz)

0110 : 512 (3.9 kHz)

0111 : 1024 (7.8 kHz)

others : 2048 (15.6 kHz))

ams Datasheet Page 21

[v1-07] 2016-Sep-09 Document Feedback

AS5601 − Register Description

ANGLE/RAW ANGLE Register

The RAW ANGLE register contains the unscaled and unmodified

angle. The scaled output value is available in the ANGLE register.

Note(s): The ANGLE register has a 10-LSB hysteresis at the limit

of the 360 degree range to avoid discontinuity points or

toggling of the output within one rotation.

STATUS Register

The STATUS register provides bits that indicate the current state

of the AS5601.

Figure 21:

STATUS Register

AGC Register

The AS5601 uses automatic gain control (AGC) in a closed loop

to compensate for variations of the magnetic field strength due

to changes of temperature, airgap between IC and magnet, and

magnet degradation. The AGC register indicates the gain. For

the most robust performance, the gain value should be in the

center of its range. The airgap of the physical system can be

adjusted to achieve this value.

In 5V operation, the AGC range is 0-255 counts. The AGC range

is reduced to 0-128 counts in 3.3V mode.

MAGNITUDE Register

The MAGNITUDE register indicates the magnitude value of the

internal CORDIC output.

Non-Volatile Memory (OTP)

The non-volatile memory is used to permanently program the

configuration. To program the non-volatile memory, the I²C

interface is used. The programming can be either performed in

the 5V supply mode or in the 3.3V operation mode but using a

minimum supply voltage of 3.3V and a 10 μF capacitor at the

VDD3V3 pin to ground. This 10 μF capacitor is needed only

during the programming of the device. Two different

commands are used to permanently program the device:

Name State When Bit Is High

MH AGC minimum gain overflow, magnet too strong

ML AGC maximum gain overflow, magnet too weak

MD Magnet was detected

Page 22 ams Datasheet

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AS5601 − Register Description

Burn_Angle Command (ZPOS)

The host microcontroller can perform a permanent

programming of ZPOS with a BURN_ANGLE command. To

perform a BURN_ANGLE command, write the value 0x80 into

to 3 times. ZMCO shows how many times ZPOS have been

permanently written.

This command may only be executed if the presence of the

magnet is detected (MD = 1).

Burn_Setting Command (CONF)

The host microcontroller can perform a permanent writing of

CONFIG with a BURN_SETTING command. To perform a

BURN_SETTING command, write the value 0x40 into register

0xFF.

The BURN_ SETTING command can be performed only one time.

Zero Position and Resolution Programming

A fundamental feature is to program the zero position (ZPOS)

of the magnetic position encoder. This is required to adjust the

A/B outputs to the mechanical pattern (grid) of a contactless

encoder by setting the count transitions (transition of A and or

B) between two adjacent mechanical positions. An example of

a 3-bit contactless encoder is shown in Figure 22.

The electrical positions represent the positions where an A or

B transition occurs. The zero position can be placed in

correspondence of one of the electrical positions (yellow).

A BURN_ANGLE command can be executed up to 3 times to

permanently program the zero position. It can only be executed

if the presence of the magnet is detected (MD = 1).

ams Datasheet Page 23

[v1-07] 2016-Sep-09 Document Feedback

AS5601 − Register Description

Figure 22:

Zero Position Setting of 3-Bit Encoder

Mechanical

position 1

Mechanical

position 2

Mechanical

position 8

Mechanical

position 3

Mechanical

position 4

Mechanical

position 6

Mechanical

position 5

Electrical

position 1

Electrical

position 2

Electrical

position 3

Electrical

position 4

Electrical

position 5

Electrical

position 6

Electrical

position 7

Electrical

position 8

Mechanical

position 7

Page 24 ams Datasheet

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AS5601 − Register Description

The configuration procedure for a rotary encoder is shown

below in Figure 23.

Figure 23:

Zero Position and Resolution Programming Procedure

Note(s):

1. After each register command, the new setting is effective at the output at least 1 ms later.

2. It is highly recommended to perform a functional test after this procedure.

3. At least 1 ms after each register command the new setting is effective at the output.

4. The BURN_ANGLE command can be executed up to 3 times and only if the presence of the magnet is detected (MD = 1).

Use the correct hardware configuration as shown in Figure 34

Step 1 Power up the AS5601.

Step 2 Configure the desired number of positions using ABN(3:0).

Step 3

The mechanical configuration snapped into the grid.

Read out the actual RAW ANGLE.

Calculate the compensation value to adjust the mechanical grid and the encoder angle.

Refer to Figure 22 and Figure 24. Write the compensation value into ZPOS.

Wait at least 1ms.

Step 4 Write the required setting into the configuration register CONF and PUSHTHR.

Wait at least 1 ms.

Proceed with Step 5 to permanently program the configuration.

Step 5 Perform a BURN_ANGLE command to permanently program the zero position.

Wait at least 1 ms.

Step 6 Perform a Burn_Setting command to permanently program the configuration.

Wait at least 1 ms.

Step 7

Verify the BURN commands:

Write the commands 0x01, 0x11 and 0x10 sequentially into the register 0xFF to load the

actual OTP content.

Read and verify the permanently programmed registers to verify that the

BURN_SETTINGS and BURN_ANGLE command was successful.

Step 8 Read and verify the permanently programmed registers again after a new power-up cycle.

>4 >< )4="">

ams Datasheet Page 25

[v1-07] 2016-Sep-09 Document Feedback

AS5601 − Register Description

Quadrature Encoder Output

With the setting ABN(3:0) it is possible to configure the number

of positions of the quadrature output. An example for a

configuration with 8 positions is shown below.

Figure 24:

Example Quadrature Output for 8 Positions

Position 012345678N

N-1N-2

N-3

Period

N/4N/4-1

Page 26 ams Datasheet

Document Feedback [v1-07] 2016-Sep-09

AS5601 − Register Description

Absolute Position Feature for Quadrature

Output

The absolute angular position of the magnet is transmitted on

the quadrature output of the position sensor after startup. By

counting these pulses after startup, the absolute position

within one turn of an encoder knob is known without separate

initialization as shown in Figure 25.

Figure 25:

Example Quadrature Output for Position 8dec After Startup

time

Transmitting absolute

position „8 dec“ after startup

Position

012345678 16 17 18 19 20 21 22 23 24

Slower movement to

position „16 dec“

Fast er move me nt t o

position „32 dec“

25 26 27 28 29 30 31 3214 15910111213

Startup Position

Faster

Rotation

Slower

Rotation

Absolut

position

known

ams Datasheet Page 27

[v1-07] 2016-Sep-09 Document Feedback

AS5601 − Register Description

Pushbutton Detection

The AS5601 implements a pushbutton detection function

through a dynamic and relative measurement of the orthogonal

magnetic field strength. This pushbutton detection function

drives the PUSH output pin high when the AS5601 detects a

fast increase of the magnetic field (decrease of the airgap

between the magnet and the AS5601). After a fast decrease of

the magnetic field, the PUSH output is driven low.

Figure 26:

Pushbutton Detection Function Specifications

Symbol Parameter Conditions Min Max Unit

PUSHTHR Magnetic field threshold 0 255 LSB

tpu_slope Push slope time 500 ms

tpu_dur

Push duration time NOM,

LPM1 PM = 0X 10 10000 ms

Push duration time LPM2 PM = 10 40 10000 ms

Push duration time LPM3 PM = 11 150 10000 ms

tpu_relax

Time gap between two

consecutive pushes in

NOM, LPM1

PM = 0X 40 ms

Time gap between two

consecutive pushes in

LPM2

PM = 10 40 ms

Time gap between two

consecutive pushes in

LPM3

PM = 11 150 ms

tpu_min_pulse Minimum duration of the

PUSH pulse 40 50 ms

tpu_recovery Recovery time after a very

long pushbutton event 5000 ms

BTH_VAR Push amplitude variation -20 +20 %

Page 28 ams Datasheet

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AS5601 − Register Description

Figure 27:

Pushbutton Detection Function

The AS5601 continuously measures the magnetic field

intensity. The programmable threshold (PUSHTHR) is applied to

a long time average of the magnetic field. A crossing of the

current magnetic field and the threshold within a specified time

(tpu_slope) drives the PUSH output high.

Slow changes of the magnetic field, due for example to

temperature variations, magnet drift mechanical tolerances,

etc. do not generate any pushbutton detection events. The

push detection threshold follows the drifts over the time as

shown in Figure 28.

PUSHTHR

tpu_slope tpu_dur tpu_slope tpu_relax time

Measured magnetic

field

Present measured

magnetic field

(button released)

Present measured

magnetic field

(button pressed)

PUSH

time

Push detection treshold

(long time averaged)

PUSHTHR Lang ‘ime averaged magne‘ic ﬁeld

ams Datasheet Page 29

[v1-07] 2016-Sep-09 Document Feedback

AS5601 − Register Description

Figure 28:

Magnetic Field Threshold Over Time

Step Response and Filter Settings

The AS5601 has a digital post-processing programmable filter

which can be set in fast or slow modes. The fast filter mode can

be enabled by setting a fast filter threshold in the FTH bits of

the CONF register.

If the fast filter is OFF, the step output response is controlled by

the slow linear filter as shown in Figure 30. The step response

of the slow filter is programmable with the SF bits in the CONF

for the different SF bit settings.

Figure 29:

Step Response Delay vs. Noise Band

SF Step Response

Delay (ms)

Max. RMS Output Noise

(1 Sigma) (Degree)

00 2.2 0.015

01 1.1 0.021

10 0.55 0.030

11 0.286 0.043

PUSHTHR

time

Long time averaged

magnetic field

Long time averaged

magnetic field

Push detection

treshold

Page 30 ams Datasheet

Document Feedback [v1-07] 2016-Sep-09

AS5601 − Register Description

Figure 30:

Step Response (fast filter OFF)

For a fast step response and low noise after settling, the fast

filter can be enabled. The fast filter works only if the input

variation is greater than the fast filter threshold, otherwise the

output response is determined only by the slow filter. The fast

filter threshold is programmed with the FTH bits in the CONF

SF=11) kicks in and takes care of a fast settling. The larger noise

band of the fast filter is reduced again after the slow filter

(depicted is setting SF=00) has taken over. The different noise

bands are shown in Figure 29.

Figure 31:

Fast Filter Threshold

FTH

Fast Filter Threshold (LSB)

Slow-to-Fast Filter Fast-to-Slow Filter

000 Slow Filter Only

001 6 1

010 7 1

011 9 1

100 18 2

101 21 2

110 24 2

111 10 4

Input

Output

response

Sampling

Frequency Settling Time

according slow filter setting

Noise

ams Datasheet Page 31

[v1-07] 2016-Sep-09 Document Feedback

AS5601 − Register Description

Figure 32:

Step Response (fast filter ON)

Hysteresis

To suppress spurious toggling of the output when the magnet

is not moving, a 1 to 3 LSB hysteresis of the 12-bit resolution

can be enabled with the HYST bits in the CONF register.

Magnet Detection

As a safety and diagnostic feature, the AS5601 indicates the

absence of the magnet. If the measured magnet field strength

goes below the minimum specified level (Bz_ERROR),

quadrature output is not updated and the MD bit in the STATUS

Input

Sampling

Frequency Settling Time

according slow filter setting

Noise

Fast Filter Noise

slow filter

Output

response

Fast filter step response

Threshold

Page 32 ams Datasheet

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AS5601 − Register Description

Low Power Modes

A digital state machine automatically manages the low power

modes to reduce the average current consumption. Three

low-power modes are available and can be enabled with the

PM bits in the CONF register.

In a low-power mode, the fast filter is automatically disabled,

because there is no need for a fast settling time if the output

refresh is as fast as the polling cycles.

Watchdog Timer

The watchdog timer allows saving power by switching into

LMP3 if the angle stays within the watchdog threshold of 4 LSB

for at least one minute, as shown in Figure 33. The watchdog

function can be enabled by setting the WD bit in the CONF

Figure 33:

Watchdog Timer Function

1 minute

Watchdog

threshold

LPM3 NOM,LPM1,

LPM2

NOM,LPM1,

LPM2

Output Value

4 LSB

ams Datasheet Page 33

[v1-07] 2016-Sep-09 Document Feedback

AS5601 − Application Information

Schematic

All required external components are shown below for the

reference application diagram. To improve EMC and for remote

applications, consider additional protection circuitry.

Figure 34:

Application Diagram for Angle Readout and Programming

Figure 35:

Recommended External Components

Note(s):

1. Given parameter characteristics have to be fulfilled over operation temperature and product lifetime

Component Symbol Value Units Notes

VDD5V buffer capacitor C1 100 nF 20%

LDO regulator capacitor C2 1 μF 20%; < 100 mΩ; Low

ESR ceramic capacitor

Optional pull-up for I²C bus RPU 4.7 kΩrefer to UM10204 for

pull-up sizing

Application Information

To MCU

4.5-5.5V

GND

AS5601

1 VDD5V

2 VDD3V3

3 PUSH

4 GND

A 8

SCL 7

SDA 6

B 5

PUSH

C1 C2

5V Operation

3-3.6V*

3.3V Operation

To MCU

GND

AS5601

1 VDD5V

2 VDD3V3

3 PUSH

4 GND

A 8

SCL 7

SDA 6

B 5

PUSH

C1 C**

* Supply voltage for permanent programming is 3.3–3.5V

** 10µF Capacitor required during permanent programming

Page 34 ams Datasheet

Document Feedback [v1-07] 2016-Sep-09

AS5601 − Application Information

Magnet Requirements

The AS5601 requires a minimum magnetic field component Bz

perpendicular to the sensitive area on the chip. The center of

the sensitive area is in the center of the package.

Along the circumference of the Hall element circle the magnetic

field Bz should be sine-shaped. The magnetic field gradient of

Bz along the radius of the circle should be in the linear range

of the magnet to eliminate displacement error by the

differential measurement principle.

Figure 36:

Magnetic Field Bz and Typical Airgap

The typical airgap is between 0.5 mm and 3 mm, and it depends

on the selected magnet. A larger and stronger magnet allows a

larger airgap. Using the AGC value as a guide, the optimal airgap

can be found by adjusting the distance between the magnet

and the AS5601 so that the AGC value is in the center of its

range. The maximum allowed displacement of the rotational

axis of the reference magnet from the center of the package is

0.25 mm when using a magnet with a diameter of 6mm.

0.5mm - 3mm typ.

; 0459:0100 «043520.100 JP ‘1.161:D‘150

ams Datasheet Page 35

[v1-07] 2016-Sep-09 Document Feedback

AS5601 − Application Information

Mechanical Data

The internal Hall elements are located in the center of the

package on a circle with a radius of 1 mm.

Figure 37:

Hall Element Positions

Note(s):

1. All dimensions in mm.

2. Die thickness 356μm nom.

DMII 2x “MI Ex Me TIPS we; k4 mm VIEW C SEE VIEW [2/ VIEW AiA h h / / D c F La I 5mm pLANE / SECTIDN BiB

Page 36 ams Datasheet

Document Feedback [v1-07] 2016-Sep-09

AS5601 − Package Drawings & Markings

Figure 38:

SOIC8 Package Outline Drawing

Note(s):

1. Dimensions & tolerancing confirm to ASME Y14.5M-1994.

2. All dimensions are in millimeters. Angles are in degrees.

Package Drawings & Markings

Symbol Min Nom Max

A--1.75

A1 0.10 - 0.25

A2 1.25 - -

b 0.31 - 0.51

c 0.17 - 0.25

D - 4.90 BSC -

E - 6.00 BSC -

E1 - 3.90 BSC -

e - 1.27 BSC -

L 0.40 - 1.27

L1 - 1.04 REF -

L2 - 0.25 BSC -

R0.07- -

R1 0.07 - -

h 0.25 - 0.50

Q0º-8º

Q1 5º - 15º

Q2 0º - -

aaa - 0.10 -

bbb - 0.20 -

ccc - 0.10 -

ddd - 0.25 -

eee - 0.10 -

fff - 0.15 -

ggg - 0.15 -

Green

RoHS

ams Datasheet Page 37

[v1-07] 2016-Sep-09 Document Feedback

AS5601 − Package Drawings & Markings

Figure 39:

Package Marking

Figure 40:

Packaging Code

YY WW RZZ @

Last two digits of the

manufacturing year Manufacturing week Plant identifier Free choice/traceability

code Sublot identifier

AS5601

YYWWRZZ

Page 38 ams Datasheet

Document Feedback [v1-07] 2016-Sep-09

AS5601 − Ordering & Contact Information

Figure 41:

Ordering Information

Buy our products or get free samples online at:

www.ams.com/ICdirect

Technical Support is available at:

www.ams.com/Technical-Support

Provide feedback about this document at:

www.ams.com/Document-Feedback

For further information and requests, e-mail us at:

ams_sales@ams.com

For sales offices, distributors and representatives, please visit:

www.ams.com/contact

Headquarters

ams AG

Tobelbader Strasse 30

8141 Premstaetten

Austria, Europe

Tel: +43 (0) 3136 500 0

Website: www.ams.com

Ordering Code Package Marking Delivery Form Delivery Quantity

AS5601-ASOT SOIC-8 AS5601 13” Tape & Reel in dry pack 2500 pcs

AS5601-ASOM SOIC-8 AS5601 7” Tape & Reel in dry pack 500 pcs

Ordering & Contact Information

ams Datasheet Page 39

[v1-07] 2016-Sep-09 Document Feedback

AS5601 − RoHS Compliant & ams Green Statement

RoHS: The term RoHS compliant means that ams AG products

fully comply with current RoHS directives. Our semiconductor

products do not contain any chemicals for all 6 substance

categories, including the requirement that lead not exceed

0.1% by weight in homogeneous materials. Where designed to

be soldered at high temperatures, RoHS compliant products are

suitable for use in specified lead-free processes.

ams Green (RoHS compliant and no Sb/Br): ams Green

defines that in addition to RoHS compliance, our products are

free of Bromine (Br) and Antimony (Sb) based flame retardants

(Br or Sb do not exceed 0.1% by weight in homogeneous

material).

Important Information: The information provided in this

statement represents ams AG knowledge and belief as of the

date that it is provided. ams AG bases its knowledge and belief

on information provided by third parties, and makes no

representation or warranty as to the accuracy of such

information. Efforts are underway to better integrate

information from third parties. ams AG has taken and continues

to take reasonable steps to provide representative and accurate

information but may not have conducted destructive testing or

chemical analysis on incoming materials and chemicals. ams AG

and ams AG suppliers consider certain information to be

proprietary, and thus CAS numbers and other limited

information may not be available for release.

RoHS Compliant & ams Green

Statement

Page 40 ams Datasheet

Document Feedback [v1-07] 2016-Sep-09

AS5601 − Copyright s & Disclaimer

material herein may not be reproduced, adapted, merged,

translated, stored, or used without the prior written consent of

the copyright owner.

Devices sold by ams AG are covered by the warranty and patent

indemnification provisions appearing in its General Terms of

Trade. ams AG makes no warranty, express, statutory, implied,

or by description regarding the information set forth herein.

ams AG reserves the right to change specifications and prices

at any time and without notice. Therefore, prior to designing

this product into a system, it is necessary to check with ams AG

for current information. This product is intended for use in

commercial applications. Applications requiring extended

temperature range, unusual environmental requirements, or

high reliability applications, such as military, medical

life-support or life-sustaining equipment are specifically not

recommended without additional processing by ams AG for

each application. This product is provided by ams AG “AS IS”

and any express or implied warranties, including, but not

limited to the implied warranties of merchantability and fitness

for a particular purpose are disclaimed.

ams AG shall not be liable to recipient or any third party for any

damages, including but not limited to personal injury, property

damage, loss of profits, loss of use, interruption of business or

indirect, special, incidental or consequential damages, of any

kind, in connection with or arising out of the furnishing,

performance or use of the technical data herein. No obligation

or liability to recipient or any third party shall arise or flow out

of ams AG rendering of technical or other services.

Copyrights & Disclaimer

ams Datasheet Page 41

[v1-07] 2016-Sep-09 Document Feedback

AS5601 − Document Status

Document Status Product Status Definition

Product Preview Pre-Development

Information in this datasheet is based on product ideas in

the planning phase of development. All specifications are

design goals without any warranty and are subject to

change without notice

Preliminary Datasheet Pre-Production

Information in this datasheet is based on products in the

design, validation or qualification phase of development.

The performance and parameters shown in this document

are preliminary without any warranty and are subject to

change without notice

Datasheet Production

Information in this datasheet is based on products in

ramp-up to full production or full production which

conform to specifications in accordance with the terms of

ams AG standard warranty as given in the General Terms of

Trade

Datasheet (discontinued) Discontinued

Information in this datasheet is based on products which

conform to specifications in accordance with the terms of

ams AG standard warranty as given in the General Terms of

Trade, but these products have been superseded and

should not be used for new designs

Document Status

Page 42 ams Datasheet

Document Feedback [v1-07] 2016-Sep-09

AS5601 − Revision Information

Note(s):

1. Page and figure numbers for the previous version may differ from page and figure numbers in the current revision.

2. Correction of typographical errors is not explicitly mentioned.

Changes from 1-06 (2016-Apr-22) to current revision 1-07 (2016-Sep-09) Page

Updated ANGLE/RAW ANGLE Register 21

Revision Information

ams Datasheet Page 43

[v1-07] 2016-Sep-09 Document Feedback

AS5601 − Content Guide

1 General Description

1 Key Benefits & Features

2 Applications

2 Block Diagram

3 Pin Assignments

3 Pin Description

4Absolute Maximum Ratings

5 Electrical Characteristics

5 Operating Conditions

6 Digital Inputs and Outputs

6 Timing Characteristics

7 Magnetic Characteristics

7 System Characteristics

8 Detailed Description

8Power Management

10 I²C Interface

10 I²C Interface Operation

11 I²C Electrical Specification

12 I²C Timing

13 I²C Modes

13 Invalid Addresses

13 Reading

13 Writing

13 Supported Bus Protocol

14 Bus Not Busy

14 Start Data Transfer

14 Stop Data Transfer

14 Data Valid

14 Acknowledge

16 AS5601 Slave Modes

16 Slave Receiver Mode (Write Mode)

17 Slave Transmitter Mode (Read Mode)

18 SDA and SCL Input Filters

19 Register Description

20 ZPOS Registers

20 CONF Register

20 PUSHTHR Register

21 ANGLE/RAW ANGLE Register

21 STATUS Register

21 AGC Register

21 MAGNITUDE Register

21 Non-Volatile Memory (OTP)

22 Burn_Angle Command (ZPOS)

22 Burn_Setting Command (CONF)

22 Zero Position and Resolution Programming

25 Quadrature Encoder Output

26 Absolute Position Feature for Quadrature Output

27 Pushbutton Detection

29 Step Response and Filter Settings

Content Guide

Page 44 ams Datasheet

Document Feedback [v1-07] 2016-Sep-09

AS5601 − Content Guide

31 Hysteresis

31 Magnet Detection

32 Low Power Modes

32 Watchdog Timer

33 Application Information

33 Schematic

34 Magnet Requirements

35 Mechanical Data

36 Package Drawings & Markings

38 Ordering & Contact Information

39 RoHS Compliant & ams Green Statement

40 Copyrights & Disclaimer

41 Document Status

42 Revision Information

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