Everlight Electronics Co Ltd 的 EAAPMST3923A2 规格书

EVEFILIG-HT AMERICAS DATASH E ET www.everfightamericas .com
Ambient Light Sensor and
Proximity Sensor with I2C Interface
EAAPMST3923A2
Feature
ALS
-reading proportional to lux
-indoor light source flicker noise rejection
-matching human eye’s response (IR rejection)
-selectable 50/100/200/400/800 lux range
PS
-narrow band IR spectrum (850nm IRED is recommended)
-programmable IRED intensity
-100mA or 200mA pulsed driving current
-various periodic sleep time between each measurement
Interrupts
-independent ALS/PS interrupt thresholds
-adjustable interrupt persistence
Green Power
-less than 150μA DC supply current for ALS/PS sensing
-less than 0.1μA supply current when powered down
Easy to Use
-SMBus Compatible I2C interface
-auto register addressing
-interrupt pin and flags
Wide Operating Voltage Range
-1.7V to 3.6V supply for I2C interface
-2.3V to 3.6V sensor power supply
Wide Operating temperature Range
-40°C to 85°C ambient temperature
Size
-3.94mm (L) ×2.36mm (W) ×1.35mm (H)
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General Description
The EAAPMST3923A2 integrates an ambient light sensor (ALS), a proximity sensor (PS), an infrared
emitting diode (IRED) driver and an SMBus compatible I2C interface into one chip. The ALS and PS work
independently, and communication to the device is accomplished through the fast I2C interface (up to
750 kHz) for easy connection to a microcontroller or embedded controller. A flexible interrupt scheme is
provided for minimal microcontroller utilization.
The ambient light sensor (ALS) has 5 working ranges for adapting to different applications and various
opto-mechanisms. The ALS reading (output data) is proportional to the ambient light; not extra data
manipulation is required. It also has a built-in circuit to reject the 50Hz/60Hz flicker noise caused by indoor
light sources. The most distinguished feature of the ALS is that the spectral response is almost the same as
human eye’s photopic vision due to a well-engineered optional coating on the top of the ambient light
detector; thus, light source correction coefficient is mot necessary.
The proximity sensor (PS) employs a narrow-band, multi-layer optical coating to suppress most infrared
background. Synchronized with the built-in IRED driver, the proximity sensing circuitry adopts
track-and-hold (T&H) and correlated double sampling (CDS) techniques to reject non-synchronized infrared
signals and electrical DC offset. Each proximity measurement takes about 0.8mS, and various sleep-time in
between can be programmed through I2C interface to reduce overall power consumption.
The EAAPMST3923A2 provides a separate pin for level-style interrupt which simplifies and improves
system efficiency by eliminating the need to poll a sensor for an ALS or PS readings. An interrupt is generated
when the reading of an ALS or PS exceeds either an upper or lower threshold. In addition, a
programmable interrupt persistence feature allows the user to determine how many consecutive
exceeded readings are necessary to trigger an interrupt. Interrupt threshold and persistence settings are
configurable through I2C interface.
Applications
Display and keypad dimming adjustment and proximity sensing for:
-Mobile Devices: smart phone, PDA, GPS
-Computing Devices: laptop PC, notebook
-Consumer Devices: LCD-TV, digital picture frame, digital camera
Industrial and medical light and proximity sensing
DATASHEET
EAAPMST3923A2
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Rev. 0.01
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Package Dimensions
TOP View Side View
Bottom View
Unit: mm
Tolerances: ± 0.1mm
DATASHEET
EAAPMST3923A2
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PCB Layout Footprint
Unit: mm
Tolerances: ± 0.1mm
Pin Description
Pin No. Pin name Pin function
1 SDA I2C serial data line
2 INT Interrupt pin: LO for interrupt alarming. The INT pin is an open drain
3 IRDR IR LED driver pin connecting to the cathode of the external IR LED
4 LEDK Cathode of the embedded IR LED, connect to IRDR pin
5 LEDA Anode of the embedded IR LED, connect to power
6 GND Ground: The thermal pad is also connected to the GND pin
7 SCL I2C serial clock line
8 VDD Power supply voltage: 2.3V～3.6V
DATASHEET
EAAPMST3923A2
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Block Diagram
Typical Application Circuit
A typical application for the EAAPMST3923A2 is shown in Figure 1. The device can be tied onto a
system’s I2C bus together with other I2C compliant devices.
Figure 1. EAAPMST3923A2 typical application circuit
DATASHEET
EAAPMST3923A2
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Layout Considerations
The EAAPMST3923A2 is relatively insensitive to layout. Like other I2C devices, it is intended to
provide excellent performance even in significantly noisy environments. There are only a few
considerations that will ensure best performance. Route the supply and I2C traces as far as possible
from all sources of noise.
Absolute Maximum Ratings (TA=+25°C)
Parameter Rating Unit
VDD supply voltage 4.0 V
I2C bus voltage (SCL, SDA) --0.5 to 4.0V
IRDR pin voltage 5.5 V
ADDR pin voltage -0.5 to VDD+0.5 V
INT pin voltage -0.5 to 4.0 V
Caution: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions
may adversely impact product reliability and result in failures not covered by warranty.
Important Note: All parameters having Min/Max specifications are guaranteed. Typical values are
information purposes only. Unless otherwise noted, all tests are the specified temperature and pulsed tests,
therefore: TJ=TC=TA
DATASHEET
EAAPMST3923A2
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Electrical Characteristics (VDD=3.0V, T
A
=+25°C)
Note: The I2C bus protocol was developed by Philips (now NXP). For a complete description of the I2C protocol,
please review the NXP I2C design specification at http://www.i2c-bus.org/references/.
Parameter Descriptions Conditions Min. Typ. Max. Unit
VDD Power supply range 2.3 3.0 3.6 V
SR_VDD Power-up slew rate VDD rising edge between 0.4V
and 2.3V 0.5 - - V/ms
IDD_OFF
Supply current when both ALS and
PS is disabled ALS_EN = 0; PS_EN = 0 - 0.1 0.8 μA
IDD_NORM Supply current for ALS and PS ALS_RN = 1; PS_EN = 1 - 110 150 μA
IDD_PS_SLP
Supply current for PS with ALS begin
disabled ALS_EN = 0; PS_EN = 1 - 80 - μA
IDD_ALS
Supply current for ALS with PS begin
disabled ALS_EN = 1; PS_EN = 0 - 90 - μA
TINTER_ALS 12-bit ALS conversion time - 100 - mS
TINTGR_PS 8-bit PS conversion time - 0.8 - mS
COUNTALS_DK
ALS measurement when there is no
light EV = 0 lux, Range 4 - 0 - counts
COUNTALS_FS Full scale of ALS output - 4095 - counts
COUNTALS_0 ALS count in Range 0 (low resolution) EV = 800 lux, fluorescent lamp - 4095 - counts
COUNTALS_1 ALS count in Range 1 EV = 400 lux, fluorescent lamp - 4095
- counts
COUNTALS_2 ALS count in Range 2 EV = 200 lux, fluorescent lamp - 4095
- counts
COUNTALS_3 ALS count in Range 3 EV = 100 lux, fluorescent lamp - 4095
- counts
COUNTALS_4
ALS count in Range 4 (high
resolution) EV = 50 lux, fluorescent lamp - 4095
- counts
COUNTPS_DK PS measurement w/o object in path - 0 - counts
COUNTPS_FS Full scale of PS output - - 255 counts
tr Rise time for IRDR sink current RLOAD = 15Ω at IRDR, 20% to
80% - 0.5 - μS
tf Full time for IRDR sink current RLOAD = 15Ω at IRDR, 80% to
20% - 0.5 - μS
fI2C I2C clock rate - - 750 KHz
VI2C Supply voltage range for I2C interface 1.7 - 3.6 V
VIL SCL and SDA input low voltage - - 0.55 V
VIH SCL and SDA input high voltage 1.25 - - V
Rpull-up
SDA and SCL system bus pull-up
resistor
Maximum is determined by tR
and tf - 10 - KΩ
DATASHEET
EAAPMST3923A2
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Slave Address
The EAAPMST3923A2 provides the fixed slave address. In following table, it describes the command setting
ADDR Slave Address Command Address Operation
PULL LOW 0x44 (7-bits) 0x88 (8-bits) Write Command to EAAPMST3923A2
0x89 (8-bits) Read Data from EAAPMST3923A2
Register Map
There are eleven 8-bit registers accessible via I2C. Registers 0x01 and 0x02 define the operation mode of the
device. Registers 0x03 through 0x07 store the various ALS/PS thresholds which trigger interrupt events.
Registers 0x08 through 0x0A store the results of ALS/PS ADC conversions.
REG
ADDR
REG
NAME
BIT Default
7 6 5 4 3 2 1 0
0x00 Product ID Product ID Code for Communication Link Test (Write 0) 21h
0x01 CONFIGURE PS_EN PS_SLP[2:0] IRED_DR ALS_EN 0 0 BCh
0x02 INTERRUPT PS_FLAG PS_PRST[1:0] 0 ALS_FLAG ALS_PRST[1:0] INT_CTRL 8Bh
0x03 PS_LT PS_LT[7:0] 00h
0x04 PS_HT PS_HT[7:0] FFh
0x05 ALS_TH1 ALS_LT[7:0] 00h
0x06 ALS_TH2 ALS_HT[3:0] ALS_LT[11:8] F0h
0x07 ALS_TH3 ALS_HT[11:4] FFh
0x08 PS_DATA PS_DATA[7:0] 00h
0x09 ALS_DT1 ALS_DATA[7:0] 00h
0x0A ALS_DT2 0 ALS_DATA[11:8] 00h
0x0B ALS_RNG 0 ALS_RANGE[2:0] 00h
DATASHEET
EAAPMST3923A2
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Register 0x01 (Configure)
Bit # Access Name Function / Operation
7 RW PS_EN
(PS Enable)
When = 0, proximity sensing is disabled. When = 1, continuous
proximity sensing is enable. Proximity data will be ready 0.54ms after
this bit is set high
6:4 RW PS_SLP
(PS Sleep)
For bits 6:4 = (see the following)
111; sleep time between PS IR LED pulse is 0ms (run continuously)
110; sleep time between PS IR LED pulse is 12.5ms
101; sleep time between PS IR LED pulse is 50ms
100; sleep time between PS IR LED pulse is 75ms
011; sleep time between PS IR LED pulse is 100ms
010; sleep time between PS IR LED pulse is 200ms
001; sleep time between PS IR LED pulse is 400ms
000; sleep time between PS IR LED pulse is 800ms
3 RW IRED_DR
(PS Drive)
When = 0, IRDR behaves as a pulsed 100mA current sink
When = 1, IRDR behaves as a pulsed 200mA current sink
2 RW ALS_EN
(ALS Enable)
When = 0, ALS sensing is disabled. When = 1, continuous ALS
sensing is enabled with new data ready every 100mS.
1:0 RW Unused (write 0) Unused register bit – write 0
Register 0x02 (Interrupt)
Bit # Access Name Function / Operation
7 FLAG PS_FLAG
(PS Flag)
When = 0, no PS interrupt event has occurred since power-on or last
“clear”. When = 1, a PS interrupt event occurred. Clearable by writing
“0”.
6:5 RW PS_PRST
(PS Persist)
For bits 6:5 = (see the following)
00; set PS_FLAG if 1 conversion result trips the threshold value
01; set PS_FLAG if 4 conversion result trips the threshold value
10; set PS_FLAG if 8 conversion result trips the threshold value
11; set PS_FLAG if 16 conversion result trips the threshold value
4 RW Unused (write 0) Unused register bit – write 0
3 FLAG ALS_FLAG
(ALS FLAG)
When = 0, no ALS interrupt event has occurred since power-on or last
“clear”. When = 1, an ALS interrupt event occurred. Clearable by
writing “0”.
2:1 RW ALS_PRST
(ALS Persist)
For bits 2:1 = (see the following)
00; Every ALS cycle generates an interrupt.
01; set ALS_FLAG if 4 conversion are outside the set window
10; set ALS_FLAG if 8 conversion are outside the set window
11; set ALS_FLAG if 16 conversion are outside the set window
0 RW INT_CTRL
(Interrupt Control)
When = 0, set INTn pin low if PS_FLAG or ALS_FLAG high (logical
OR). When = 1, set INTn pin low if PS_FLAG and ALS_FLAG high
(logical AND)
DATASHEET
EAAPMST3923A2
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Register 0x03 (PS_LT)
Bit # Access Name Function / Operation
7:0 RW PS_LT
(PS Threshold) 8-bit interrupt low threshold for proximity sensing
Register 0x04 (PS_HT)
Bit # Access Name Function / Operation
7:0 RW PS_HT
(PS Threshold) 8-bit interrupt high threshold for proximity sensing
Register 0x05 (ALS_TH1)
Bit # Access Name Function / Operation
7:0 RW ALS_LT[7:0]
(ALS Low Thr.) Lower 8 bits (of 12 bits) for ALS low interrupt threshold
Register 0x06 (ALS_TH2)
Bit # Access Name Function / Operation
7:4 RW ALS_HT[3:0]
(ALS High Thr.) Lower 4 bits (of 12 bits) for ALS high interrupt threshold
3:0 RW ALS_LT[11:8]
(ALS Low Thr.) Upper 4 bits (of 12 bits) for ALS low interrupt threshold
Register 0x07 (ALS_TH3)
Bit # Access Name Function / Operation
7:0 RW ALS_HT[11:4]
(ALS High Thr.) Upper 8 bits (of 12 bits) for ALS high interrupt threshold
DATASHEET
EAAPMST3923A2
Rev. 0.01
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Register 0x08 (PS_DATA)
Bit # Access Name Function / Operation
7:0 RO PS_DATA
(PS Data) Result of 8-bit proximity sensor ADC conversion
Register 0x09 (ALS_DT1)
Bit # Access Name Function / Operation
7:0 RO ALS_DATA
(ALS Data) Lower 8 bits (of 12 bits) from result of ALS sensor conversion
Register 0x0A (ALS_DT2)
Bit # Access Name Function / Operation
7:4 RO Unused (write 0) Unused register bit
3:0 RO ALS_DATA
(ALS Data) Upper 4 bits (of 12 bits) from result of ALS sensor conversion
Register 0x0B (ALS RNG)
Bit # Access Name Function / Operation
7:3 R/W Unused (write 0) Unused register bit
2:0 R/W ALS_RANGE[2:0]
For bits 2:0 = (see the following)
000: ALS is in 800 lux range (0.195 lux / count)
001: ALS is in 400 lux range (0.098 lux / count)
010: ALS is in 200 lux range (0.048 lux / count)
011: ALS is in 100 lux range (0.024 lux / count)
100~111: ALS is in 50 lux range (0.012 lux / count)
DATASHEET
EAAPMST3923A2
Rev. 0.01
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Typical Electro-Optical Characteristic Curves (VDD=3.0V, T
A
=+25°C)
Fig 1. Shutdown current consumption vs. Supply voltage Fig 2. ALS output counts vs. Luminance
Fig 3. ALS current consumption operating vs. Supply voltage Fig 4. ALS view angle
Fig 5. PS current consumption operating vs. Supply voltage Fig 6. ALS & PS
spectral response
DATASHEET
EAAPMST3923A2
Rev. 0.01
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Principles of Operation
I2C Read/Write Register Data
The EAAPMST3923A2’s I2C slave address in 8-bit of write address is 0x88, read address is 0x89. Below
picture detail the protocol of writing or reading the register data inside the EAAPMST3923A2.
Figure 2. I
2C Write-Register-Data Protocol
Figure 3. I2C Read-Register-Data Protocol
DATASHEET
EAAPMST3923A2
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Ambient Light Sensing
Shown in below picture is the spectral response of EAAPMST3923A2’s ambient light sensor which
perfectly matches human eye’s photopic vision curve. Under the same luminance (lux), the ratio of the
ALS reading of an incandescent light source (rich of IR radiation) to that of a fluorescent light sources
(no IR radiation) is around 0.99; that means, the EAAPMST3923A2’s ALS can be a true lux meter regardless
of light sources. The EAAPMST3923A2 is set for ambient light sensing when register bit ALS_EN = 1.
Figure 4. Ambient light spectral response
Proximity Sensing
As illustrated in below picture, an infrared emitter (IRED), driven by the PS circuitry, emits synchronized
infrared pulsed. The object on the light path reflects the infrared radiation pulsed that are detected by the PS.
With a narrow band optical coating on the proximity sensor, the PS only receives the infrared around 850nm
wavelength, rejecting most ambient light interference. By using the track-and hold (T&H) and correlated
double sample (CDS) techniques, the PS is capable of measuring the intensity of reflected infrared pulsed.
Proper infrared baffle may be required due to the crosstalk from IRED to PS.
Figure 5. Proximity Sensing
DATASHEET
EAAPMST3923A2
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When the EAAPMST3923A2’s proximity sensing is enable (PS_EN=1), the PS takes about 0.54mS to take
one measurement. The pulsed driving current of the IRED can be 100mA in amplitude by setting
IRED_DR low (IRED_DR=0), or 200mA by setting IRED_DR high (IRED_DR=1). The sleep time (tsleep)
between proximity measurement is determined by setting the PS_SLP bits.
Interrupt Function
Four interrupt threshold registers allow the user to set limits below and above a desired light level and
proximity range. An ALS interrupt can be generated when the ALS data (ALS_DT) falls outside of the desired
light level range, as determined by the values in the ALS interrupt low threshold registers (ALS_LT) and ALS
interrupt high threshold registers (ALS_HT). Likewise, an out-of-range proximity interrupt can be generated
when the proximity data (PS_DT) falls below the proximity interrupt low threshold (PS_LT) or exceeds the
proximity interrupt high threshold (PS_HT).
To further control when an interrupt occurs, the device provides a persistence filter. The persistence filter
allows the user to specify the number of consecutive out-of-range ALS or proximity occurrences before an
interrupt is generated. The interrupt register (Register 0x02) allows the user to set the ALS persistence
(ALS_PRST) and the proximity persistence (PS_PRST) values. See the interrupt for details on the persistence
filter values. Once the persistence filter generates an interrupt, it will continue until a wire operation is
performed on Register 0x02.
The final interrupt option is the ability to AND or OR the two interrupt flags using Register 0x02 Bit 0
(INT_CTRL). If the user wants both ALS/PS interrupts to happen at the same time before changing the state
of the interrupt pin, set this bit high (AND operation). If the user wants the interrupt pin to change state when
either the ALS or the proximity interrupt flag goes high, leave this bit to its default of 0 (OR operation).
Figure 6. Interrupt operation
DATASHEET
EAAPMST3923A2
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VDD Power-up and Power Supply
Upon power-up, please ensure the slew rate of VDD greater than 0.5V/mS. After power-up , the supply
voltage shall NOT drop below 2.0V. Once it happens, please switch off the power, wait more than 1 second,
and then power on the device again.
Figure 7. Waveform of Supply Voltage VDD
Power-Down
To put the EAAPMST3923A2 into a power-down state, the user can set both PS_EN bits and ALS to 0 in
Register 0x01. Or more simply, set all of Register 0x01 to 0x00.
Calculating Lux
The EAAPMST3923A2’s ADC output codes are directly proportional to lux when in ALS mode (see
ALS_MODE bit.)
Ecalc = αRANGE × OUTADC
Ecalc is the calculated lux reading and OUT represents the ADC code. The constant α to plug in is
determined by the range bits ALS_RANGE (bit 2: 0 of register 0x0B) and is independent of the light source
type. Below Table shows five different scale factors: from 0.195 lux/count to 0.012 lux/count.
ALS_RANGE αRANGE (lux/count)
0.195
0
10.098
20.048
30.024
4~7 0.012
Table 1. ALS sensitivity at different range
DATASHEET
EAAPMST3923A2
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Label Format
Reel Dimensions
-
Unit: mm
Tolerances: ± 0.1mm
DATASHEET
EAAPMST3923A2
Rev. 0.01
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Notes:
1.2000pcs/Reel.
Moisture Resistant Packing Process
Symbol
Unit: mm
W F
12.00+0.1
-0.3 1.75±0.10 5.50±0.1
D0 D1 P0
1.50+0.10
--0
1.50+0.10
--04.00±0.1
P1 P2 t
4.00±0.10 2.00±0.1 0.3±0.05
0A0 K0
2.7±0.1 4.5±0.1 1.9±0.1
DATASHEET
EAAPMST3923A2
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Recommended Method of Storage
192 hours at 40°C +5/–0°C and < 5 % RH (reeled/tubed/loose units) or
96 hours at 60°C ± 5°C and < 5 % RH (reeled/tubed/loose units) or
24 hours at 125°C ± 5°C, not suitable for reel or tubes.
Recommended Solder Profile
Notice:
1. Reflow soldering should not be done more than two times.
2. When soldering, do not put stress on the devices during heating.
3. After soldering, do not warp the circuit board.
4. Reference: IPC/JEDEC J-STD-020D
DATASHEET
EAAPMST3923A2
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1. Do not open moisture proof bag before devices are ready to use.
2. Shelf life in sealed bag from the bag seal date: 18 months at 10°C~30°C and < 90% RH.
3. After opening the package, the devices must be stored at 10°C~30°C and ≤ 60%RH, and used within
168 hours (floor life).
4. If the moisture absorbent material (desiccant material) has faded or unopened bag has exceeded the
shelf life or devices (out of bag) have exceeded the floor life, baking treatment is required.
5. If baking is required, refer to IPC/JEDEC J-STD-033 for bake procedure or recommend the following
conditions:
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DISCLAIMER
1. EVERLIGHT reserves the right(s) on the adjustment of product material mix for the specification.
2. The product meets EVERLIGHT published specification for a period of twelve (12) months from date of
shipment.
3. The graphs shown in this datasheet are representing typical data only and do not show guaranteed values.
4. When using this product, please observe the absolute maximum ratings and the instructions for using outlined
in these specification sheets. EVERLIGHT assumes no responsibility for any damage resulting from the use of
the product which does not comply with the absolute maximum ratings and the instructions included in these
specification sheets.
5. These specification sheets include materials protected under copyright of EVERLIGHT. Reproduction in any
form is prohibited without obtaining EVERLIGHT’s prior consent.
6. This product is not intended to be used for military, aircraft, automotive, medical, life sustaining or life saving
applications or any other application which can result in human injury or death. Please contact authorized
Everlight sales agent for special application request.
DATASHEET
EAAPMST3923A2
Rev. 0.01