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ST25R3911B-DISCO Brief Datasheet by STMicroelectronics
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For further information contact your local STMicroelectronics sales office.
June 2017 DocID030293 Rev 2 1/5
ST25R3911B-DISCO
Discovery kit for the ST25R3911B
high performance HF reader / NFC initiator
Data brief
Features
•Based on ST25R3911B high performance HF
reader / NFC initiator with 1.4 W output power,
supporting VHBR and AAT
– ISO 18092 (NFCIP-1) active P2P
– ISO14443A, ISO14443B and FeliCa™
– ISO15693
– Supports VHBR (3.4 Mbit/s PICC to PCD
framing, 6.8 Mbit/s AFE and PCD to PICC
framing)
– Up to 1.4 W output power with differential
antenna
– Possibility of driving two antennas in single
ended mode
– Inductive and capacitive Wake-up
– Automatic antenna tuning system
– DPO (Dynamic Power Output)
– User selectable and automatic gain control
– Transparent and Stream modes to
implement MIFARE™ Classic compliant or
other custom protocols
– 6 Mbit/s SPI
– Wide supply voltage range (from 2.4 V to
5.5 V)
– QFN32, 5 mm x 5 mm package
•STM32L476RET6 32-bit microcontroller with
512 kB of Flash memory
•105 mm x 52 mm, two turns antenna etched on
the PCB, and associated VHBR tuning circuit
•Micro-USB connector for communication with
the host PC and board powering
•Six LEDs indicating the presence of the RF
field and of the protocol used to communicate
www.st.com
Description ST25R3911B-DISCO
2/5 DocID030293 Rev 2
1 Description
The ST25R3911B-DISCO is a ready-to-use kit featuring the ST25R3911B, an highly
integrated HF reader / NFC initiator IC.
The ST25R3911B-DISCO can be operated as ISO18092 (NFCIP-1) active and passive
initiator, ISO18092 (NFCIP-1) active target, ISO 14443A and B reader including very high bit
rates (VHBR), long range ISO15693 and FeliCa™ reader. Implementation of other standard
and custom protocols like MIFARE™ Classic is possible using the AFE and implementing
framing in the external microcontroller (stream and transparent modes).
The ST25R3911B-DISCO addresses a wide range of applications such as access control,
ticketing, industrial, medical and consumer, where users need optimal RF performance and
flexibility combined with low power consumption.
The ST25R3911B-DISCO kit, whose block diagram is shown in Figure 1, allows the user to
exploit several features of the ST25R3911B.
It contains a low power capacitive sensor that can be used for ultra-low power wakeup
without switching on the reader field. Traditional inductive wakeup with the choice of
amplitude or phase measurement can be used as well.
The automatic antenna tuning (AAT) technology enables operation close to metallic parts
and/or in changing environments. The available software visually displays the impact of
AAT, thus enabling an easy evaluation of the feature.
Figure 1. Functional block diagram
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USB
SWD / JTAG
UART Host
Q SPI NFC
- . .
PC Host
DocID030293 Rev 2 3/5
ST25R3911B-DISCO Hardware configuration
5
2 Hardware configuration
The ST25R3911B-DISCO board can be connected via USB with a PC, and used as a
general purpose HF reader / NFC initiator. The additional UART and I²C Host interfaces
(see Figure 2) can be used to integrate the board directly into an existing setup.
A graphical user interface (GUI) can be downloaded from the NFC pages on www.st.com, it
enables easy communication with the board and allows the user to explore the
ST25R3911B features.
The board is configured to support ISO14443A/B, ISO15693, FeliCa™ and AP2P
communication.
By default a VHBR compatible matching is populated, this matching makes it possible to
achieve bit rates up to 3.4 Mbps. To maximize performance in applications where such very
high bit rates are not needed an alternative NFC Forum matching is available.
To switch to the NFC Forum matching the user only needs to exchange the components
listed in Table 1. This matching doubles the Q-factor, thus increasing the read range up to
10% when operating at bit rates up to 848 kbps (HBR). Operation at bit rates of 1.6 Mbps or
higher is not possible with the NFC Forum matching.
Figure 2. Position of main blocks on ST25R3911B-DISCO board
Table 1. Matching variants
Component VHBR matching NFC Forum matching
C404
Keep populated
Use C404_NFCF
C410 Use C410_NFCF
R401 Use R401_NFCF
R402 Use R402_NFCF
Revision history ST25R3911B-DISCO
4/5 DocID030293 Rev 2
3 Revision history
Table 2. Document revision history
Date Revision Changes
08-Feb-2017 1 Initial release.
26-Jun-2017 2 Updated image on cover page.
DocID030293 Rev 2 5/5
ST25R3911B-DISCO
5
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