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ST25R3911B-AQFT

High performance HF reader / NFC initiator with 1.4 W supporting VHBR and AAT

Manufacturer: STMicroelectronics, Inc
Mfr.Part #: ST25R3911B-AQFT
Datasheet: ST25R3911B-AQFT Datasheet (PDF)
Series: ST25R
Type: RFID Reader
Frequency: 13.56MHz
Standards: ISO 14443, NFC
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ST25R3911B-AQFT General Description

The ST25R3911B is a highly integrated NFC Initiator / HF reader IC, including the analog front end (AFE) and a highly integrated data framing system for ISO 18092 (NFCIP-1) initiator, ISO 18092 (NFCIP-1) active target, ISO 14443A and B reader (including high bit rates), ISO 15693 reader 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 is positioned perfectly for the infrastructure side of the NFC system, where users need optimal RF performance and flexibility combined with low power.Thanks to automatic antenna tuning (AAT) technology, the device is optimized for applications with directly driven antennas. The ST25R3911B is alone in the domain of HF reader ICs as it contains two differential low impedance (1 Ohm) antenna drivers.The ST25R3911B includes several features that make it very suited for low power applications. It contains a low power capacitive sensor that can be used to detect the presence of a card without switching on the reader field. The presence of a card can also be detected by performing a measurement of amplitude or phase of signal on antenna LC tank, and comparing it to the stored reference. It also contains a low power RC oscillator and wake-up timer that can be used to wake up the system after a defined time period, and to check for the presence of a tag using one or more low power detection techniques (capacitive, phase or amplitude).The ST25R3911B is designed to operate from a wide (2.4 V to 5.5 V) power supply range; peripheral interface IO pins support power supply range from 1.65 V to 5.5 V.Discovery kit for the ST25R3911B high performanc.NFC card reader expansion board based on ST25R39.

Key Features

ISO 18092 (NFCIP-1) Active P2P
ISO14443A, ISO14443B, ISO15693 and FeliCa™
Supports VHBR (3.4 Mbit/s PICC to PCD framing, 6.8 Mbit/s AFE and PCD to PICC framing)
Capacitive sensing - Wake-up
Automatic antenna tuning system providing tuning of antenna LC tank
Automatic modulation index adjustment
AM and PM demodulator channels with automatic selection
DPO (Dynamic power output)
Up to 1.4 W in case of differential output
User selectable and automatic gain control
Transparent and stream modes to implement MIFARE™ classic compliant or other custom protocols
Possibility of driving two antennas in single ended mode
Oscillator input capable of operating with 13.56 MHz or 27.12 MHz crystal with fast start-up
6 Mbit/s SPI with 96 bytes FIFO
Wide supply voltage range from 2.4 V to 5.5 V
Wide temperature range: -40 °C to 125 °C
QFN32, 5x5 mm package with wetable flank or wafer delivery

Specifications

Category	RF and WirelessRFID, RF Access, Monitoring ICs	Mfr	STMicroelectronics
Series	ST25R	Package	Tape & Reel (TR)Cut Tape (CT)Digi-Reel®
Product Status	Active	Type	RFID Reader
Frequency	13.56MHz	Standards	ISO 14443, NFC
Interface	SPI	Voltage - Supply	2.4V ~ 5.5V
Operating Temperature	-40°C ~ 125°C	Mounting Type	Surface Mount
Supplier Device Package	32-QFN (5x5)	Base Product Number	ST25
feature-packaging	Tape and Reel	feature-pin-count	32
feature-supplier-package	VFQFPN EP	feature-standard-package-name1	QFN
feature-cecc-qualified		feature-esd-protection
feature-military	No	feature-aec-qualified	No
feature-aec-qualified-number		feature-auto-motive	No
feature-p-pap	No	feature-eccn-code	EAR99
feature-svhc	Yes	feature-svhc-exceeds-threshold	No

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Ratings and Reviews

S**l 10/12/2023

Corresponds to the description, after the introduction i will describe in the work.

T**r 03/26/2023

Thank you, it came quickly. Not yet checked, but the view is good.

L**a 12/23/2022

Parcel fine, good. But shipping was teribble. Terrible cargo. Not on his stamp. You're expecting something you need. The thing is two weeks away. S the job you will do .....

O**t 11/16/2020

I ordered not myself, to check not a log.