ST25R3914

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The ST25R3914/5 are highly integrated NFC Initiators / HF Reader ICs for automotive applications, AEC-Q100 grade 1 qualified, 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) 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 ST25R3914/5 are 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 technology, the devices are optimized for applications with directly driven antennas. The ST25R3914/5 are alone in the domain of HF reader ICs as they contain two differential low impedance (1 Ohm) antenna drivers.

The ST25R3914/5 include several features that make them very suited for low power applications. They contain 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. They also contain 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 ST25R3914/5 are 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.

Key Features

AEC-Q100 qualified
ISO 18092 (NFCIP-1) Active P2P
ISO14443A, ISO14443B and FeliCa™
Support HBR up to 848 kbit/s PICC to PCD and PCD to PICC framing
Capacitive sensing - Wake-up
Automatic antenna tuning system providing tuning of antenna LC tank (ST25R3914 only)
Automatic modulation index adjustment
AM and PM (I/Q) demodulator channels with automatic selection
Up to 1 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, 5 mm x 5 mm package

Resources

Technical Documentation

Product Specifications

	Description	Version	Size
	DB3075: Automotive high performance reader / NFC initiator with 1 W output power	1.0	58 KB

Application Notes

Description	Version	Size
AN4974: Antenna matching for ST25R3911B/ST25R391x devices	2.0	3 MB
AN4914: Automatic Antenna Tuning (AAT) of ST25R3911B/ST25R391x devices	2.0	1 MB
AN5043: Layout recommendations for the design of boards with ST25R3911B/ST25R391x devices	4.0	873 KB
AN4985: Wake-up mode of the ST25R3911B/ST25R391x	1.0	805 KB

Presentations & Training Material

Presentations

	Description	Version	Size
	ST25R series overview	1.0	3 MB

Publications and Collaterals

Flyers

	Description	Version	Size
	Automotive NFC/HF readers	1.0	933 KB
	High performance NFC/RFID readers	1.0	981 KB

Brochures

	Description	Version	Size
	NFC solutions from ST	1.0	3 MB

Tools and Software

Embedded Software

ST25 - NFC / RFID Software

Part Number	Manufacturer	Description
STSW-ST25R004	ST	Antenna Matching Tool for ST25R NFC/HF reader family
STSW-ST25R009	ST	Linux demo of ST25R3911B for Raspberry PI using XNUCLEO NFC05A1

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Sample & Buy

Part Number	Package	Packing Type	Marketing Status	Unit Price (US$) *	Quantity	ECCN (EU)	ECCN (US)	Country of Origin	More info	Order from ST	Order from Distributors
ST25R3914-AQFT	VFQFPN 5X5 32L PAD 3.5X3 PUNCHED	Tape And Reel	Active : Product is in volume production	3.8	1000	NEC	EAR99	-	MORE INFO		DISTRIBUTOR AVAILABILITY
ST25R3914-AQWT	VFQFPN 5X5X1 32L WETTABLE FLANKS	Tape And Reel	Preview : Product is in design stage	-	-	NEC	EAR99	-	MORE INFO		No availability reported, please contact our Sales office

(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office or our Distributors

Quality & Reliability

Part Number	Marketing Status	Package	Grade	RoHS Compliance Grade	Material Declaration**
ST25R3914-AQFT	Active	VFQFPN 5X5 32L PAD 3.5X3 PUNCHED	Industrial	N/A
ST25R3914-AQWT	Preview	VFQFPN 5X5X1 32L WETTABLE FLANKS	Industrial	Ecopack2

(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.