The ST25R3912/3 are highly integrated NFC Initiators / HF Reader ICs, 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 ST25R3912/3 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 (AAT) technology (ST25R3913 only), the device is optimized for applications with directly driven antennas. The ST25R3912/3 are alone in the domain of HF reader ICs as they contain two differential low impedance (1 Ohm) antenna drivers.
The ST25R3912/3 include several features that make them very suited for low power applications. The presence of a card can 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 (phase or amplitude).
The ST25R3912/3 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.
|DS11794: High performance HF reader / NFC initiator for payment applications with 1 W output power||5.0||2 MB|
|AN4974: Antenna matching for ST25R3911B/ST25R391x devices||2.0||3 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|
|ST25R series overview||1.0||3 MB|
|High performance NFC/RFID readers||1.0||981 KB|
|Electric vehicle (EV) ecosystem||1.1||1 MB|
|NFC solutions from ST||1.0||3 MB|
|ST25R3911B-DISCO||ST||Discovery kit for ST25R3911B high performance HF reader / NFC initiator with 1.4 W output power, VHBR and AAT|
|Part Number||Package||Packing Type||Marketing Status||Unit Price (US$) *||Quantity||ECCN (US)||Country of Origin||More info||Order from ST||Order from Distributors|
|ST25R3912-AQWT||VFQFPN 5X5X1 32L WETTABLE FLANKS||Tape And Reel||Preview : Product is in design stage||2.8||1000||EAR99||-||MORE INFO||No availability reported, please contact our Sales office|
|ST25R3912-AWLT||WLCSP||Tape And Reel||Active : Product is in volume production||2.8||1000||EAR99||-||MORE INFO||DISTRIBUTOR AVAILABILITY|
|Part Number||Marketing Status||Package||Grade||RoHS Compliance Grade||Material Declaration**|
|ST25R3912-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.