AS3911B NFC Initiator / HF Reader IC The AS3911B is a highly integrated NFC Initiator / HF Reader IC. General Description It includes 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 14443 A and B reader (including high bit rates) and FeliCa reader. Implementation of other 1 standard and custom protocols like MIFARE Classic is possible through using the AFE and implementing framing in the external microcontroller (Stream and Transparent modes). Compared with concurrent NFC devices designed with the mobile phone in mind, the AS3911B is positioned perfectly for the infrastructure side of the NFC system, where users need optimal RF performance and flexibility combined with low power. With ams unique Automatic Antenna Tuning technology, the device is optimized for applications with directly driven antennas. The AS3911B is alone in the domain of HF Reader ICs in that it contains two differential low impedance (1) antenna drivers. The AS3911B includes several features, which make it very well suited for low power applications. It contains a low power capacitive sensor, which can be used to detect the presence of a card without switching on the reader field. Additionally, 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 stored reference. It also contains a low power RC oscillator and wake-up timer, which can be used to wake the system after a defined time period and check for the presence of a tag using one or more techniques of low power detection of card presence (capacitive, phase or amplitude). The AS3911B is designed to operate from a wide power supply range from 2.4 V to 5.5 V peripheral interface IO pins support power supply range from 1.65 V to 5.5 V. Ordering Information and Content Guide appear at end of datasheet. 1. MIFARE and MIFARE Classic are trademarks of NXP B.V. ams Datasheet Page 1 v1-15 2016-Jun-10 Document FeedbackAS 39 11 B G e ne ral D e sc r i ption Key Benefits & Features The benefits and features of AS3911B, NFC Initiator / HF Reader IC are listed below: Figure 1: Added Value of Using AS3911B Benefits Features ISO 18092 (NFCIP-1) Active P2P NFC Active P2P support ISO14443 A, B and FeliCa (TM) High data transfer with ASK VHBR and Support of VHBR (3.4 Mbit/s PICC to PCD framing, 6.8 Mbit/s fast SPI AFE and PCD to PICC framing) 6A consumption at sensing every Capacitive sensing - Wake-up 100ms Automatic Antenna Tuning system providing tuning of Antenna tuning on the fly antenna LC tank Stable modulation index at ASK Automatic modulation index adjustment modulation AM and PM (I/Q) demodulator channels with automatic No communication holes selection High output power for EMVCo readers Up to 1 W in case of differential output High Rx sensitivity User selectable and automatic gain control Allows implementation of custom Transparent and Stream modes to implement MIFARE framings Classic compliant or other custom protocols Multi Antenna support Possibility of driving two antennas in single ended mode Oscillator input capable of operating with 13.56 MHz or Smaller Oscillator size 27.12 MHz crystal with fast start-up Easy FIFO handling 10 M bit SPI with 96 bytes FIFO Battery powered operation Wide supply voltage range from 2.4 V to 5.5 V Fits Temperature requirements for Wide temperature range: -40C to 125C various applications Small outline, good cooling through QFN 5x5 LD32 package exposed pad Page 2 ams Datasheet Document Feedback v1-15 2016-Jun-10