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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) 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.主要特性
- ISO 18092 (NFCIP-1) Active P2P
- ISO14443A, ISO14443B 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 (I/Q) 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, 5 mm x 5 mm package
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生态系统
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图片 产品型号 制造商 描述 
X-NUCLEO-NFC05A1 ST 用于STM32和STM8 Nucleo的基于ST25R3911B的NFC读卡器扩展板 产品型号用于STM32和STM8 Nucleo的基于ST25R3911B的NFC读卡器扩展板
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软件
评估工具
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图片 产品型号 制造商 描述 
ST25R3911B-DISCO ST ST25R3911B高性能HF读写器/NFC发起设备探索套件，支持1.4 W输出功率、VHBR和AAT 
ST25R3911B-EMVCO -- ST25R3911B高性能HF读写器的EMVCo参考设计 产品型号ST25R3911B高性能HF读写器/NFC发起设备探索套件，支持1.4 W输出功率、VHBR和AAT
ST25R3911B高性能HF读写器的EMVCo参考设计
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质量与可靠性
| 产品型号 | Marketing Status | 封装 | 等级规格 | 符合RoHS级别 | 材料声明** |
|---|---|---|---|---|---|
| ST25R3911B-AQFT |
批量生产
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VFQFPN 5X5 32L PAD 3.5X3 PUNCHED | 工业 | Ecopack2 | |
| ST25R3911B-AQWT |
批量生产
|
VFQFPN 5X5X1 32L WETTABLE FLANKS | 工业 | Ecopack2 | |
| ST25R3911B-ASWB |
批量生产
|
US WF V.I. | 工业 | N/A |
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(**) st.com上提供的材料声明表单可能是基于包装系列中最常用的封装的通用文档。因此，它们可能不是100%适用于特定的设备。有关特定设备的信息，请联系 销售支持 。
样片和购买
| 产品型号 | 从分销商订购 | 从ST订购 | 供货状态 | ECCN (US) | ECCN (EU) | 包装类型 | 封装 | 温度（ºC） | Country of Origin | Budgetary Price (US$)*/Qty | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 最小值 | 最大值 | |||||||||||
| ST25R3911B-AQFT | 7 distributors | 样片和购买 立即购买 |
批量生产
|
EAR99 | NEC | Tape And Reel | VFQFPN 5X5 32L PAD 3.5X3 PUNCHED | -40 | 125 | SOUTH KOREA | 2.8 / 1k | |
| ST25R3911B-AQWT | 没有经销商，请联系我们的销售办事处 |
批量生产
|
EAR99 | NEC | Tape And Reel | VFQFPN 5X5X1 32L WETTABLE FLANKS | -40 | 125 | THAILAND | 2.8 / 1k | ||
| ST25R3911B-ASWB | 没有经销商，请联系我们的销售办事处 |
批量生产
|
EAR99 | NEC | Not Applicable | US WF V.I. | -40 | 125 | CHINA | 2.8 / 1k | ||
供货状态
批量生产ECCN (US)
EAR99Budgetary Price (US$)*/Qty
2.8 / 1k供货状态
批量生产ECCN (US)
EAR99Budgetary Price (US$)*/Qty
2.8 / 1k