ST25 NFC/RFID tags and readers

Ask questions and find answers on ST25 NFC/RFID tags and readers, including connectivity implementations and antenna design.

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ST25R3918 I2C driver space-B access issue

Hello,I am writing interface for ST25R3918 NFC chip for our BSPs using I2C protocol. The datasheet of the chip mentions non-standard I2C command for space-B access that there is no ACK from chip after sending of first byte "FBh".I can see that ST pro...

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_AK by Associate
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ST25R3911B single ended read range

Hello,I'm currently working on a PCB prototype which uses the ST25R3911B as a front-end. I'm trying to handle multiple antennas in a time-multiplexed manner so i'm using both RFO pins and feeding them to RF switches (PE42421SCAA-Z, around 0.3-0.5 dB ...

mpapai by Associate
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Resolved! st25r3911b VHBR ISO 14443A

st25r3911b in 14443A mode TX: BITRATE_848 RX: BITRATE_1695 tx is successful,when  receive , switch B mode  , but  fail  :CRC error ,soft framing error and hard framing error how can I solve this problem or Which registers still need to be modified?

memo by Associate II
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Resolved! ST25R3918 NFC read power optimzation

Hi,we're working with the ST25R3918-AQWT in a design that's powered by a CR2054 coin cell. We're trying to minimize the peak current draw through the NFC coil since right now we're seeing about a 500mV droop on VBAT during our NFC read. We've already...

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BillR by Senior
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  • 6 replies
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