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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Resolved! ST25R3911B-AQFT label marking

Hello dear,We received a product of ST25R3911B-AQFT, it shows COO Thailand, but we check the PCN paper, the lable should be ST25R3911B-AQWT, but the actual lable is ST25R3911B-AQT, is it normal and correct? Thanks a lot.

tp_exp01 by Associate
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  • 3 replies
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Resolved! ST25R3916B Writing To Registers Bare Metal

For my setup, I am using a nucleo-L476RG and a NFC08A1.  I am wanting to learn bare metal programming to really grasp micro controller programming.  I have programmed some smaller bare metal programs, SPI, I2C, etc on the nucleo.  Now, I am trying to...

cbarb2747 by Associate III
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  • 6 replies
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Resolved! ST25R3918: Excess current in Power-Down mode with I2C_EN HIGH (I²C mode); resolved by switching to SPI

Hi ST team,We’re using the ST25R3918 in a low-power BLE+NFC product. During testing, we noticed unexpected ~10 µA additional current draw when the chip was in Power-Down mode (with all VDD rails active), despite expecting ~1–2 µA per the datasheet.Af...

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BillR by Senior
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  • 2 replies
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Resolved! ST25R3917 Felica not Detect

Hello,I’m currently working on NFC detection using the ST25R3917 with Felica.My system configuration is as follows:PC Application ⇔ USB to I2C ⇔ ST25R3917I’m running RFAL in the PC application and have extended rfal_platform.c to control the USB to I...

tk_sorad by Associate II
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  • 5 replies
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Resolved! Layout Recommendations for ST3916 and ST3918

We are currently seeking layout recommendations for the ST25R3916 and ST25R3918 chips.On the Transmitter Side:ST25R3916B → Power Amplifier → Matching Circuit → AntennaOn the Reciever Side:Antenna → Matching Circuit →Power Harvester → ST25R3918The imp...

Resolved! Antenna Impedance measurement

Hello,I would like to confirm the correct procedure for measuring antenna impedance using a NanoVNA. The chip under test is the ST25R3916.I came across the post titled "How to Measure Antenna Parameters According to AN4974 with NanoVNA," which was ve...

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