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ST25DV null UID response · 2020-07-17

Hello ST communityI'm working with a ST25DV64K-JFR8D3 placed on a custom PCB and very rarely facing a weird issue, namely the UID response of the chip becomes 0000000000000000. This renders the device completely unresponsive, as no RF communication c...

Re: ST25DV null UID response · 2020-08-10

Thank You very much for the detailed description.After checking some things based on the suggestions above I was able to diagnose the cause of 00000000 UID response.The problem was bad soldering - the LPD pin under ST25DV was poorly connected to the ...

Re: ST25DV null UID response · 2020-08-05

Hello,i'm using 47k resistors pull-ups on the LPD pin as well as I2C lines.This value was gradually increased from 4.7k in order to reduce current consumption in device sleep mode, while still keeping its functionality.Best regardsDamian

Re: ST25DV null UID response · 2020-08-05

Yes, sure.There is an additional RTC clock M41T62 on the I2C bus. The bus has pull up resistors. There is an additional pull up resistor for the LPD pin of ST25, to ensure it stays in low power mode when the EEPROM memory is not written. The LPD pin ...

DPoto.1 · 2020-07-30

Hi,You could propably achieve this by utilizing the "RF sleep" feature of ST25DV.When enabled the chip will not respond to RF commands, and when Your microcontroller writes the required data to EEPROM memory it could disable the sleep feature in dyna...

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ST25DV null UID response

Re: ST25DV null UID response

Re: ST25DV null UID response

Re: ST25DV null UID response

Re: How can I ensure that the data in the EEPROM of the ST25DV64K is updated before the ST25DV64K is ready to be read out via RFID?