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Software emulation on MCU or additional 125kHz IC?

We need to read/write 125kHz tags and emulate it with the same antenna.
As far I know the popular modules like RDM6300 can only read tags

We are looking for the chip that can:

  • Read LF tags and send the ID over I2C/SPI/UART
  • Write ID to rewriteable cards like T5577 by receiving ID to write over I2C/SPI/UART
  • Simulating tag by receiving ID to simulate over I2C/SPI/UART

I’m not sure that chip with this functionality even exist. So probably we need to do whole 125kHz RFID stack manually on the MCU.

Here is the some projects for reference:

Software 125khz emulation on Arduino https://github.com/AlexMalov/EasyKeyDublicatorRFID
Software 125khz emulation on ESP8266 https://github.com/Crypter/ESP-RFID

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As for write - t5577 is fully enough. so not need to look at another chips.
for read its better to have not a chip because usually universal device needs to read ASK,Biphase, Biphase inverted and FSK modulations.

We can’t integrate t5577 in device. I mean not a tag chip, but an RFID controller IC like pn532 for nfc.

i mean write to t5577. not needs to write to another r/w chips.

Here is the some projects for reference:
Software 125khz emulation on Arduino https://github.com/AlexMalov/EasyKeyDublicatorRFID
Software 125khz emulation on ESP8266 https://github.com/Crypter/ESP-RFID

Why not use Arduino or ESP8266 connected to board?

Because we already have STM32L4 MCU that can do all this stuff.