ACR122 doesn't detect ST25DV04K

[Joris Straver]

Posted on June 19, 2018 at 11:04

Our new products have the ST25DV04K on board to identify them. We can read the NFC chip with our android phones. But the ACR122 from ACS doesn't detect the NFC. 

I tested the ACR122 with the X-NUCLEO-NFC01A1 and the X-NUCLEO-NFC04A1. The first one works fine, but the second one with the ST25 is also not detected by the ACR122.

Can you help us with this problem? Thanks

#st25dv04k #st25 #acr #acr122 #nfc

[NFC/RFID Customer support · Accepted solution]

Posted on June 20, 2018 at 10:39

Hi Joris,

as described on ACS internet web site :

'The

http://www.acr122.com/

is a PC-linked contactless smart card reader/writer developed based on 13.56 MHz Contactless (RFID) Technology. Compliant with the ISO/IEC18092 standard for Near Field Communication (NFC), it supports not only MIFARE® and ISO 14443 A and B cards, but also all four types of NFC tags.'

X-NUCLEO-NFC01A1 is based on M24SR series that is ISO14443-A RF protocol and is supported by ACR122 reader.

X-NUCLEO-NFC04A1 is based on ST25DV-I2C series that is ISO15693 / NFC TYPE5 RF protocol that is not supported by ACR122 reader.

This is the reason why ACR122 reader can be used with X-NUCLEO-NFC04A1. You need to select a reader supporting ISO15693 / NFC TYPE5 RF protocol.

Best regards

NFC/RFID ST support