CR95HF ISO14443A different baud rate

[Rumjantsev.Egor]

Posted on June 15, 2017 at 10:16

Hello, we made custom reader board with CR95HF. This reader is interfaces with IMX6 CPU running linux. Communication with reader via SPI bus.

I tried to read DOC9303 biometric passport. I can read it on default speed 106 kbit/sec without problem, now i'm trying to set double speed 212 kbit/sec i have problems with communication after ISO14443A-4 activation. There is no any answer after PPS responce.

Looks like the problem with some of wait time constant or similar other setting for Analog registers.

Is there any hints or set of such constants for different data baud rates?

WBR

#cr95hf #iso14443a

[Peter Boringer]

Posted on March 20, 2018 at 11:30

Hello egor,

The CR95HF support the  datarate 212 kbps in ISO 14443A

You have to 1st initiate the communication at 106kps

perform your anticollision sequence and RATS  request command

Then the PPS  with the appropriate setting 

04 04 D0 11 05 28

05 means 212 kbps for the 3rd byte of data.

Then you will have to change the reader speed by performing a new protocol select on the CR95HF

I suggest the following command.

 02 04 02 50 02 80

After you should be able to get the response from your tag, with a select application command  for exemple

Regards

P

[Rumjantsev.Egor]

Hello.

We decided not to use STM RF chips as it is very bad documented and does not have manufactorer support. We moved to NXP readrs.

Too bad for STM - they make chips, but not make good documents and support!