TPS653850A-Q1: CRC for SPI interface

Howdy.

Our expert on this part is busy at the moment. Please expect a response by Friday.

Thanks for your patience.

Best, 

- David Martinez

Hi 

I am still waiting for the response

BR

Saman

Hello Saman,

We do not have any example code regarding an MCRC calculation. Can you outline exactly what it is you're trying to do?

Regards,

Alex

Hi Alex,

I am trying to write to a TPS653850  register (for example SENS_CTRL which WR_Address is 0x7B), with the value of 0x00, the MCRC value that should be transferred to the TPS653850 should be 0x35 (CRC-8) or 0xD0 (CRC-8/ROHC assuming initial value of 0xFF). 

But none of the above MCRC do not work (the register is not updated) . However, based on the evaluation SDI investigation with oscilloscope I realized that the correct value of the MCRC should be 0xE2. So, If I sent this MCRC through the MCU, the register will be updated. 

On the other hand, It is mentioned at the TPS653850 datasheet that CRC8 standard is used for MCRC calculation, but it seems that it is not following none of the standard CRC8 which is available on the net like: https://crccalc.com/ or https://www.lddgo.net/en/encrypt/crc

Can you help me on this issue?

I hope you have understood my problem, otherwise let me know.

BR

Saman

Hi,

Sorry for the delay. Please expect a response on Wednesday.

Best,

David

Hi David,

Is there any response available for my issue?

BR

Saman

Hey Saman.

The device expert for this part has been unavailable this week unfortunately. He told me he'll be back tomorrow to review your inquiries.

Thanks,

David Martinez