bq27742-G1: Reading hardware revision

Eric Steimle

Part Number: BQ27742-G1
Other Parts Discussed in Thread: BQSTUDIO

I just want to tell if my bq27742-G1 is alive on my board or not so naturally I think to try to read the hardware revision but it is a little bit confusing to me. For instance why are there two command ids on a read only register?

Can you give me an example of what I'd have to do to read this value?

Would my I2C accesses be something like:

write
Start	Address	CMD	Sub cmd	sub cmd	Stop	wait
S	0x55Wr	0x00	0x01	0x00	SP	66us

read					From Gauge
Start	Address	CMD	restart	Address	LSB	MSB	Stop	wait
S	0x55Wr	0x00	SR	0x55Rd	0x42	0x07	SP	66us

Thank you

over 8 years ago

0 Onyx Ahiakwo over 8 years ago

TI__Guru* 76230 points

pls see snippets below:

See TRM for further details.

thanks

Onyx

0 Eric Steimle over 8 years ago in reply to Onyx Ahiakwo

Expert 2290 points

Thanks for the response. I did read the datasheet, including that section, but I still did not understand things such as "where does the sub command go?". That's why I asked my question.

What's the TRM?

Thank you.