BQ35100: How to understand the waveform of BQ35100 communicated with bqstudio

Skate Lu

Intellectual 870 points

Part Number: BQ35100
Other Parts Discussed in Thread: BQSTUDIO, EV2400

I use EV2400 to communicated with my PCM by bqstudio.

I send the command 07 to read the terperature as following picture shows.

And I read the waveform with a logic analyzer as following picture shows.

I know that the last five sets of data represent 07, 0B ,14, 10, 01. But the first data is not represent AA .

And who can tell me the reason of this issue?

over 7 years ago

0 Onyx Ahiakwo over 7 years ago

TI__Guru* 76230 points

Hi Skate,
The data starts with the start condition. You can see the data going low first then the clock goes low indicating a start condition. Then you see the address which is AA -> 10101010 and then that slim pulse is the ACK. And then after that you see command 07 which is 00000111.

i hope this helps.

thanks
Onyx