BQ20z75 communicating with a microcontroller

Leonardo14009

Hi guys,

I am trying to do the bq20z75 communicating with a microcontroller, but I didn't have a success to transform the I2C interface of the microcontroller in a SMBus interface.

I'd like to know if any one has already done it, and if any one could send me an example code of the bq20z75 communicating with a microcontroller, it doesn't matter what microcontroller, I would need some reference in this moment.

Thanks.

over 15 years ago

0 Leonardo14009 over 15 years ago

Prodigy 110 points

Hi,

I could read the voltage value from my bq20z75 with my microcontroller, but when I am debuging my code, it seems that the bq20z75 can not communicate with my microcontroller. Is this right? Does the bq20z75 have any particularity that it is impossible to debug it?

I hope some one can help me.

Thanks.

0 Wing Leung Wong over 15 years ago in reply to Leonardo14009

Prodigy 100 points

1. Timing Frame limited in 25ms

2 SMB_Data change status in Low of SMB_CLK

3 SMB_Data Hold stastus in High of SMB_CLK ;

4. ACK and PEC ( Skip the prameter under your bq20z75 setting ) to be take care how to handle it.

5. Detailed pls review smbus timing Spec V1.1 first

0 Leonardo14009 over 15 years ago in reply to Wing Leung Wong

Prodigy 110 points

Dear Wing,

I could do the bq20z75 communicates with the microcontroller, i could read the parameters but, i couldn't write any data on the bq20z75's Data Flash.

Please, you could access the data flash by your microcontroller (read and write), if yes, please do you have any suggestion to do it works?

Thanks

Leo

0 Jerome Martin over 14 years ago in reply to Leonardo14009

Intellectual 430 points

Hello Leonardo,

How did you transform the I2C interface to a SMBus interface ? What I2C address do you use for the bq20z75 ?

Thank you.

Jerome

0 Jerome Martin over 14 years ago in reply to Jerome Martin

Intellectual 430 points

I found the adress (0x16), but I cannot write to the data flash...

any help ?

Thank you.

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BQ20z75 communicating with a microcontroller