BQ28Z610: bq28z610 I2C lockup issue

user4134045

Part Number: BQ28Z610

Hello sir

We use bq28z610 and have I2C SCL lockup issue(we found SCL keep low for certain time), we would like to know what is I2C bus low duration time if this lockup issue happen?

If not use R1 version, how to recover this issue? By sending a STOP or ACK or need to wait for certain time?

Our I2C bus connect to bq28Z610 and one DC converter. When MCU has command to DC converter , will this I2C bus low happen? Or it only happen when command is dedicate to bq28z610 or this I2C bus low happen random even the command is not for bq28z610?

Yihung

over 4 years ago

0 Jessica H. over 4 years ago

TI__Genius 11535 points

Hello Yihung,

This is most likely caused by clock stretching on one of the devices. The R1 version added a feature for a hardware reset of the I2C engine when a bus low signal occurs, which is usually due to a low bus timeout.

0 user4134045 over 4 years ago in reply to Jessica H.

Intellectual 320 points

Jessica

Is there any bus low signal time in your spec, like after 500uS lockup time,SCL could release?

How to release bus low issue?

I also need to know if bus low singal occurs random happen even the I2C command is not for bq28z610?

Yihung

0 Jessica H. over 4 years ago in reply to user4134045

TI__Genius 11535 points

Hi Yihung,

This is not in the bq28z610 spec, which is why it was added as a feature for the bq28z610-R1. It is possible for this signal to occur if the DC converter is clock stretching and causes something to timeout.

Power management

Power management forum

BQ28Z610: bq28z610 I2C lockup issue