BQ76930: I2C communication with MCU fail, how to re-initial the I2C to get the system work again?

user4463016

Part Number: BQ76930

Dear friend,

I have faced a problem about the BMS which is made with BQ769x0. When the MCU lose communication from the I2C bus, it will never get recovery and the MCU can do nothing.

Can we control the I2C pullup resistor's +3.3V to let the I2C recover again?

Do you have any suggestion to deal with this issue?

Thanks.

Zeus Huang

over 5 years ago

0 Matt Sunna over 5 years ago

TI__Guru* 81035 points

Hi Zeus,

I think you may need to send 9 clocks so that the slave releases the bus. There is some good debug information that may be helpful in this thread: https://e2e.ti.com/support/power-management/f/196/p/742031/2739838

Best regards,

Matt

Power management

Power management forum

BQ76930: I2C communication with MCU fail, how to re-initial the I2C to get the system work again?