• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 63 subscribers
  • Views 318 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

BQ21062: BQ21062- Not able to access I2C when VIN is not connected

Shani Ravaliya
Prodigy 190 points
Part Number: BQ21062

Hi Team, 

We are using BQ21062 battery charger IC and also using the load switch feature of this. We are using inbuilt load switch for the another circuitry power control, but we are facing some issue here.

1. I2C is active only when VIN is there, although we have connected VBATT to 4.1V using Regulated power supply.

2. We observe that while connecting the power on VIN then only we can able to access the I2C. As per our understanding I2C remain active in all the case while device is working/Sleep mode/Not Charging. there should be not strict dependency on VIN. can you please confirm?

3. We have to ON/OFF the load switch on runtime through I2C, Please suggest us if we need to take care any condition here? or some limitation is there for such use case? 

  • +1
    TI__Mastermind 31370 points

    Hi Shani, 

    I2C is only active during charge mode (when VIN is connected) and active battery mode. When VIN is not present the /LP (low power mode enable) input pin must be driven high to enter active battery mode and allow I2C communication. If the /LP pin is set low I2C will not be active. 

    For controlling the load switch through I2C enable/disable the switch through the EN_LS_LDO bit. One potential limitation to be aware of is when in low power mode (No VIN and /LP low) the load switch output will remain in the state set by EN_LS_LDO bit prior to entering LP mode. While the device is in low power mode I2C control of the load switch is disabled. 

    Regards,

    Garrett