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BQ3060- Use of FETControl(0x46) for control of CHG FET

David Crosby
Prodigy 10 points
Other Parts Discussed in Thread: BQ3060

I have a requirement for a charger/gas gauge combination that provides a means of enabling/disabling battery charging over the I2C bus. I received a "customized" charger board that uses the BQ3060 for gas gauging/monitoring and where the CHG output (from BQ3060) is used to control a FET at the output of the charger (after current sense and output caps), and have been told that I can control it using the FETControl(0x46) command over the I2C bus. 

Reading the datasheet for the BQ3060, they indicate that this command should only be used "for test purposes only" and only when the chip is in UNSEALED or FULL ACCESS mode. My primary question is whether it is considered "safe" to use this control output for externally controlling a FET that is essentially connecting the charger output to the battery. What are the potential problems that could arise if this were used for charge enable/disable in a final product?

Thanks for any help in regards to this.

D. Crosby

  • 0
    TI__Guru 73830 points
    We do not recommend using the FETControl command to control the FETs in production, because it can override safety protection features. We recommend allowing the firmware to control the FETs. You are correct that the device has to be unsealed to use the FETContol command.