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BQ76930: What can prevent boot up from Ship Mode?

Mesifn Bedada
Prodigy 125 points
Part Number: BQ76930

Hi TI,

Our group is working on a battery management module using the BQ76930. We are having issues when it comes to booting the chip from SHIP MODE.  Currently there is no battery or a resistor bank connected to the cell input ports. I am working on establishing the I2C communication first and have been unable to consistently boot up. On the TS1 pin, there is a voltage divider with a switch that can provide 1.1V pulse. 

Can you please provide me with a check list that need to be available for the BQ76930 to boot? What can prevent it from booting?

Thanks,

Mesfin 

  • 0
    TI__Guru* 81035 points
    Hi Mesfin,

    Are you using the EVM or your own board? The pulse voltage you are providing to the TS1 pin is high enough as long as it is meeting the minimum pulse width requirement in the datasheet. The device also needs proper voltages to come out of POR (BAT-VC5x), (VC5x-VSS) must all be above the shutdown voltage of 3.6V. If nothing is connected to the cell inputs, this may be the problem.

    Best regards,
    Matt