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BQ27427EVM: Communication issues with BQ27427EVM and EV2400

Yuxi Liu(Tony)
Intellectual 2100 points
Part Number: BQ27427EVM
Other Parts Discussed in Thread: EV2400, BQ27427, BQSTUDIO

Hi TIer

Customer cannot complete communication with EV2400 I2C and BQ27427EVM.

GUI can not find the device. I confirm I connected the battery in pack+ and pack- which is 3.6V.

I test VDD pin form BQ27427 LDO output pin. It is 0.3V. So it is 1.8V in normal right?

we are trying to replace the chip. If the board is damaged? Or what else?

What else our customers want to use a battery of maximum voltage 4.48V?Could our chip can support?

  • 0
    TI__Genius 17961 points

    Hello, 

    Do you mean that bqStudio is not auto detecting the gauge, or that in bqStudio you are not able to communicate to the gauge at all, even using advanced comm? 

    This gauge should be able to support a cell with max voltage of 4.48V as this is within the spec in the datasheet. One thing here is I would recommend using the GPCCHEM tool to ensure that the cells you are using are a good match to one of the three chemIDs supported by the gauge. 

    Regards, 

    Jonny. 

  • 0 in reply to Robert
    TI__Intellectual 2100 points

    What you mean is if the battery doesn't match any of the three chemistries very well, is the gauge not able to support that battery? Or are there other ways to learn to complete your design?

    Can you help me take a look at the EVM board, is there 1.8V on the LDO output pin when the battery is connected? I think my chip is damaged

  • 0 in reply to Yuxi Liu(Tony)
    TI__Genius 17961 points

    Hello, 

    If the battery is not matched well to any of the three chemIDs on the gauge, then there will be a decrease in the gauging accuracy. If this is the case, it is up to the customer whether the error is within their system's spec. An option here is to use one of our flash gauges that support all of the chemIDs, in this case, the customer would be far more likely to find a chemID that matches their cell. If there is still not an adequate match then the last option is to send the customer's cells in for characterization to obtain a custom chemID. 

    What power mode are you attempting to test this in? In shutdown mode, the LDO is disabled.

    Regards, 

    Jonny.