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BQ76930EVM Load Detection

dtluigi
Intellectual 595 points
Other Parts Discussed in Thread: BQ76930, BQ78350, BQSTUDIO

Hi, we are using the Evaluation Board of the BQ76930 and we would use the Load Detection feature, but with or without a load on the P+/P- connectors, the LOAD_PRESENT bit in SYS_CTRL1 register is always set to 0 even with CHG_ON=0 & DSG_ON=0, though the CHG pin is pulled high (10V) with load.

What we miss?

  • 0
    TI__Guru 54715 points

    It seems you have the conditions right.

    There does need to be a load present on PACK to pull up PACK- and CHG because CHG has an internal pull down.  If you read 10V on CHG you must have a load.

    CHG_ON must be set low to enable the detection.  If you are using the TI evaluation software be sure it is set to "scan" or update the registers with the load present. If you are monitoring with a MCU software running, be sure it is not turning on the CHG_ON again.  When I have looked at this I had to make sure the load was persistent or I would miss the bit status because PACK- fell.  If your load is present and the registers are updated, the part must be damaged.

  • 0 in reply to WM5295
    Prodigy 10 points
    Hi ,
    I'm also having the issue above mentioned. I 'm using the bqStudio connected to the bq78350 by SMbus. When CHG and DSG are off and the load is present, the bqStudio alway shows the AFE SYS_CTRL1 ->0. I've also monitored the data flash register AFE Sys Control1 (0x41CA). Do you have any idea to solve the issue? Do I need to configure some register?