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BQ25970: BQ25970 standalone mode doesn't work

Part Number: BQ25970

HI Sr,

As caption,fortunately today I got a new one of EV2300 and I had try directly connect the EV2300 to the traget board what we made month ago with iic communication, the Program of Battery management studio V1.3.101 reminds me that there has two fauts (one is VUBS is too high for converter to start,another is Battery insert status not present),none of I regulate the input from 6-9Vdc, no charge current  comes from this chip to Battery.compared HW design several times base on your (bq25970 PWR893 Evaluation Module user's guide)no fauts are fund on HW, here is the screenshot,pls do me a favor that help me to debug this problem, some tips is very appreciated!



  • Hi Peter, 

    If these fault occur, it indicate that either battery is not connected to the system or battery voltage is too low.   

    Could you take scope waveforms of battery voltage, battery current, input voltage,  and /int signal at the instant when you enable charging?

    Another thing you can verify whether BQ25970 has valid battery voltage is to enable ADC first and then read VBATT ADC value.