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BQ76952: BQ76952 current issue

user5959647
Intellectual 960 points

Part Number: BQ76952
Other Parts Discussed in Thread: BQSTUDIO

We used the logic analyzer to grab the current data of BQ76952, and did not read any data actually loaded by 0.5A.

0.5A充电IIC通讯数据.csv

  • 0
    TI__Expert 8526 points

    Hi Eric,

    From your Excel file, it looks like after giving the 0x3A direct command, you are receiving a current reading of 0x00 43 00.  This is in little endian format and corresponds to 0x43 00. 

    This is 17,152 in decimal format, or 17.152 A of current. 

    To help determine exactly what your problem is, I will need some more information. 

    • Are you able to provide a current reading using a multimeter to verify that this high current reading is incorrect? 
    • Can you provide the portion of your schematic with the sense resistor so I can see the connections and component values?
    • Can you issue the 0x3A command in BQStudio and capture the reading in the command sequence window like in the image below?  This will help determine if there is no value being returned, or an incorrect value.

    For more information on BQStudio and I2C communication with the BQ76952, please see the Software Development Guide linked here: BQ769x2 Software Development Guide (Rev. B) (ti.com).

    Best,

    Andria