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Question of BQ76PL536 EVM writing error?

Eddy Lee
Intellectual 840 points
Other Parts Discussed in Thread: BQ76PL536

Hello,

We have a problem is BQ76PL536EVM writing error and we connected Device#1~#3.

But Device#1,#2 connected 5 battery cell is OK, but #3 connected 4 batterycell is not read value.(Writing and Read is not value.)

Please refer to the attached problem report and please your comment.

 

Best regards,

Eddy (eddy.lee@avnet.com)

BQ76PL536_OTP EPROM Write error.pdf

  • 0
    TI__Intellectual 2795 points

    I can see that in the first and last slides the stack voltage is shown as 36.895V, whereas it is 51.867V in all other slides. Can you please confirm what the VBAT supply is to each module during programming?

    Can you please share the schematic for the board used here? I am looking for potential connections to LDODx that could cause a problem during programming. 

    See the following note from the datasheet:

    NOTE
    For the Designer: Because the LDODx inputs are pulled briefly to approximately 7 V during
    programming, the LDODx pins should not be used as sources for pull-ups to 5-V digital pins, such
    as HSEL and SPI(bus)_H connected pins. Use VREG50 instead, unless all programming is
    completed prior to mounting on the application PCB, in which case LDODx is a good choice.

    If LDODx is used as a pullup supply, it is necessary to have a jumper to select VREG50 instead, just for programming.