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BQ25730: BQ25730: output voltage reduce issue

kadam shah
Prodigy 70 points

Part Number: BQ25730

Hello Team,

We are using BQ25730RSNR battery charger in our design. We have configured battery charger for 2S Lithium Ion Battery pack configuration. At Pin#18 (CELL_BATPRESZ), we are getting 2.4V. At output we are getting 5.19V instead of 6.6V. Please suggest why output voltage is getting reduced?

Thanks

  • 0
    TI__Mastermind 39141 points

    Hello Kadam,

    Can you provide schematic and register dump when this behavior occurs?

    Best Regards,

    Christian

  • 0 in reply to Christian Moyer
    Prodigy 70 points

    Hello Christian,

    register dump details during battery charge condition

    / # i2cdump -f -y 20 0x6B
    0 1 2 3 4 5 6 7 8 9 a b c d e f 0123456789abcdef
    00: 0e 00 00 00 d0 20 c4 09 00 3c 80 01 00 34 00 20 ?...? ??.<??.4.
    10: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ????????????????
    20: 00 80 00 b8 00 20 00 9b 00 00 00 00 00 23 40 d5 .?.?. .?.....#@?
    30: 00 80 b7 00 20 0c 81 4a a0 41 40 00 48 00 6c 00 .??. ??J?A@.H.l.
    40: 04 00 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ?.??????????????
    50: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ????????????????
    60: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ????????????????
    70: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ????????????????
    80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ????????????????
    90: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ????????????????
    a0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ????????????????
    b0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ????????????????
    c0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ????????????????
    d0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ????????????????
    e0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ????????????????
    f0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ????????????????

    Thanks

  • 0 in reply to kadam shah
    TI__Mastermind 39141 points

    Hello Kadam,

    I'm not sure how to read this register dump, can you provide it in a different format. Can you also provide your schematic?

    Best Regards,

    Christian

  • 0 in reply to Christian Moyer
    Prodigy 70 points

    Hello Christian,

    From register dump value, we understand that 0x0D register value is set to 0x34. We think that it is reason we are getting 5.19V.

    We will not be able to share schematic due to our customer property.

    Thanks

  • 0 in reply to kadam shah
    TI__Mastermind 39141 points

    Hello Kadem,

    If you increase this voltage does the output voltage increase?

    What is the battery voltage?

    Best Regards,

    Christian.

  • 0 in reply to Christian Moyer
    Prodigy 70 points

    Hello Christian,

    Thank you for assisting. Our issue is resolved. Due to our software configuration, voltage is fixed to 5.19V during dead battery condition.

    Thanks