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BQ25185: DS question

Ryo Jomori
Prodigy 360 points
Part Number: BQ25185
Other Parts Discussed in Thread: SN74LVC1G08, SN74LVC1G126

Tool/software:

Hello Team,

1.  I suppose charging may stop when a Hi-level voltage is input to /CE, but will STAT2 (terminal indicating charging status) also become Hi too?

2. I recognize the fault detection reported by STAT1 and  STAT2 is always detected except in factory mode. Is there a way to intentionally stop the notification in STAT1 and STAT2 (= a way to intentionally stop the Lo level when failure)?

Regards,

  • 0
    TI__Expert 7880 points

    Hello Ryo-san,

    Ryo Jomori said:
    1.  I suppose charging may stop when a Hi-level voltage is input to /CE, but will STAT2 (terminal indicating charging status) also become Hi too?

    Yes, when charging is disabled by pulling /CE HIGH, both STAT1 and STAT2 will be HIGH.

    Ryo Jomori said:
    2. I recognize the fault detection reported by STAT1 and  STAT2 is always detected except in factory mode. Is there a way to intentionally stop the notification in STAT1 and STAT2 (= a way to intentionally stop the Lo level when failure)?

    STAT1 and STAT2 are open-drain outputs, and there's no way to internally disable them on the BQ25185.

    If I understand correctly, you only want to see the status when STAT1 is HIGH, and interpret STAT2 as either LOW (charging in progress) or HIGH (charging complete)?

    In that case, you could use either an AND gate (SN74LVC1G08) or a tri-state buffer (SN74LVC1G126) to drive an LED when STAT1 is HIGH.

    Please feel free to let me know if you have any questions.

    Best regards,

    Alec

  • 0 in reply to Alec Lehman
    TI__Prodigy 360 points

    Thank you Alec,

    Additional question on #1.

    Q) I suppose charging may stop when a Hi-level voltage is input to /CE, but will STAT2 (terminal indicating charging status) also become Hi too?

    A) Yes, when charging is disabled by pulling /CE HIGH, both STAT1 and STAT2 will be HIGH.

    New Q) In the situation of /CE=HIGH and both STAT1 and STAT2 = HIGH, will STAT1 and STAT2 be Low if charging IC defect fault?

  • 0 in reply to Ryo Jomori
    TI__Expert 7880 points

    Hello Ryo-san,

    Thanks for following up.

    Ryo Jomori said:
    New Q) In the situation of /CE=HIGH and both STAT1 and STAT2 = HIGH, will STAT1 and STAT2 be Low if charging IC defect fault?

    Yes, I confirmed this on a BQ25185 EVM. If /CE is pulled HIGH to disable charging, but a fault occurs, STAT1 will be LOW, and STAT2 will be HIGH or LOW, depending on the specific fault.

    Best regards,

    Alec