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BQ25720: PROCHOT for VSYS when low power mode

Hardy Xue
Expert 3640 points
Part Number: BQ25720
Other Parts Discussed in Thread: BQ25710,

Hi Team,

We have a question for PROCHOT behavior when low power mode as blew datasheet shown.

This PROCHOT function is used to monitor system voltage whether VSYS is lower than specific value like a under voltage alert.

We need to use resistor divider for CMPIN to set normal VSYS is higher than 1.2V. But the #PROCHOT will be trigger from high to low when VSYS at normal voltage range. 

Could you please help to comment this behavior? Thanks. 

Also, I checked the BQ25710 datasheet for this #PROCHOT behavior. It does not include a NOT gate after independent comparator. Are BQ25720 and BQ25710 with same behavior?

Best regards,

Hardy

  • 0
    TI__Genius 11385 points

    Hi Hardy,

    You can use CMP_POL bit to decide how /PROCHOT react when it is above 1.2 V. When CMP_POL = '1', /PROCHOT will be high impedance (high) when CMPIN is above 1.2V.

    The same applies for BQ25710 and you need to set CMP_POL = '1'.

    Thanks and I hope this helps,

    Peng

    *Please press "This Resolved My Issue" on the thread if my answer is satisfactory

  • 0 in reply to Pengzhao Zhu
    TI__Expert 3640 points

    Hi Peng,

    Thanks for your reply.

    The 0x30[6] CMP_POL setting is for CMPOUT in datasheet. Do you mean that #PROCHOT and CMPOUT will have same behavior?

    Best regards,

    Hardy

  • 0 in reply to Hardy Xue
    TI__Genius 11385 points

    Hi Hardy,

    It will do the job if you use the CMP_POL bit. I have tested it before. You can try it on the EVM if you like.

    Thanks and I hope this helps,

    Peng

    *Please press "This Resolved My Issue" on the thread if my answer is satisfactory