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Original question:

BQ79616EVM-021: bq79616 evm

BQ79616EVM-021: OTUT_THRESH setting of BQ79616 IC

GAYATHRI S
Prodigy 10 points
Part Number: BQ79616EVM-021
Other Parts Discussed in Thread: BQ79616

I have followed the steps mentioned in TI AFE (BQ79616) datasheet, based on that I implemented the code to figure out the OTUT fault, OTUT fault is determined by the ratio of GPIO voltage and supply TSREF voltage. My concern is about setting OTUT threshold, since it is given in percentage and also in range, it is bit confusing to conclude in order to set the required percentage. If someone explained me the temperature and percentage relationship here, I will be grateful. I set it to given default byte, when I blew hot air using blower, AFE is detecting temperature fault. So that is fine. My concern is about, If i want to set over temperature as 50 c and under temperature as -10c or -20c, What byte I have to send? Thanks in Advance.

  • 0
    TI__Expert 7000 points

    Hello Gayathri,
    Please refer to this register. You can configure the OT and UT thresholds by setting these registers. 
    UT_THR = 000 = 66% of TSREF or 3.3V. UT_THR = 001 = 68% of TSREF or 3.4V, so on and so forth
    OT_THR = 00000 = 10% of TSREF or 0.5V. OT_THR = 00001 = 11% of TSREF of 0.55V, so on and so forth.

    Please use this to determine the appropriate OT and UT thresholds.

    Best,

         Quentin