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LP87702-Q1: Thermal warning - set/clear interrupt

Michal Kusmirek
Prodigy 40 points
Part Number: LP87702-Q1

Hi,

LP87702-q1 has  two selectable thresholds (125degC and 140degC) for thermal warning.

If threshold  = 140degC and PMIC reach 140degC, interrupt occur on nINT pin (logic 0).

What temperature will clear this interrupt (thermal warning) (adequate registers) ?

And the same question for threshold 125degC. What PMIC temperature will clear thermal warning registers?

Best regards

  • 0
    TI__Expert 4355 points

    Hi Michal,

    TDIE_WARN_INT is latched bit and it will require manual clearing. The interrupt will not clear itself if the temperature drops below the threshold. It can be cleared by writing 1 to it if the temperature is below the threshold.

    For real time status of the thermal warning you can use I2C to poll the TDIE_WARN_STAT bit.

    Best regards,

    Samuli Piispanen

  • 0 in reply to Samuli Piispanen
    Prodigy 40 points

    Hi Samuli,

    How we can control PMIC temperature?   TDIE_WARN_STAT can be read by i2c and this register is depended on PMIC temperature. am I right? 
    If so, for which temperature this register change state?   (for 140 and 125 threshold)

    Best regards
    MK

  • 0 in reply to Michal Kusmirek
    TI__Expert 4355 points

    Hi Michal,

    Yes, TDIE_WARN_STAT value depends on the PMIC temperature and TDIE_WARN_LEVEL setting. The temperature where TDIE_WARN_STAT goes 1 is configured with TDIE_WARN_LEVEL bit.

    Also note that there is 20C hysteresis in the thermal warning as well as some tolerance in the warning level.

    Best regards,

    Samuli Piispanen

  • 0 in reply to Samuli Piispanen
    Prodigy 40 points

    Yes, I know it.
    For threshold 140C, and temperature falling down from 140C or above to 120C, TDIE_WARN_STAT change state for 130C or lower value?

    I mean for thermal warning threshold = 140C, when temperature rising, and exceed 140C TDIE_WARN_STAT register change state from "0" to "1".
    If temperature fall down from 140C below 130C, TDIE_WARN_STAT register change state from "1" to "0". 
    Am I right? 

    Best regards
    MK
     

  • +1 in reply to Michal Kusmirek
    TI__Expert 4355 points

    Hi Michal,

    Hysteresis is 20C. TDIE_WARN_STAT will change state from 1 to 0 when the die temperature drops 20C below the set TDIE_WARN_LEVEL.

    In other words, with 140C setting (not taking the tolerance into account)

    • 0 to 1 change will happen at 140C.
    • 1 to 0 change will happen at 120C

    Best regards,

    Samuli Piispanen