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TWL6032 Questions

- Battery voltage (via GPADC18) and system voltage thresholds (VSYSMIN_LO, VSYSMIN_HI) are monitored.  Which pins are these monitored?  I am assuming battery voltage is CHRG_VBAT and VSYSMIN is CHRG_VSYS.

- When the system drops below VSYSMIN_LO, the fallback bit is set.  Is this state recoverable or will the system just shut down it regulators?

- How can we sync battery voltage measurement to ensure a reliable measurement at a know system current draw?

  • VBAT is measured at CHRG_VBAT and VSYS is measured at VSYS_BB pin which is a sense pin.

    2. yes this state is recoverable , if the battery keeps charging and the battery votage comes above VSYS MIN hiigh . System will try to boot up again.

    3. you can use internal GPADC channel for battery measurement.

     

  • Is there any way to change the VSYSMIN_LO register setting?

    It's EPROM default is 2.9V (with BOOT0=0) and it is not clear that we can change it. TRM says it is read only.

    Can we change it to 2.7V for example, or do we need a separate EPROM?

    We have additional series R in our system and I believe we can handle a lower instantaneous dip. Our system will monitor Vbat separately and will shut down when that reaches a steady state low threshold we set (approx 3.2V), which we will determine. We would prefer to shut down gracefully this way and not be governed by the VSYSMIN_LO threshold.

    If this is not possible, can we override system shutdown due to VSYSMIN_LO threshold (perhaps always reset the fallback bit), or some other method?

     We were expecting that we can sync measurements using GPADC_START. Correct?

  • James,

    VSYSMIN_LO is a read only register, its value can not be changed . It can only be changed by EEPROM spin. It is not possible to override this threshold . there are 2 VSYSMIN_LO level depending upon the boot pins. you can look in to that.