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BQ76952: Periodic time based interrupt through AFE Alert pin

Sourabh Patil
Prodigy 55 points
Part Number: BQ76952

Tool/software:

HI team,

We want to know if there exists any feature in Bq76952 wherein the AFE can periodically interrupt/wakeup via Alert pin or any other mechanism to the host processor after some configured time ?

  • 0
    TI__Genius 17815 points

    Hello Sourabh,

    There isn’t a specific feature in the AFE via the Alert pin, however, there are potentially some workarounds to achieve what you’re asking.

    1. One potential method is to use the Host Watchdog Protection (HWD) that triggers a fault that the ALERT pin can use to interrupt through Safety Status C(). HWD occurs when no communications are received for a programmable delay HWD_DELAY. You can program the delay from 0-sec to 65535-sec in 1-sec steps.

    Usually when HWD is triggered, it will turn OFF the DSG FET and the CHG FET as well as potentially disable/toggle the REG1 and REG2 LDOs. You would want to disable these affects when the fault is triggered unless it is desired. This is given in more detail in Section 5.2.16 Host Watchdog Protection of the technical reference manual (TRM).

    2. Another potential method, that can only be used in SLEEP mode, is to adjust the ADSCAN/FULLSCAN measurement timings as desired so that once they are completed in the desired time, it will trigger an interrupt through the ALERT pin.

    ADSCAN sets when a single ADC scan is complete and FULLSCAN sets when a full set of measurements is completed (this could take up 3 loops to complete). This speed of the measurement loops can be controlled through Power:Sleep:Voltage Time from an interval of 1sec to 255sec.

    Figure 3. SLEEP Mode Measurement Loop in the Improving Voltage Measurement Accuracy in Battery Monitoring Systems app note shows how the measurement loop is done during SLEEP mode. Section 10.1.1 Voltage Measurement Schedule in the datasheet explains the measurement schedule in general a bit more.

    Best Regards,
    Alexis