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Original question:

BQ76920: Monitoring cell voltages, temperature and etc.

BQ76920: parallel monitoring of battery temperature through same NTC connected to BQ76920

Vasu Poojary
Intellectual 450 points
Part Number: BQ76920

Hello Expert,

We have a requirement to battery NTC which is connected to BQ76920 to also be parallel read by Host controller  ADC interface.

we have connected NTC to TS1 pin of BQ76920 and same is also connected to ADC of host MCU.

Expectation here is to MCU to acquire ADC in parallel .

But , we see that BQ76920 acquires temperature in 2 sec interval and it is biasing the NTC (pull up resistor is enabled ) only for <100mSec duration for acquisition.

Please let us know how to sync this data with MCU ADC channel ? is any of Alert  pin (with CC ready ) can be used as reference to acquire the temp channel also ?

thanks in advance .

regards

Vasu

  • 0
    TI__Mastermind 25880 points

    Hi Vasu,

    I don't think it will be possible to synchronize the MCU measurement and the AFE measurement well. The CC Ready signal is just for the current measurement and likely won't be synchronized with the device polling the TS1 pin. It may be easier to use a second thermistor for the MCU.

    Regards,

    Max Verboncoeur

  • 0 in reply to Max Verboncoeur
    Prodigy 10 points

    Many thanks Maxwell for the reply.

    However, the Embedded_Scheduler_in_Cell_Battery_Monitor_BQ769x0 appNote indicates that the BQ device would enable NTC biasing (& reading) on 19th tick of 12.5 ms, for every 8th ALERT trigger. This is valid for non balancing scenario.

    Can this link 8th ALERT >> 19th tick of 12.5 ms be used to synchronise temp. measurement?

  • 0 in reply to Utpal Tembe
    TI__Mastermind 25880 points

    Hi Utpal,

    It might work, but the MCU would likely need to clear the Alert each time it is asserted so that it is able to keep track of how many Alerts have occurred.

    Regards,

    Max Verboncoeur