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BQ40Z50-R2: In BQ40Z50-R2, What happens when NR=1 and PRES=0?

uday kumar reddy
Intellectual 600 points
Part Number: BQ40Z50-R2


Hi all,

We are using BQ40Z50-R2 for one of our application. In our system We are making the NR bit to high for non-removable (settings-->DA configuration:NR=1). And as per our system configuration The PRES pin of the BQ40z50-R2 is becoming low. The moment PRES pin becomes low, the bit OperationStatus()[EMSHUT]  becoming high and system is going to shutdown.

The data sheet mentioned "If the [NR] bit is set, the PRES input is ignored and can be left floating"

my question is When NR=1 , and PRES pin connected to ground (=0) what is the behavior? Please let us weather we can connect it to Ground when NR=1?

Thank you for your valuable time,

Regards 

Uday kumar

  • 0
    TI__Mastermind 25955 points
    Hi Uday,

    If [NR] = 1 and DA Configuration[EMSHUT] = 1, a high to low transition on the SHUTDN pin (PRES pin when NR = 1) with sufficient debounce delay will cause the gauge to turn off the CHG and DSG FETs immediately.

    To disable this functionality, please either float the PRES pin, or set DA Configuration[EMSHUT] = 0.

    For more information, please refer to section 5.6.1 of the TRM found here: www.ti.com/.../sluubk0a.pdf

    If the above discussion helped resolve your issue, please click on the "This resolved my Issue" button below to help others with a similar question find this answer.

    Sincerely,
    Bryan Kahler
  • 0 in reply to Bryan Kahler
    Intellectual 600 points
    Hi Bryan Kahler,

    Thank you very much for your information.

    Regards
    Uday kumar