• State TI Thinks Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 1 answer
  • Subscribers 63 subscribers
  • Views 313 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

BQ28Z610: BQ28Z610 sleep mode query

Star Xu
Genius 9645 points
Part Number: BQ28Z610
Other Parts Discussed in Thread: BQ40Z50-R2

Hi

The values ​​of dsg relax time/chg relax time are both 1, and the time of protection and recovery is normal even with communication.

Once the communication is disconnected, the chip enters the sleep state and measures again. When the OCD recovery time is set to 5S, the measured recovery time is 27.5S. When it is set to 10S, the measured recovery time is 42.5S.

Although SLEEP is set to 0 in the DA configuration, it can be solved temporarily after turning off the sleep mode, but the resulting power consumption cannot be avoided.

How to solve it?

Under the same setting conditions, the chip bq40z50-R2 will not changes in the protection delay and recovery time in the Sleep mode.

Waiting for your reply.

Thanks

Star

  • 0
    TI__Mastermind 27321 points

    Hello Star,

    Conditions to enter and exit Sleep Mode:


    Note: The device does not perform any protections during SLEEP mode. It will transition to NORMAL mode after the conditions have been met, and then perform the OCD protection if qualifies. In seep mode, the DSG is OFF and the CHG is OFF if DA Configuration[SLEEPCHG] = 0.

    Once the device is in SLEEP mode, it will wake up every Sleep:Voltage Time period to measure voltage and temperature and  every Sleep:Current Time period to measure current. Check the settings for these two parameters. 

    By default:


    Regards,
    Jose Couso

  • 0 in reply to Jose Couso
    TI__Genius 9645 points

    Hi Jose

    Thanks for your reply.

    When both CMOS and DMOS are on in sleep mode, the voltage difference of the sense resistor exceed the 0.625mV and immediately exit sleep mode.

    Do I understand correctly？

    Thanks

    Star

  • 0 in reply to Star Xu
    TI__Mastermind 27321 points

    Hi Star,

    The CHG FET should remain ON during sleep mode for current to be sensed in the sense resistor. Make sure SLEEPCHG is set (see below). This will allow charging current to flow during Sleep mode.



    As stated in the above picture, two of the conditions for the gauge to exit sleep mode is:

    1- if the current() (sensed) > sleep current threshold

    2- if  wake comparator activates. 

    I believe you are referring to the wake comparator option. If so, correct. The device will wake up if the voltage across the SRP and SRN pins exceed +/- 0.625 mV when Power: Wake Comparator is set to WK1:WK0 [00]



    Regards,
    Jose Couso