• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 64 subscribers
  • Views 422 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.

BQ76952: BQ76952 SLEEP Mode

Makoto Oka
Prodigy 320 points
Part Number: BQ76952

Tool/software:

Hi,

Could you please answer to following 4 questions?

(1) when operating in SLEEP mode, is it correct that the following operations are possible?
・ C-FET/D-FET on
・MCU power is supplied from AFE REG1
・Current protection (comparator operation) is enabled
・Interrupt notification to the MCU during current wake detector operation

(2) the current consumption of I sleep_1 is 41uA in the data sheet.
What is the current consumption when REG1=3.3 V and CHG=on?

=> Periodic protection and monitoring, no pack current, REG1 = 3.3V, REG2 = off,
CHG = on, DSG = on in 11V overdrive mode, No communication, Power:Sleep:Voltage Time = 5s

(3) is it correct to think that the current wake detector is always running regardless of the Power:Sleep:Voltage Time setting?

(4) when the current sense resistor is 0.5m Ω, is there any problem with setting value of Power:Sleep:Wake Comparator current as 500mA?

  • 0
    TI__Mastermind 25880 points

    Hi Makoto,

    Makoto Oka said:
    when operating in SLEEP mode, is it correct that the following operations are possible?
    ・ C-FET/D-FET on

    Yes, by correctly configuring FET Options.

    Makoto Oka said:
    ・MCU power is supplied from AFE REG1

    Yes, both REGs stay enabled in sleep mode.

    Makoto Oka said:
    ・Current protection (comparator operation) is enabled

    Yes, protections are enabled in sleep mode.

    Makoto Oka said:
    ・Interrupt notification to the MCU during current wake detector operation

    Yes, via the ALERT pin and the WAKE alarm.

    Makoto Oka said:
    the current consumption of I sleep_1 is 41uA in the data sheet.
    What is the current consumption when REG1=3.3 V and CHG=on?

    This is not characterized because the supply current of the device is extremely system specific. We chose two common configurations to provide specs for and give an idea of what the supply current will be close to, however it would be a difficult task to characterize every possible combination of settings and systems.

    Makoto Oka said:
    is it correct to think that the current wake detector is always running regardless of the Power:Sleep:Voltage Time setting?

    Yes, see below from the TRM:

    Makoto Oka said:
    when the current sense resistor is 0.5m Ω, is there any problem with setting value of Power:Sleep:Wake Comparator current as 500mA?

    No. This setting uses the calculated value in mA, so as long as CC Gain and Capacity Gain are correctly set for the sense resistance, then 500mA will always mean 500mA.

    Regards,

    Max Verboncoeur