BQ76942: Sleep Wake signal

Sean Chan1

Prodigy 150 points

Part Number: BQ76942

Hi Matt,

Thank you for your help.

So the Sleep current is an absolute value, right?

If I want to wake up MCU by alert signal, should I set WAKE bit in ALARM ENABLE high?

over 4 years ago

+1 Matt Sunna over 4 years ago

TI__Guru* 81034 points

Hi Sean,

This bit will cause the Alert pin to assert when the BQ76942 wakes from Shutdown mode. However, in Shutdown mode, all of the registers of the BQ76942 are reset to the defaults unless you program different settings in OTP. So by default, the ALERT pin is not configured.

Best regards,

Matt

0 Sean Chan1 over 4 years ago in reply to Matt Sunna

Prodigy 150 points

Hi Matt,

Thank you.

If I want to inform MCU that there is discharge or charge event happen how to use Alert?

0 Matt Sunna over 4 years ago in reply to Sean Chan1

TI__Guru* 81034 points

Hi Sean,

The Alert pin cannot be used to indicate charging or discharging. The MCU can read the current every 3ms (or every 1.5ms in FASTADC mode) to see the magnitude and direction of the current.

Best regards,

Matt

Power management

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BQ76942: Sleep Wake signal