JAJSSD2A October 2023 – December 2023 BQ25638
PRODUCTION DATA
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In ultra-low power mode, the BATFET is turned off to prevent the battery from powering the system. The host may place BQ25638 into ultra-low power mode by setting BATFET_CTRL = 10. ultra-low power mode has slightly higher quiescent current than shutdown mode, but QON or an I2C command may be used to exit from ultra-low power mode. The device is taken out of ultra-low power mode by either of these methods:
When the charger exits from ultra-low power mode, the registers are reset to their POR values.
Ultra-low power mode is only entered when the adapter is not present. Setting BATFET_CTRL = 10 while VVBUS > VVBUS_UVLOZ (adapter present) will either disable the BATFET or have no immediate effect depending on the setting of BATFET_CTRL_WVBUS.