SPMU383 April 2026 BQ27Z846
The device provides an option to enter SLEEP mode in-system. When the DA Config[IN_SYSTEM_SLEEP] = 1, the device will turn off CHG FET and PCHG FET if FET Options[SLEEPCHG] = 0 and enter SLEEP mode. In this option, the SMBus low state is not a condition to enter SLEEP mode (instead, communication must not occur for Bus Timeout to enter SLEEP). All the other sleep conditions must be met for the device to enter SLEEP mode.
Setting the Bus Timeout = 0 with [IN_SYSTEM_SLEEP] can be used for testing purposes, but it is not recommended to set the Bus Timeout = 0 in the field. If Bus Timeout = 0, the device's sleep and wake conditions are strictly controlled by current detection. If the host system performs a low load operation periodically (for example, wireless detection in a tablet application), this small load current may be missed, introducing an error into remaining capacity tracking. Having a non-zero Bus Timeout setting enables the gauge to wake up by a communication and capture the current measurement.