LOW-POWER BATTERY MONITORING WITH SAFETY SYSTEM

摘要

A method for monitoring a charge of a battery in a device, comprising providing a low power processor having a wake state and a dormant state, the low power processor configured to periodically change from the dormant state to the wake state. The method further comprises periodically enabling a battery monitor circuit to determine the charge of the battery, the low power processor enabling the battery monitor circuit when the low power processor is in the wake state. The battery monitor circuit has a default safe state in which a digital processor enables the battery monitor circuit and a normal operating state in which the low power processor periodically enables the battery monitor circuit, the battery monitor circuit switching from the default safe state to the normal operating state when the low power processor is detected. The digital processor is different than the low power processor.