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LOW_BATTERY_MONITOR

2016-05-09 19:02  
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LOW_BATTERY_MONITOR
This circuit gives an early warning of declining battery voltage. Then, to allow a controlling processor time for emergency housekeeping chores, such as the storage of register data, the circuit delays system shutdown by a specified time interval (rather than waiting for battery voltage to decline further, to a specified lower level). Circuit components are chosen for low quiescent current, which protects discharged cells by minimizing the battery drain during shutdown: IC1 draws 1 μA, IC2 draws 3 μA, and R1 and R2 draw 3 μA, for a total shutdown current of about 7 μA. R1 and R3=1 MΩ, R2 =280 kΩ, R4=49.9 kΩ, R5=2.4 MΩ, and C1=3.9 μF