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The power failure protection circuit of the single chip syst

2015-01-05 20:27  
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The power failure protection circuit of the single chip system
When the main power is normal, the signal chip machine is powered by VCC5V, at the moment, the VCC5V power supply is charging the battery through D1 and R1, by which the fullness of the battery volume can be ensured. If the right resistor R1 is chosen, then the charging current and charge time will be proper. For example, when charging 3V6 * 60mAH battery, the charge time is about 8h, then we choose the charge current as 8mA, R1=(6V-0.6)/8(0.6 is the conducting step-down of the serial diode).