| 摘要 |
A real time clock driving circuit for driving a real time clock includes a power source, a flash driving circuit, a switch circuit, and an electronic source. The flash driving circuit includes a booster, a charging capacitor, and a number of first resistor dividers. The anode of the charging capacitor and the first resistor dividers are coupled to an output of the booster. A node is defined between the at least one resistor divider defined. The switch circuit includes a MOS transistor and a second resistor divider. The source of the MOS transistor is coupled to the node. The gate is coupled to the node via the second resistor divider. The drain is coupled to the power input of the real time clock. The power source is coupled to the input of the booster, the gate, and the power input of the real time clock.
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