Voltage detecting circuit
First Claim
1. A voltage detecting circuit for detecting a voltage range of a power source, said voltage detecting circuit comprising:
- a micro controlling unit comprising a general input/output port for issuing a digital level signal to said micro controlling unit and a controlling input/output port for outputting a constant voltage; and
a boost circuit electrically connected to said power source and said micro controlling unit for providing said constant voltage to said micro controlling unit;
a first divider resistor electrically connected to said micro controlling unit, said power source and said boost circuit; and
a second divider resistor connected to said first divider resistor in series and electrically connected to said controlling input/output port of said micro controlling unit, wherein a judgment voltage is obtained according to said first divider resistor, said second divider resistor, said constant voltage and a voltage of said power source, said digital level signal is issued by said general input/output port according to said judgment voltage, said voltage range of said power source is determined by said micro controlling unit according to a logic-level of said digital level signal, and an enabling signal is generated by said micro controlling unit in response to said digital level signal.
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Accused Products
Abstract
The present invention relates to a voltage detecting circuit for detecting a voltage range of a power source. The voltage detecting circuit includes a micro controlling unit, a boost circuit and a plurality of divider resistors. The micro controlling unit includes a general input/output port and a controlling input/output port. The boost circuit provides a constant voltage. A judgment voltage is obtained according to the divider resistors, the constant voltage and a voltage of the power source. A digital level signal is issued by the general input/output port according to the judgment voltage. In response to the digital level signal, the micro controlling unit generates a corresponding prompt associated with the voltage status of the power source.
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Citations
13 Claims
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1. A voltage detecting circuit for detecting a voltage range of a power source, said voltage detecting circuit comprising:
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a micro controlling unit comprising a general input/output port for issuing a digital level signal to said micro controlling unit and a controlling input/output port for outputting a constant voltage; and a boost circuit electrically connected to said power source and said micro controlling unit for providing said constant voltage to said micro controlling unit; a first divider resistor electrically connected to said micro controlling unit, said power source and said boost circuit; and a second divider resistor connected to said first divider resistor in series and electrically connected to said controlling input/output port of said micro controlling unit, wherein a judgment voltage is obtained according to said first divider resistor, said second divider resistor, said constant voltage and a voltage of said power source, said digital level signal is issued by said general input/output port according to said judgment voltage, said voltage range of said power source is determined by said micro controlling unit according to a logic-level of said digital level signal, and an enabling signal is generated by said micro controlling unit in response to said digital level signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification