US 7,023,352 B2 · Voltage-detecting method and related circuits

Abstract

A voltage-detecting circuit includes a CPU, a comparator, a first resistor, a second resistor, and at least a power level segment detector connected in parallel with the first resistor, the power level segment detector having a third resistor and a first switch serially connected to the third resistor. The battery is electrically connected to a first input end of the comparator. The first resistor is electrically connected between a second input end of the comparator and a reference voltage. The second resistor is electrically connected between the second input end of the comparator and ground. The method includes outputting a control signal with the CPU to control the first switch by determining voltage levels at the output end of the comparator, and outputting a power indication signal with the CPU to indicate the voltage level of the battery by determining voltage levels at the output end of the comparator.

Claims20

Dependent claims

A voltage-detecting method for detecting power status of a battery with a voltage-detecting circuit, the voltage-detecting circuit comprising:

a processor comprising a first general purpose input/output (GPIO) port and a second GPIO port;
a comparator having a first input end connected to the battery, a second input end, and an output end connected to the first GPIO port;
a first resistor connected between the second input end of the comparator and a first voltage source;
a first power segment detection circuit connected in parallel with the first resistor, the first power segment detection circuit comprising a third resistor and a first switch serially connected to the third resistor, the first switch connected to the second GPIO port;
and
a second resistor connected between the second input end of the comparator and a second voltage source;
the voltage-detecting method comprising:
outputting a first control signal with the processor to control the first switch at the second GPIO port by determining a voltage level at the first GPIO port;
and
outputting a power signal with the processor by determining a voltage level at the first GPIO port.

7 more elements

Dependencies are inferred from the claim text.

Voltage-detecting method and related circuits

Life of this patent

Voltage-detecting method and related circuits

Life of this patent

Abstract

Claims20