Detecting circuit and configuration status detecting method of real-time clock battery and electronic apparatus using the same
A detecting circuit and a configuration status detecting method of a Real-Time Clock (RTC) battery and an electronic apparatus using the same are provided. The detecting circuit includes a power capturing unit, a voltage dividing unit and an output unit. The power capturing unit couples to a power supply output terminal of the RTC battery and captures a power supply signal from the power supply output terminal in response to a detecting-controlled signal. The voltage dividing unit couples to the power capturing unit and is configured to divide the power supply signal captured by the power capturing unit to generate a dividing signal. The output unit couples to the voltage dividing unit to receive the dividing signal, where the output unit generates a detecting result signal related to a configuration status of the RTC battery according to the dividing signal.
1. A detecting circuit of a Real-Time Clock (RTC) battery, comprising:
a power capturing unit coupled to a power supply output terminal of the RTC battery, receiving a detecting-controlled signal and capturing a power supply signal from the power supply output terminal in response to the detecting-controlled signal, wherein the power capturing unit provides the power supply signal when the detecting-controlled signal having high level, and the power capturing unit stops to provide the power supply signal when the detecting-controlled signal having low level;
a voltage dividing unit coupled to the power capturing unit and configured to divide the power supply signal captured by the power capturing unit to generate a dividing signal; and
an output unit coupled to the voltage dividing unit to receive the dividing signal, wherein the output unit generates a detecting result signal related to a configuration status of the RTC battery according to the dividing signal,
wherein the voltage dividing unit comprises:
a first resistor, a first terminal thereof coupled to the power capturing unit; and
a second resistor, a first terminal thereof coupled to a second terminal of the first resistor, and a second terminal thereof is coupled to a ground terminal,
wherein the output unit comprise:
a first bias source;
a first bias resistor, a first terminal thereof coupled to the first bias source; and
a first transistor, a control terminal thereof coupled to the second terminal of the first resistor and the first terminal of the second resistor, a first terminal thereof coupled to a second terminal of the first bias resistor and outputting the detecting result signal, and a second terminal thereof coupled to the ground terminal,
wherein the power capturing unit comprises:
a second transistor, a control terminal thereof receiving the detecting-controlled signal, a first terminal thereof coupled to the power supply output terminal to receive the power supply signal, and a second terminal thereof coupled to the first terminal of the first resistor.
2. The detecting circuit of the RTC battery as recited in claim 1 , wherein:
if the level of the dividing signal is greater than or equal to a threshold, the output unit outputs the enabled detecting result signal in response to the dividing signal, wherein the enabled detecting result signal indicates that the RTC battery is in a normal configuration state; and
if the level of the dividing signal is smaller than the threshold, the output unit outputs the disabled detecting result signal in response to the dividing signal, wherein the disabled detecting result signal indicates that the RTC battery is in an abnormal configuration state.
3. The detecting circuit of the RTC battery as recited in claim 1 , wherein the power supply output terminal of the RTC battery is adapted to be coupled to a Schottky diode, so as to supply power to at least one electronic component via the Schottky diode.
4. An electronic apparatus, comprising:
at least one electronic component;
a battery module adapted to supply power to the at least one electronic component, wherein the battery module comprises:
a Real-Time Clock battery (RTC) having a power supply output terminal; and
a Schottky diode coupled between the power supply output terminal and the at least one electronic component;
a detecting circuit coupled to the battery module, wherein the detecting circuit comprises:
a power capturing unit coupled to a power supply output terminal of the RTC battery, receiving a detecting-controlled signal and capturing a power supply signal from the power supply output terminal in response to the detecting-controlled signal, wherein the power capturing unit provides the power supply signal when the detecting-controlled signal having high level, and the power capturing unit stops to provide the power supply signal when the detecting-controlled signal having low level;
a voltage dividing unit coupled to the power capturing unit and configured to divide the power supply signal captured by the power capturing unit to generate a dividing signal; and
an output unit coupled to the voltage dividing unit to receive the dividing signal, wherein the output unit generate a detecting result signal according to the dividing signal; and
a controller configured to provide the detecting-controlled signal for controlling the operation of the detecting circuit and to receive the detecting result signal for determining a configuration status of the RTC battery,
wherein the voltage dividing unit comprises:
a first resistor, a first terminal thereof coupled to the power capturing unit; and
a second resistor, a first terminal thereof coupled to a second terminal of the first resistor, and a second terminal thereof is coupled to a ground terminal,
wherein the output unit comprises:
a first bias source; and
a first transistor, a control terminal thereof coupled to the second terminal of the first resistor and the of the first terminal of the second resistor, a first terminal thereof coupled to the first bias source and outputting the detecting result signal, and a second terminal thereof coupled to the ground terminal,
wherein the power capturing unit comprises:
a second transistor, a control terminal receiving the detecting-controlled signal, a first terminal thereof coupled to the power supply output terminal to receive the power supply signal, and a second terminal thereof coupled to the first terminal of the first resistor.
5. The electronic apparatus as recited in claim 4 , wherein the Schottky diode has a first anode terminal, a second anode terminal and a cathode terminal, the first anode terminal couples to an auxiliary bias source, the second anode terminal couples to the power supply output terminal, and the cathode terminal couples to the at least one electronic component.
6. The electronic apparatus as recited in claim 4 , wherein:
if the level of the dividing signal is greater than or equal to a threshold, the output unit outputs the enabled detecting result signal in response to the dividing signal, wherein the controller determines that the RTC battery is in a normal configuration state according to the enabled detecting result signal; and
if the level of the dividing signal is smaller than the threshold, the output unit outputs the disabled detecting result signal in response to the dividing signal, wherein the controller determines that the RTC battery is in an abnormal configuration state according to the disabled detecting result signal.
7. A detecting circuit of a Real-Time Clock (RTC) battery, comprising:
a power capturing unit coupled to a power supply output terminal of the RTC battery, receiving a detecting-controlled signal and capturing a power supply signal from the power supply output terminal in response to the detecting-controlled signal, wherein the power capturing unit provides the power supply signal when the detecting-controlled signal having high level, and the power capturing unit stops to provide the power supply signal when the detecting-controlled signal having low level;
a voltage dividing unit coupled to the power capturing unit and configured to divide the power supply signal captured by the power capturing unit to generate a dividing signal; and
an output unit coupled to the voltage dividing unit to receive the dividing signal, wherein the output unit generates a detecting result signal related to a configuration status of the RTC battery according to the dividing signal,
wherein the voltage dividing unit comprises:
a first resistor, a first terminal thereof coupled to the power capturing unit; and
a second resistor, a first terminal thereof coupled to a second terminal of the first resistor, and a second terminal thereof is coupled to a ground terminal,
wherein the output unit comprise:
a first bias source;
a first bias resistor, a first terminal thereof coupled to the first bias source; and
a first transistor, a control terminal thereof coupled to the second terminal of the first resistor and the first terminal of the second resistor, a first terminal thereof coupled to a second terminal of the first bias resistor and outputting the detecting result signal, and a second terminal thereof coupled to the ground terminal,
wherein the power capturing unit comprises:
a second bias source;
a second bias resistor, a first terminal thereof coupled to the second bias source;
a second transistor, a control terminal thereof coupled to the second terminal of the second bias resistor, a first terminal thereof coupled to the power supply output terminal to receive the power supply signal, and a second terminal thereof coupled to the first terminal of the first resistor; and
a third transistor, a control terminal thereof receiving the detecting-controlled signal, a first terminal thereof coupled to the second terminal of the second bias resistor and the control terminal of the second transistor, and a second terminal thereof coupled to the ground terminal.
8. An electronic apparatus, comprising:
at least one electronic component;
a battery module adapted to supply power to the at least one electronic component, wherein the battery module comprises:
a Real-Time Clock battery (RTC) having a power supply output terminal; and
a Schottky diode coupled between the power supply output terminal and the at least one electronic component;
a detecting circuit coupled to the battery module, wherein the detecting circuit comprises:
a power capturing unit coupled to a power supply output terminal of the RTC battery, receiving a detecting-controlled signal and capturing a power supply signal from the power supply output terminal in response to the detecting-controlled signal, wherein the power capturing unit provides the power supply signal when the detecting-controlled signal having high level, and the power capturing unit stops to provide the power supply signal when the detecting-controlled signal having low level;
a voltage dividing unit coupled to the power capturing unit and configured to divide the power supply signal captured by the power capturing unit to generate a dividing signal; and
an output unit coupled to the voltage dividing unit to receive the dividing signal, wherein the output unit generate a detecting result signal according to the dividing signal; and
a controller configured to provide the detecting-controlled signal for controlling the operation of the detecting circuit and to receive the detecting result signal for determining a configuration status of the RTC battery,
wherein the voltage dividing unit comprises:
a first resistor, a first terminal thereof coupled to the power capturing unit; and
a second resistor, a first terminal thereof coupled to a second terminal of the first resistor, and a second terminal thereof is coupled to a ground terminal,
wherein the output unit comprises:
a first bias source;
a first bias resistor, a first terminal thereof coupled to the first bias source; and
a first transistor, a control terminal thereof coupled to the second terminal of the first resistor and the first terminal of the second resistor, a first terminal thereof coupled to a second terminal of the first bias resistor and outputting the detecting result signal, and a second terminal thereof coupled to the ground terminal,
wherein the power capturing unit comprises:
a second bias source;
a second bias resistor, a first terminal thereof coupled to the second bias source;
a second transistor, a control terminal thereof coupled to a second terminal of the second bias resistor, a first terminal thereof coupled to the power supply output terminal to receive the power supply signal, and a second terminal thereof coupled to the first terminal of the first resistor; and
a third transistor, a control terminal thereof receiving the detecting-controlled signal, a first terminal thereof coupled to the second terminal of the second bias resistor and the control terminal of the second transistor, and a second terminal thereof coupled to the ground terminal.