Detecting circuit and configuration status detecting method of real-time clock battery and electronic apparatus using the same

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.

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.

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.