Abstract: A detection apparatus for use in a touch pad, for detecting the coordinates indicated by a user on the touch pad and the behavior of the user on the touch pad. The touch pad includes an X-layer and a Y-layer, and the X- and Y-layers are planar resistors. The detection apparatus has a sleep mode and an operative mode. When the user touches the touch pad, the X- and Y-layers are electrically coupled at a touch point. The detection apparatus includes a central processor, a coordinate detecting unit, an analog-to-digital converting unit, and a wake-up unit. The coordinate detecting unit is used to determine and output an X-coordinate voltage and a Y-coordinate voltage, wherein the X- and Y-coordinate voltages correspond to the touch point. The analog-to-digital converting unit is used to convert the X- and Y-coordinate voltages into an X-coordinate and a Y-coordinate, and to output the X- and Y-coordinate.

Abstract: A peripheral device for controlling power in a portable electronic device. The peripheral device is coupled to an output port of the portable electronic device to control voltages of a first pin and a second pin. After a period of no use, the portable electronic device enters sleep mode. After an input signal is received by the peripheral device, the portable electronic device is woken and enters work mode. The peripheral device comprises an input device controller and an interface circuit. The input device controller comprises a gate connecting port, a clock signal port, an input port and a port for detecting voltage. The interface circuit comprises a first diode, a second diode, a capacitor, a resistor and a PNP transistor.

Abstract: A peripheral device for controlling power in a portable electronic device. The peripheral device is coupled to an output port of the portable electronic device to control voltages of a first pin and a second pin. After a period of no use, the portable electronic device enters sleep mode. After an input signal is received by the peripheral device, the portable electronic device is woken and enters work mode. The peripheral device comprises an input device controller and an interface circuit. The input device controller comprises a gate connecting port, a clock signal port, an input port and a port for detecting voltage The interface circuit comprises a first diode, a second diode, a capacitor, a resistor and a PNP transistor.

Abstract: A key-pressing circuit has a control unit, a first charge storage circuit, and a key matrix circuit. The control unit has a controlling port and a detecting port, and the controlling port can be in either a grounded state or a floating state. The first charge storage circuit has a charging port that connects to the detecting port of the control unit. The key matrix circuit has a plurality of resistors and an associated plurality of switches. The resistors are connected together in series, forming a series resistor circuit that has a first end and a second end. One end of each switch connects to an end of its associated resistor. The other end of each switch connects to the controlling port of the control unit. The first end of the series resistor circuit connects to the charging port of the first charge storage circuit. The detecting port detects if the charging port of the first charge storage circuit reaches a predetermined voltage.

Abstract: A low-voltage detecting circuit for power sources is based upon the relation of the discharge time of a capacitor and the measured voltage value to determine whether the voltage level of the power source is too low. The voltage detecting circuit comprises a charge/discharge module and a discharge detecting module, wherein one terminal of said charge/discharge module is connected to the voltage to be measured. The discharge time of capacitor depends on the voltage to be measured. In other words, the voltage to be measured can be detected by calculating the discharge time of capacitor. Furthermore, the present invention provides a simplified circuit so as to reduce the fabrication cost.

Abstract: A detection apparatus for use in a touch pad, for detecting the coordinates indicated by a user on the touch pad and the behavior of the user on the touch pad. The touch pad includes an X-layer and a Y-layer, and the X- and Y-layers are planar resistors. The detection apparatus has a sleep mode and an operative mode. When the user touches the touch pad, the X- and Y-layers are electrically coupled at a touch point. The detection apparatus includes a central processor, a coordinate detecting unit, an analog-to-digital converting unit, and a wake-up unit. The coordinate detecting unit is used to determine and output an X-coordinate voltage and a Y-coordinate voltage, wherein the X- and Y-coordinate voltages correspond to the touch point. The analog-to-digital converting unit is used to convert the X- and Y-coordinate voltages into an X-coordinate and a Y-coordinate, and to output the X and Y-coordinate.