Method of and device for detecting cable connection

• US 20020156949A1
• Filed: 10/09/2001
• Published: 10/24/2002
• Est. Priority Date: 04/19/2001
• Status: Active Grant

• Current Assignee: Renesas Electronics Corporation
• Original Assignee: Renesas Design Corp. (Hitachi, Ltd.)
• Inventors: Tanaka, Wataru, Maemura, Hiroyuki, Kubo, Kenji
• Granted Patent: US 7,082,545 B2
• Time in Patent Office: Days
• US Class Current: 710/72
• CPC Class Codes: G06F 1/266 Arrangements to supply power to external peripherals either directly from the computer or under computer control, e.g. supply of power through the communication port, computer controlled power-strips
• CPC Class Codes: G06F 13/4072 Drivers or receivers G06F13/4086 takes precedence; for multistate logic circuits H03K19/0002
• CPC Class Codes: G06F 13/4081 Live connection to bus, e.g. hot-plugging current or voltage limitation during live insertion H02H9/004
• CPC Class Codes: G06F 13/4282 on a serial bus, e.g. I2C bus, SPI bus on daisy chain buses G06F13/4247
• CPC Class Codes: Y02D 10/00 Energy efficient computing, e.g. low power processors, power management or thermal management

Abstract

The detector includes the plug for connecting the personal computer through a cable, battery power supply which provides a constant power supply, and the MCU which receives a specific potential from the personal computer when the later is connected.

Claims

1. A detector for detecting a wire connection with a personal computer, the detector comprising:

a plug for connecting the detector to the personal computer through a cable;

a battery power supply which outputs a predetermined constant electrical potential; and

a Micro Control Unit which receives a specific electrical potential from the personal computer through the plug and cable, and receives the constant electrical potential from the battery power supply.

2. The detector according to claim 1, wherein the Micro Control Unit comprises:

a CPU and peripheral circuit which receives the specific electrical potential from the personal computer and the constant electrical potential from the battery power supply;

a USB function circuit which receives the specific electrical potential from the personal computer, wherein the USB function circuit is on-off controlled by the CPU and peripheral circuit; and

a detection circuit which detects a voltage level of the specific electrical potential from the personal computer and outputs an electrical potential to the CPU and peripheral circuit based on the detected voltage level.

3. The detector according to claim 1, wherein the Micro Control Unit comprises:

a CPU and peripheral circuit which receives the specific electrical potential from the personal computer and the constant electrical potential from the battery power supply;

a USB function circuit which receives the specific electrical potential from the personal computer, wherein the USB function circuit is on-off controlled by the CPU and peripheral circuit; and

an A-D converter which receives the specific electrical potential from the personal computer and the constant electrical potential from the battery power supply, receives a differential signal, and outputs an electrical potential to the CPU and peripheral circuit based the received electrical potentials and the differential signal.

4. The detector according to claim 1, wherein the Micro Control Unit comprises:

a CPU and peripheral circuit which receives the specific electrical potential from the personal computer and the constant electrical potential from the battery power supply;

a USB function circuit which receives the specific electrical potential from the personal computer, wherein the USB function circuit is on-off controlled by the CPU and peripheral circuit; and

a ring oscillator which receives the specific electrical potential from the personal computer and the constant electrical potential from the battery power supply, and outputs an electrical potential to the CPU and peripheral circuit based the received electrical potentials.

5. The detector according to claim 1, wherein the Micro Control Unit comprises:

a CPU and peripheral circuit which receives the specific electrical potential from the personal computer and the constant electrical potential from the battery power supply;

a USB function circuit which receives the specific electrical potential from the personal computer, wherein the USB function circuit is on-off controlled by the CPU and peripheral circuit; and

a comparator which receives the specific electrical potential from the personal computer and the constant electrical potential from the battery power supply, receives a differential signal, and outputs an electrical potential to the CPU and peripheral circuit based the received electrical potentials and the differential signal.

6. The detector according to claim 1, wherein the Micro Control Unit comprises:

a CPU and peripheral circuit which receives the specific electrical potential from the personal computer and the constant electrical potential from the battery power supply;

a USB function circuit which receives the specific electrical potential from the personal computer, wherein the USB function circuit is on-off controlled by the CPU and peripheral circuit; and

an inverter which receives the specific electrical potential from the personal computer and the constant electrical potential from the battery power supply, receives a differential signal, and outputs an electrical potential to the CPU and peripheral circuit based the received electrical potentials and the differential signal.

7. A detector for detecting a wire connection with a personal computer, the detector comprising:

a plug for connecting the detector to the personal computer through a cable;

a battery power supply which outputs a predetermined constant electrical potential;

an oscillator which outputs an oscillation signal; and

a Micro Control Unit which receives a specific electrical potential from the personal computer through the plug and cable, receives the constant electrical potential from the battery power supply, and receives the oscillation signal from the oscillator.

8. The detector according to claim 7, wherein the Micro Control Unit comprises:

a CPU and peripheral circuit which receives the specific electrical potential from the personal computer and the constant electrical potential from the battery power supply;

an oscillation circuit which detects a voltage level of the specific electrical potential from the personal computer, receives the oscillation signal from the oscillator, and outputs an oscillation output based on the detected voltage level and the oscillation signal; and

a counter which counts the oscillation output from the oscillation circuit and outputs a detection signal to the CPU and peripheral circuit.

9. The detector according to claim 8, wherein the Micro Control Unit comprises:

a PLL circuit which receives the oscillation output from the oscillation circuit and outputs a clock to the USB function circuit.

10. A method of detecting a wire connection with a personal computer using a detector, the detector including,

a plug for connecting the detector to the personal computer through a cable;

a battery power supply which outputs a predetermined constant electrical potential; and

a Micro Control Unit which receives a specific electrical potential from the personal computer through the plug and cable, and receives the constant electrical potential from the battery power supply, the Micro Control Unit including,

a CPU and peripheral circuit which receives the specific electrical potential from the personal computer and the constant electrical potential from the battery power supply;

a USB function circuit which receives the specific electrical potential from the personal computer, wherein the USB function circuit is on-off controlled by the CPU and peripheral circuit; and

a detection circuit which detects a voltage level of the specific electrical potential from the personal computer and outputs an electrical potential to the CPU and peripheral circuit based on the detected voltage level,

the method comprising the step of detecting, by the CPU and peripheral circuit, connection with the personal computer based on changes in the voltage level output from the detection circuit.

11. A method of detecting a wire connection with a personal computer using a detector, the detector including,

a plug for connecting the detector to the personal computer through a cable;

a battery power supply which outputs a predetermined constant electrical potential; and

a Micro Control Unit which receives a specific electrical potential from the personal computer through the plug and cable, and receives the constant electrical potential from the battery power supply, the Micro Control Unit including,

a CPU and peripheral circuit which receives the specific electrical potential from the personal computer and the constant electrical potential from the battery power supply;

a USB function circuit which receives the specific electrical potential from the personal computer, wherein the USB function circuit is on-off controlled by the CPU and peripheral circuit; and

an A-D converter which receives the specific electrical potential from the personal computer and the constant electrical potential from the battery power supply, receives a differential signal, and outputs an electrical potential to the CPU and peripheral circuit based the received electrical potentials and the differential signal,

the method comprising the step of detecting, by the A-D converter, connection with the personal computer based on the difference in the voltage level between differential signals when the personal computer is connected and when the personal computer is not connected.

12. A method of detecting a wire connection with a personal computer using a detector, the detector including,

a plug for connecting the detector to the personal computer through a cable;

a battery power supply which outputs a predetermined constant electrical potential; and

a Micro Control Unit which receives a specific electrical potential from the personal computer through the plug and cable, and receives the constant electrical potential from the battery power supply, the Micro Control Unit including,

a CPU and peripheral circuit which receives the specific electrical potential from the personal computer and the constant electrical potential from the battery power supply;

a USB function circuit which receives the specific electrical potential from the personal computer, wherein the USB function circuit is on-off controlled by the CPU and peripheral circuit; and

a ring oscillator which receives the specific electrical potential from the personal computer and the constant electrical potential from the battery power supply, and outputs an electrical potential to the CPU and peripheral circuit based the received electrical potentials,

the method comprising the step of detecting, by the CPU and peripheral circuit, connection with the personal computer based on the difference in the oscillation output of the ring oscillator between when the personal computer is connected and when the personal computer is not connected.

13. A method of detecting a wire connection with a personal computer using a detector, the detector including,

a plug for connecting the detector to the personal computer through a cable;

a battery power supply which outputs a predetermined constant electrical potential; and

a Micro Control Unit which receives a specific electrical potential from the personal computer through the plug and cable, and receives the constant electrical potential from the battery power supply, the Micro Control Unit including,

a CPU and peripheral circuit which receives the specific electrical potential from the personal computer and the constant electrical potential from the battery power supply;

a USB function circuit which receives the specific electrical potential from the personal computer, wherein the USB function circuit is on-off controlled by the CPU and peripheral circuit; and

a comparator which receives the specific electrical potential from the personal computer and the constant electrical potential from the battery power supply, receives a differential signal, and outputs an electrical potential to the CPU and peripheral circuit based the received electrical potentials and the differential signal,

the method comprising the step of detecting, by the comparator, connection with the personal computer based on a difference in the voltage level between differential signals when the personal computer is connected to the detector and when the personal computer is not connected to the detector.

14. A method of detecting a wire connection with a personal computer using a detector, the detector including,

a plug for connecting the detector to the personal computer through a cable;

a battery power supply which outputs a predetermined constant electrical potential; and

a Micro Control Unit which receives a specific electrical potential from the personal computer through the plug and cable, and receives the constant electrical potential from the battery power supply, the Micro Control Unit including,

a CPU and peripheral circuit which receives the specific electrical potential from the personal computer and the constant electrical potential from the battery power supply;

a USB function circuit which receives the specific electrical potential from the personal computer, wherein the USB function circuit is on-off controlled by the CPU and peripheral circuit; and

an inverter which receives the specific electrical potential from the personal computer and the constant electrical potential from the battery power supply, receives a differential signal, and outputs an electrical potential to the CPU and peripheral circuit based the received electrical potentials and the differential signal,

the method comprising the step of detecting, by the inverter, connection with the personal computer based on a difference in the voltage level between differential signals when the personal computer is connected to the detector and when the personal computer is not connected to the detector.

15. A method of detecting a wire connection with a personal computer using a detector, the detector including,

a plug for connecting the detector to the personal computer through a cable;

a battery power supply which outputs a predetermined constant electrical potential;

an oscillator which outputs an oscillation signal; and

a Micro Control Unit which receives a specific electrical potential from the personal computer through the plug and cable, receives the constant electrical potential from the battery power supply, and receives the oscillation signal from the oscillator, the Micro Control Unit including,

a CPU and peripheral circuit which receives the specific electrical potential from the personal computer and the constant electrical potential from the battery power supply;

an oscillation circuit which detects a voltage level of the specific electrical potential from the personal computer, receives the oscillation signal from the oscillator, and outputs an oscillation output based on the detected voltage level and the oscillation signal; and

a counter which counts the oscillation output from the oscillation circuit and outputs a detection signal to the CPU and peripheral circuit,

the method comprising the step of detecting, by the CPU and peripheral circuit, connection with the personal computer based on counting in the counter of the oscillation output from the oscillation circuit when the personal computer is connected to the detector.