Portable electronic device and voltage converting circuit thereof

• US 9,552,028 B2
• Filed: 10/18/2012
• Issued: 01/24/2017
• Est. Priority Date: 12/30/2011
• Status: Active Grant

• Current Assignee: Chi Mei Communication Systems Incorporated (Hon Hai Precision Industry Co., Ltd.), Shenzhen Futaihong Precision Industrial Company Limited (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Chi Mei Communication Systems Incorporated (Hon Hai Precision Industry Co., Ltd.), Shenzhen Futaihong Precision Industrial Company Limited (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Wu, Hai-Zhou
• Primary Examiner(s): Barnie, Rexford
• Assistant Examiner(s): Ly, Xuan
• Application Number:
  US13/655,404
• Publication Number:
  US 20130169043A1
• Time in Patent Office: 1,559 Days
• Field of Search: 307/18, 381/74
• US Class Current: 1/1
• CPC Class Codes: G06F 1/26 Power supply means, e.g. regulation thereof for memories G11C

Abstract

A portable electronic device includes a battery, a central processing unit (CPU), and voltage converting circuit. The battery includes an erasable programmable read-only memory (EPROM) and a signal terminal connected to the EPROM. The CPU includes a read/write control terminal. The voltage converting circuit includes a first power terminal connected to a first power supply, a second power terminal connected to a second power supply, a first port connected to the read/write control terminal through a 1-wire bus, and a second port connected to the signal terminal.

Claims

1. A voltage converting circuit, comprising:

a voltage converting chip comprising;

a first port connected to a read/write control terminal of a central processing unit (CPU) through a 1-wire bus;

a second port connected to a signal terminal of a battery through a 1-wire bus, the battery comprising an erasable programmable read-only memory (EPROM) connected to the signal terminal of the battery;

a first power terminal connected to a first power supply that provides a first voltage about equal to a working voltage of the CPU;

a second power terminal connected to a second power supply that provides a second voltage about equal to a working voltage of the EPROM; and

an output enable terminal electronically connected to the first power supply, so that the voltage converting chip is always in a working state;

wherein when the CPU executes a read operation to the EPROM, the voltage converting chip converts a voltage of a signal output by the signal terminal into a voltage that can be identified by the CPU, and when the CPU executes a write operation to the EPROM, the voltage converting chip converts a voltage of a signal output by the CPU into a voltage that can be identified by the EPROM.

2. The voltage converting circuit of claim 1, wherein the first power supply is integrated with a system power that provides the first voltage to the first power terminal.

3. The voltage converting circuit of claim 1, wherein the second power supply is integrated with a power supply of the EPROM that provides the second voltage to the second power terminal.

4. The voltage converting circuit of claim 1, wherein the first port is connected to the first power supply through a first pull-up resistor.

5. The voltage converting circuit of claim 1, wherein the second port is connected to the second power supply through a second pull-up resistor.

6. A portable electronic device, comprising:

a battery comprising an erasable programmable read-only memory (EPROM) and a signal terminal connected to the EPROM;

a central processing unit (CPU) comprising a read/write control terminal; and

a voltage converting circuit, comprising;

a voltage converting chip comprising;

a first port connected to the read/write control terminal through a 1-wire bus;

a second port connected to the signal terminal through a 1-wire bus;

a first power terminal connected to a first power supply that provides a first voltage about equal to a working voltage of the CPU;

a second power terminal connected to a second power supply that provides a second voltage about equal to a working voltage of the EPROM; and

an output enable terminal electronically connected to the first power supply, so that the voltage converting chip is always in a working state;

wherein when the CPU execute a read operation to the EPROM, the voltage converting circuit converts a voltage of a signal output by the EPROM into a voltage that can be identified by the CPU;

when the CPU execute a write operation to the EPROM, the voltage converting circuit converts a voltage of a signal output by the CPU into a voltage that can be identified by the EPROM.

7. The portable electronic device of claim 6, wherein the first power supply is integrated with a system power of the portable electronic device which provides the first voltage to the first power terminal.

8. The portable electronic device of claim 6, wherein the second power supply is integrated with a power supply of the EPROM which provides the second voltage to the second power terminal.

9. The portable electronic device of claim 6, wherein the first port is connected to the first power supply through a first pull-up resistor.

10. The portable electronic device of claim 6, wherein the second port is connected to the second power supply through a second pull-up resistor.

11. The portable electronic device of claim 6, wherein the signal terminal is connected to ground through a transient voltage suppressor.

12. The portable electronic device of claim 6, wherein the battery comprises a power terminal providing power to the portable electronic device.

13. The portable electronic device of claim 12, wherein the power terminal is connected to ground through a group of capacitors connected in parallel.

14. The portable electronic device of claim 12, further comprising a power supply circuit, wherein the power supply circuit comprises a battery base received the battery.

15. The portable electronic device of claim 14, wherein the battery base comprises a power pin;

the power pin is connected to a power contact within a battery receiving space of the portable electronic device and is also connected to the power terminal of the battery.

16. The portable electronic device of claim 14, wherein the battery base comprises a signal pin;

the signal pin is connected to a signal contact within a battery receiving space of the portable electronic device and is also connected to the signal terminal of the battery.