Driving method of electronic device

• US 8,656,230 B2
• Filed: 06/23/2011
• Issued: 02/18/2014
• Est. Priority Date: 06/25/2010
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Takahashi, Yasuyuki
• Primary Examiner(s): TU, CHRISTINE TRINH LE
• Application Number:
  US13/167,126
• Publication Number:
  US 20110320891A1
• Time in Patent Office: 971 Days
• Field of Search: 714/718, 714/724, 714/740, 714/745, 714/799, 714/300, 714/320, 714/340, 307/11, 307/25, 307/38, 320103-104, 320/124, 320127-130, 320/133, 320/135, 320/137, 320/155
• US Class Current: 714/718
• CPC Class Codes: G11C 17/18 Auxiliary circuits, e.g. for writing into memory
• CPC Class Codes: G11C 29/785 with redundancy programming schemes

Abstract

A method for driving an electronic device stably is provided. The electronic device includes a power supply circuit to which power is fed by power sequentially supplied from a contactless power feeding device, and a plurality of loads to which power is sequentially supplied from the power supply circuit. Further, a method for driving an electronic device stably is provided. The electronic device includes a power supply circuit to which power is fed by power supplied from a contactless power feeding device, and one or more loads to which the power supply circuit repeatedly supplies power. The power supply potential V_dd is restored to more than or equal to 90% of the initial potential V_dd0 within an interval in which the power supply circuit is not connected to a load; then, the next load may be connected to the power supply circuit, and may be driven.

Claims

1. A driving method of an electronic device, wherein the electronic device comprises a power supply circuit to which power is fed from a contactless power feeding device, a control circuit to which power supply potential is supplied from the power supply circuit, and a load circuit, and wherein the power supply potential of the power supply circuit, when the power supply circuit is connected to no load element, is an initial potential, comprising the steps of:

supplying power to a first load element included in the load circuit by the power supply circuit in a first period;

stopping supplying power to a second load element by the power supply circuit in a second period, so that the power supply potential of the power supply circuit is restored to more than or equal to 90% and less than 100% of the initial potential; and

supplying power to a third load element included in the load circuit by the power supply circuit in a third period,

wherein the second period and the third period are alternately repeated n times wherein n is an integer equal to or larger than 0.

2. The driving method of the electronic device according to claim 1, wherein the third load element included in the load circuit comprises an one time programmable ROM.

3. The driving method of the electronic device according to claim 2, wherein data is written in a memory element of the ROM before the second period, further comprising the steps of:

verifying the data; and

outputting a result of the verifying the data.

4. The driving method of the electronic device according to claim 2, wherein data is written in a memory element of the ROM before the second period, further comprising the steps of:

verifying the data; and

outputting a result of the verifying the data,

wherein when a writing error is detected by the verifying the data, a length of the third period is changed.

5. A driving method of an electronic device, wherein the electronic device comprises a power supply circuit to which power is fed from a contactless power feeding device, a control circuit to which power supply potential is supplied from the power supply circuit, and a load circuit, and wherein the power supply potential of the power supply circuit, when the power supply circuit is connected to no load element, is an initial potential comprising the steps of:

supplying power to a dummy load element included in the load circuit by the power supply circuit in a first period;

stopping supplying power to an intrinsic load element included in the load circuit by the power supply circuit in a second period, so that the power supply potential of the power supply circuit is restored to more than or equal to 90% and less than 100% of the initial potential; and

supplying power to the intrinsic load element included in the load circuit by the power supply circuit in a third period,

wherein the second period and the third period are alternately repeated n times wherein n is an integer equal to or larger than 0.

6. The driving method of the electronic device according to claim 5, wherein the intrinsic load element included in the load circuit comprises an one time programmable ROM.

7. The driving method of the electronic device according to claim 6, wherein data is written in a memory element of the ROM before the second period, further comprising the steps of:

verifying the data; and

outputting a result of the verifying the data.

8. The driving method of the electronic device according to claim 6, wherein data is written in a memory element of the ROM before the second period, further comprising the steps of:

verifying the data; and

outputting a result of the verifying the data,

wherein when a writing error is detected by verifying the data, a length of the third period is changed.

9. A driving method of an electronic device, wherein the electronic device comprises a power supply circuit to which power is fed from a contactless power feeding device, and a load circuit, and wherein power supply potential of the power supply circuit connected to no load element is an initial potential, comprising the steps of:

supplying power to a first load element included in the load circuit by the power supply circuit in a first period;

stopping supplying power to the first load element by the power supply circuit in a second period, so that the power supply potential of the power supply circuit is restored to more than or equal to 90% and less than 100% of the initial potential; and

supplying power to a second load element included in the load circuit by the power supply circuit in a third period.

10. The driving method of the electronic device according to claim 9, wherein the second load element included in the load circuit comprises an one time programmable ROM.

11. The driving method of the electronic device according to claim 10, wherein data is written in a memory element of the ROM before the second period, further comprising the steps of:

verifying the data; and

outputting a result of the verifying the data.

12. The driving method of the electronic device according to claim 10, wherein data is written in a memory element of the ROM before the second period, further comprising the steps of:

verifying the data; and

outputting a result of the verifying the data,

wherein when a writing error is detected by the verifying the data, a length of the third period is changed.