Semiconductor device

• US 20080111702A1
• Filed: 10/29/2007
• Published: 05/15/2008
• Est. Priority Date: 11/14/2006
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Osada, Takeshi
• Granted Patent: US 8,044,800 B2
• Time in Patent Office: Days
• US Class Current: 340/636.1
• CPC Class Codes: H01M 10/425 Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing printed circuits H05K1/00
• CPC Class Codes: H01M 6/50 Methods or arrangements for servicing or maintenance, e.g. for maintaining operating temperature constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals, H01M50/569
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

A semiconductor device with a built-in battery whose residual amount of the electrical energy can be detected accurately. The semiconductor device has a battery, a demodulation circuit, a control circuit which generates a signal having information about the residual amount of the electrical energy stored in the battery, and a transmission medium which displays the residual amount of the electrical energy in accordance with the signal. The demodulation circuit demodulates a signal input from an antenna which requests display of the residual amount of the electrical energy. Based on the demodulated signal, the control circuit starts to generate a signal having information about the residual amount of the electrical energy in the battery.

Claims

1. A semiconductor device comprising:

an antenna configured to receive a radio wave;

a demodulation circuit configured to demodulate a first signal generated by the antenna;

a battery;

a control circuit configured to detect a voltage output from the battery in accordance with the first demodulated signal, and generate a second signal having information about a residual amount of electrical energy in the battery; and

a transmission medium configured to display the residual amount of the electrical energy in the battery in accordance with the second signal.

4. The semiconductor device according to claim 1, wherein the transmission medium is a light-emitting element, a liquid crystal cell, an electronic ink, a DMD, or a speaker.

7. The semiconductor device according to claim 1, wherein the battery is a primary battery or a secondary battery.

8. The semiconductor device according to claim 1, wherein the control circuit comprises an oscillator circuit configured to control a frequency of the second signal.

11. The semiconductor device according to claim 1, wherein the antenna is a coiled antenna or a dipole antenna.

2. A semiconductor device comprising:

an antenna configured to receive a radio wave;

a demodulation circuit configured to demodulate a first signal generated by the antenna;

a rectifier circuit configured to rectify the first signal to generate a DC voltage;

a secondary battery;

a charging circuit configured to charge the secondary battery by using the DC voltage;

a control circuit configured to detect a voltage output from the secondary battery in accordance with the first demodulated signal, and generate a second signal having information about a residual amount of electrical energy in the secondary battery; and

a transmission medium configured to display the residual amount of the electrical energy in the secondary battery in accordance with the second signal.

5. The semiconductor device according to claim 2, wherein the transmission medium is a light-emitting element, a liquid crystal cell, an electronic ink, a DMD, or a speaker.

9. The semiconductor device according to claim 2, wherein the control circuit comprises an oscillator circuit configured to control a frequency of the second signal.

12. The semiconductor device according to claim 2, wherein the antenna is a coiled antenna or a dipole antenna.

3. A semiconductor device comprising:

an antenna configured to receive a radio wave;

a demodulation circuit configured to demodulate a first signal generated by the antenna;

a rectifier circuit configured to rectify the first signal to generate a DC voltage;

a control circuit configured to detect the DC voltage in accordance with the first demodulated signal, and generate a second signal having location information of the semiconductor device; and

a transmission medium configured to display the location information of the semiconductor device in accordance with the second signal.

6. The semiconductor device according to claim 3, wherein the transmission medium is a light-emitting element, a liquid crystal cell, an electronic ink, a DMD, or a speaker.

10. The semiconductor device according to claim 3, wherein the control circuit comprises an oscillator circuit configured to control a frequency of the second signal.

13. The semiconductor device according to claim 3, wherein the antenna is a coiled antenna or a dipole antenna.