SEMICONDUCTOR DEVICE AND ITS OPERATION METHOD

Title:

SEMICONDUCTOR DEVICE AND ITS OPERATION METHOD

Document Type and Number:

Japanese Patent JP2007272882

Kind Code:

A

Abstract:

To provide a semiconductor device having an RFID capable of sending and receiving personal information without requiring the operation of confirming the residual capacity of a drive battery or replacing the battery due to aged deterioration, while maintaining the sending and receiving of personal information in a good condition even if the electric power of an electric or electromagnetic wave from the outside is not sufficient.

A battery (or secondary battery) is provided as a power supply for supplying electric power to an RFID. If electric power obtained from a signal received from the outside is greater than predetermined electric power, that extra electric power is stored in the battery; if the electric power obtained from the signal received from the outside is smaller than the predetermined electric power, the electric power obtained from the battery is used as electric power for drive.

Inventors:

YAMAZAKI SHUNPEI
KOYAMA JUN
ISHII MASAHITO
ATAMI TOMOAKI
NAGATA TAKESHI
IKEDA TAKAYUKI
KUROKAWA YOSHIMOTO
SHIONOIRI YUTAKA

Application Number:

JP2007059653A

Publication Date:

October 18, 2007

Filing Date:

March 09, 2007

Export Citation:

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Assignee:

SEMICONDUCTOR ENERGY LAB

International Classes:

G06K19/07; H01L21/3205; H01L21/768; H01L23/52; H01L23/522; H01L23/532; H01L29/417; H01L29/423; H01L29/49

Domestic Patent References:

JP2000090221A	2000-03-31
JPH11345292A	1999-12-14
JP2001014439A	2001-01-19

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