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Title:
POWER SUPPLY CONTROL CIRCUIT
Document Type and Number:
Japanese Patent JP2008005564
Kind Code:
A
Abstract:

To provide a power supply control circuit which can supply a stabilized power supply voltage to the internal circuit even if a voltage of ground GND level is applied to a power supply terminal for contact communication when contact communication is stopped and noncontact communication is performed.

Stabilized power is supplied to the internal circuit by detecting communication situation of contact communication/noncontact communication and power supply situation and disconnecting/connecting the power supply terminal for contact communication from/with the internal circuit.


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Inventors:
SUGITA RYOICHI
Application Number:
JP2004289748A
Publication Date:
January 10, 2008
Filing Date:
October 01, 2004
Export Citation:
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Assignee:
MATSUSHITA ELECTRIC IND CO LTD
International Classes:
H02J13/00; H02J1/00; H02J7/00; H02M3/07
Attorney, Agent or Firm:
Fumio Iwahashi
Tomoyasu Sakaguchi
Hiroki Naito



 
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