Portable electronic device having an external I/O unit and power

Details Portable electronic device having an external I/O unit and power Portable electronic device having an external I/O unit and power

1993-11-23

1996-07-30

Chin, Stephen

Telephonic communications

With usage measurement

379112, 379114, 379144, 379357, 235380, 235382, 235379, H04M 1500, H04M 1700, G06F 1760, G06F 500

Patent

active

055419852

ABSTRACT:
An IC card reader-writer is integrated with a battery pack 15. This IC card reader-writer 16 has a control terminal CNT and a power supply control switch 30. A portable phone unit sends power-on/off signals, which are received by the control terminal CNT to turn on and off the power supply control switch 30 to control power supply from the battery 18 to the IC card reader-writer 16. The CPU 24 of the IC card reader-writer 16 controls power supply in such a manner that power is supplied to the IC card 22 only when access to the IC card 22 is necessary and stopped when access to the IC card 22 is unnecessary.

REFERENCES:
patent: 4868846 (1989-09-01), Kemppi
patent: 4900902 (1990-02-01), Sakakibara
patent: 4907257 (1990-03-01), Asano
patent: 4954072 (1990-09-01), Zimmerman
patent: 5105074 (1992-04-01), Nara
patent: 5109540 (1992-04-01), Dzung
patent: 5119414 (1992-06-01), Izumi
patent: 5138650 (1992-08-01), Stahl
patent: 5157247 (1992-10-01), Takahira
patent: 5168151 (1992-12-01), Nara
patent: 5247164 (1993-09-01), Takahashi
patent: 5266782 (1993-11-01), Alanara
patent: 5285055 (1994-02-01), Oonakahara
patent: 5317247 (1994-05-01), Chang
patent: 5335276 (1994-08-01), Thompson

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