Electrically powered portable medium

Details Electrically powered portable medium Electrically powered portable medium

1990-03-14

1991-12-10

Pitts, Harold

Registers

Records

Conductive

235487, G06F 1906

Patent

active

050721038

ABSTRACT:
An IC card which is substantially a portable medium incorporates data memory and control element composed of CPU. This IC card is provided with a keyboard and a display. In addition, IC card also incorporates a calender circuit which is constantly operated by internal battery, and battery checking circuit which causes resistor and Zener diode to generate a reference voltage. Battery checking circuit allows current to flow through the system constituents only when the power switch is activated for operating IC card. To implement power-saving operation of the system, semiconductor switches are installed between the internal battery and the battery checking circuit.

REFERENCES:
patent: 4313079 (1982-01-01), Lee
patent: 4575680 (1986-03-01), Gold
patent: 4665370 (1987-05-01), Holland
patent: 4810864 (1989-03-01), Takahashi
Rochelle Park, "Short Beep Means a Good Battery at Turn-On", Electronic Design, vol. 28 (1980), Aug., No. 17, p. 2328.
Patent Abstracts of Japan, vol. 11, No. 9 (P-634)(2456), 10 Jan. 1987.
Patent Abstracts of Japan, vol. 12, No. 443 (P-790) (3290) 22 Nov. 1988.
European Search Report re Appln EP 88 31 0551, Publication #0 316 157.

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