Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1992-10-19
1994-11-15
Peng, John K.
Communications: electrical
Condition responsive indicating system
Specific condition
320 48, 364707, G08B 2100
Patent
active
053652215
ABSTRACT:
A battery powered electronic device (105) for coupling to a host computer (205 ) comprises an interface (115) for transmitting data and an annunciator (340) for generating a sensible alert. The electronic device (105) further comprises interface monitoring circuitry (320) coupled to the interface (115) for determining an interface status as being active or inactive and voltage monitoring circuitry (360) coupled to a battery (355) for monitoring the battery voltage. Threshold detection circuitry (360) coupled to the voltage monitoring circuitry (360) detects that the battery voltage has exceeded a predetermined threshold voltage and generates a low battery signal in response thereto. A controller (320) receives the low battery signal and, in response thereto, provides a low battery indication to the interface (115) when the interface (115) has an active status and provides an activation signal to the annunciator (340) when the interface (115) has an inactive status.
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patent: 4247908 (1981-01-01), Lockhart, Jr. et al.
patent: 5043721 (1991-08-01), May
patent: 5072103 (1991-12-01), Narz
patent: 5157247 (1992-10-01), Takahira
patent: 5262868 (1993-11-01), Kaneko et al.
"PC Card Standard", Release 2.0, Sep., '91, Personal Computer Memory Card International Association, Sunnyvale, Calif.
Cannon Gregory L.
Fennell Robert D.
Fuller Gregory W.
Macko William J.
Gardner Kelly A.
Lefkowitz Edward
Motorola Inc.
Peng John K.
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