Communications: electrical – Continuously variable indicating – With meter reading
Patent
1982-12-22
1985-10-01
Yusko, Donald J.
Communications: electrical
Continuously variable indicating
With meter reading
307140, 340365S, 455127, 455618, 3581941, H04Q 900, G06F 100, H04B 900
Patent
active
045449236
ABSTRACT:
In a battery operated, remote transmitter for a consumer instrument, a microprocessor controls operation of the transmitter. The collector current path of a PNP on-off transistor is coupled between the battery and a voltage supply terminal of the microprocessor. To power up the microprocessor, a keyboard switch in the transmitter is depressed in order to ground the base of the on-off transistor and turn on the transistor. An NPN transistor forms a latch with the PNP transistor to maintain the on-off transistor conductive. After completion of the transmitter signaling, the microprocessor switches an output port to the ground state. The output port is coupled to the base of the NPN transistor and bypasses current therefrom to initiate the regenerative deactivation of the latch. With the latch deactivated, conduction of the on-off transistor is cut off. The voltage supply terminal of the microprocessor is disconnected from the battery to power down the remote transmitter. The emitter of the NPN transistor is coupled to a tap on the battery to ensure reliable self-turn-off of the microprocessor.
REFERENCES:
patent: 3671659 (1972-06-01), Suzuki
patent: 4259594 (1981-03-01), Fox et al.
patent: 4271404 (1981-06-01), Tanaka
patent: 4276483 (1981-06-01), Hayden
patent: 4291261 (1981-09-01), Johnston
patent: 4362954 (1982-12-01), Cotton
patent: 4381459 (1983-04-01), Cotton
patent: 4418416 (1983-11-01), Lese et al.
patent: 4463646 (1984-08-01), Mitarai
COPS Microcontrollers Databook, 1982, by National Semiconductor Corporation.
Page 23 of RCA Corporation "Color Television Basic Service Data-CTC-111 Series", Copyright 1982 and Published in Apr. 1982.
Amaral Joseph E. S.
Blatter Harold
Laks Joseph J.
Rasmussen Paul J.
RCA Corporation
Whitacre Eugene M.
Yusko Donald J.
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