Programmable power supply level detection and initialization cir

Details Programmable power supply level detection and initialization cir Programmable power supply level detection and initialization cir

1990-09-13

1991-05-28

Teska, Kevin J.

Boots, shoes, and leggings

340661, 364550, 364579, G06F 900, G08B 2100

Patent

active

050199960

ABSTRACT:
An apparatus for a signal processing system connected to a power supply having an output level and receiving a clock signal, that is responsive to the output level of the power supply, generates control signals for use as interrupt signals, reset signals and warning signals to the system. The apparatus comprises a detector for generating an undervoltage signal while the output level of the power supply is below a prespecified threshold; a circuit for supplying a programmable signal indicating a programmable threshold; a comparator connected to the power supply and receiving the programmable signal, for generating a voltage threshold signal while the output level is below the programmable threshold; and a programmable logic circuit. The programmable logic circuit receives general purpose inputs, the clock, the undervoltage signal and the low voltage signal, and generates the control signals. Using the invention, designers can easily create a wide variety of individual and sequential control signals which can be generated during power-up and power glitches, in response to externally forced signals, or during undervoltage occurrences.

REFERENCES:
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patent: 4559497 (1985-12-01), Farrugia
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Terry Patterson, "Battery-backup circuit offers system reset," EDN May 26, 1988, p. 212.
George Indorf, "Timer output has variable duty cycle," EDN May 26, 1988, p. 214.
Robert McCarthy, "Digital one-shot has power-on preset," EDN Jan. 21, 1988, p. 208.
T. G. Barnett, "Comparator circuit monitors window events," EDN Feb. 18, 1988, p. 235.
William Andreycak, "Soft-start and delay protects power supply," EDN Feb. 4, 1988, p. 189.
Neal E. Pritchard, "Power-fail circuit gives prompt response," EDN Mar. 31, 1988, p. 197.

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