Electrical transmission or interconnection systems – Plural supply circuits or sources – Substitute or emergency source
Patent
1992-01-03
1995-06-27
Young, Brian K.
Electrical transmission or interconnection systems
Plural supply circuits or sources
Substitute or emergency source
365229, H02J 900, G11C 1400
Patent
active
054282527
ABSTRACT:
A microcontroller power management system wherein the voltage of a power supply is monitored and the microcontroller central processing unit ("CPU") receives an interrupt signal when the supply voltage falls below a predetermined level. The CPU monitors the duration of the low voltage condition and switches into a sleep mode, after storing any data in its registers that are not maintained in the sleep mode, when that duration exceeds a fixed limit that indicates more than a temporary power glitch is being experienced. If only a short power glitch, the CPU continues normal operation. A large capacitor connected to the power supply input to the microcontroller provides enough energy for the microcontroller to operate normally during short glitches and to operate in a sleep mode for a considerable time, thereby maintaining data in CMOS static RAM until power is restored. This is particularly useful for battery operated systems, responding to both a low battery voltage condition and to a complete loss of power during battery replacement.
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IBM Technical Disclosure Bulletin, vol. 29 No. 6 Nov. 1986, pp. 2641-2643.
So Victor
Walker Andre B.
Fleming Fritz M.
Young Brian K.
Zilog Inc.
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