Backup battery switching circuitry for a microcomputer or a micr

Details Backup battery switching circuitry for a microcomputer or a micr Backup battery switching circuitry for a microcomputer or a micr

1988-03-10

1990-03-13

Zache, Raulfe B.

Boots, shoes, and leggings

371 66, 307 66, 365229, 36494391, 3649442, 3649484, 3649462, G06F 100, G11C 700

Patent

active

049087908

ABSTRACT:
Backup battery switching circuitry for a microcomputer or a microprocessor includes circuitry for selectively coupling a backup battery to a power supply output terminal of the microcomputer or microprocessor for powering an external circuit such as a static RAM. The backup battery voltage is normally coupled to the power supply output terminal in the absence of a primary power source, but may be isolated from the power supply output terminal when a predetermined voltage is applied to a logic input pin and a predetermined sequence of events is executed by the microcomputer or microprocessor.

REFERENCES:
patent: 4122359 (1978-10-01), Breikss
patent: 4203153 (1980-05-01), Boyd
patent: 4422163 (1983-12-01), Oldenkamp
patent: 4458307 (1984-07-01), McAnlis et al.
patent: 4645943 (1987-02-01), Smith, Jr. et al.
patent: 4730121 (1988-03-01), Lee et al.
patent: 4816862 (1989-03-01), Taniguchi

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