Mos battery backup controller for microcomputer random...

Details Mos battery backup controller for microcomputer random... Mos battery backup controller for microcomputer random...

H - Electricity

02

J

320/11, 354/222,

H02J 9/06 (2006.01) G11C 5/14 (2006.01) G11C 11/40 (2006.01)

Patent

CA 1188002

ABSTRACT MOS control circuitry for incorporation on a microcomputer IC chip for assuring adequate power to maintain the data in an associated static random access memory, A rechargeable battery provides standby power, and the voltage level of the battery is compared with the microcomputer Vcc supply. Whenever Vcc drops below a predetermined level, such as the standby }battery voltage level , the circuitry disconnects the Vcc from the memory input power and replaces it with s standby battery power. When Vcc is returned to the system, a gate applies a trickle charge to the battery.

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