Backup battery power supply for microprocessor based telephone

Details Backup battery power supply for microprocessor based telephone Backup battery power supply for microprocessor based telephone

H - Electricity

04

M

379/63

H04M 19/00 (2006.01) G06F 1/30 (2006.01) H02J 9/06 (2006.01) H04M 19/08 (2006.01)

Patent

CA 1245383

BACKUP BATTERY POWER SUPPLY FOR MICROPROCESSOR BASED TELEPHONE ABSTRACT OF THE INVENTION A circuit arrangement for use in telephone instruments which require battery backup for memory retention and microprocessor operation during such procedures as pulse dial address signalling where no power can be supplied by the telephone subscriber's line. Bipolar solid state circuitry may be used to provide the necessary backup power supply during these periods.

500682

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