APPARATUS FOR DEFINED SWITCHING OF A MICROCOMPUTER TO STANDBY MODE

摘要

PCT No. PCT/EP88/00684 Sec. 371 Date Jan. 3, 1991 Sec. 102(e) Date Jan. 3, 1991 PCT Filed Jul. 28, 1988 PCT Pub. No. WO90/01189 PCT Pub. Date Feb. 8, 1990.A voltage regulator connected to a microcomputer is switched from main power to standby power by a monitoring integrated circuit in response to a switch off by the control circuit after receiving a switch off command, from an ignition switch, and only after the computer has been reset. The monitoring integrated circuit has a plurality of circuit elements including a circuit element which generates a control signal for switching the voltage regulator to a state producing a standby voltage which powers the microprocessor to save the information in the microprocessor memory. Preferably the circuit element generating the control signal is an operational amplifier whose output is fed by a time delay network which delays switching of the voltage regulator.