MC33064/MC34064

PRODUCT DA T ABOOK 1996/1997

9

Copyright © 1999

Rev. 1.3

6/99

TYPICAL APPLICA TION CIRCUITS

FIGURE 15. — LOW VOLTAGE MICROPROCESSOR RESET

A time delayed reset can be accomplished with the addition of C

For systems with extremely fast power supply rise times (< 500ns) it

is recommended that the RC

V

Overheating of the logic level power MOSFET due to insufficient gate

voltage can be prevented with the above circuit. When the input signal is

below the 4.6 volt threshold of the MC34064, its output grounds the gate

FIGURE 17. — VOLTAGE MONITOR

FIGURE 18. — MOSFET LOW VOLTAGE GATE DRIVE PROTECTION

V

TH(MPU)

V

IN

1 -

t

1

FIGURE 16. — SWITCHING THE LOAD OFF WHEN

BATTERY REACHES BELOW 4.3V

POWER

SUPPLY

1.2 V

REF

MICROPROCESSOR

CIRCUIT

RESET

C

DLY

R

V

IN

1.2 V

REF

LOAD

RESET

V

IN

POWER

SUPPLY

1.2 V

REF

RESET

V

IN

1.0k

1.2 V

REF

RESET

V

IN

270

4.3V

V

CC

R

L

SMP60N03-10L