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MC33064LP 数据表(PDF) 9 Page - Microsemi Corporation

部件名 MC33064LP
功能描述  UNDERVOLTAGE SENSING CIRCUIT
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制造商  MICROSEMI [Microsemi Corporation]
网页  http://www.microsemi.com
标志 MICROSEMI - Microsemi Corporation

MC33064LP 数据表(HTML) 9 Page - Microsemi Corporation

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U NDER VOL T AGE S ENSING C IRCUIT
MC33064/MC34064
PRODUCT DA T ABOOK 1996/1997
9
Copyright © 1999
Rev. 1.3
6/99
P RODUCTION
D AT A
S HEET
TYPICAL APPLICA TION CIRCUITS
FIGURE 15. — LOW VOLTAGE MICROPROCESSOR RESET
A time delayed reset can be accomplished with the addition of C
DLY.
For systems with extremely fast power supply rise times (< 500ns) it
is recommended that the RC
DLY time constant be greater than 5.0µs.
V
TH(MPU) is the microprocessor reset input threshold.
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
of the L2 MOSFET.
FIGURE 17. — VOLTAGE MONITOR
FIGURE 18. — MOSFET LOW VOLTAGE GATE DRIVE PROTECTION
V
TH(MPU)
V
IN
1 -
t
DLY = R CDLY In
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


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