LX7001CDM データシートの表示（PDF） - Microsemi Corporation

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LX7001CDM

TRANSIENT IMMUNE UNDERVOLTAGE SENSING CIRCUIT

Microsemi Corporation 

LX7001

PRODUCT DATABOOK 1996/1997

TRANSIENT IMMUNE UNDERVOLTAGE SENSING CIRCUIT

PRODUCTION DATA SHEET

T Y P I C A L A P P L I C AT I O N C I R C U I T S

FIGURE 13. — LOW VOLTAGE MICROPROCESSOR RESET.

VIN

POWER

SUPPLY

RESET

R

CDLY

MICROPROCESSOR

CIRCUIT

FIGURE 14. — SWITCHING THE LOAD OFF WHEN

BATTERY REACHES BELOW 4.3V.

1.2 VREF

VIN

LOAD

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 RCDLY time constant be greater than 5.0µs.

VTH(MPU) is the microprocessor reset input threshold.

tDLY = R CDLY In

1

1

-

VTH(MPU)

VIN

1.2 VREF

POWER

SUPPLY

FIGURE 15. — VOLTAGE MONITOR.

1.0k

VIN

RESET

FIGURE 16. — MOSFET LOW VOLTAGE GATE DRIVE PROTECTION.

VCC

4.3V

270

RL

SMP60N03-10L

VIN

RESET

1.2 VREF

1.2 VREF

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 4.3 volt threshold of the LX7001C, its output grounds the gate

of the L2 MOSFET.

8

Copyright © 1999

Rev. 1.2 6/99

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