ISL88011IH546Z-TK データシートの表示（PDF） - Intersil

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ISL88011IH546Z-TK

5 Ld Voltage Supervisors with Adjustable Power-On Reset, Dual Voltage Monitoring or Watchdog Timer Capability

Intersil 

ISL88011, ISL88012, ISL88013, ISL88014, ISL88015

VDD

VTHVDD

1V

VMON

VTHVMON

>tMR

MR

tPOR

tRPD

tPOR

tRPD

tPOR

tPOR

RST

RST

FIGURE 1. VOLTAGE MONITORING TIMING DIAGRAM

Principles of Operation

The ISL88011 through ISL88015 devices provide those

functions needed for critical voltage monitoring. These

features include Power-On Reset control, customizable

supply voltage supervision, Watchdog Timer capability, and

manual reset assertion. By integrating all of these features

into a small 5 Ld SOT-23 package and using only 5.5µA of

supply current, the ISL88011 through ISL88015 devices can

assist in lowering system cost, reducing board space

requirements, and increasing the reliability of a system.

Low Voltage Monitoring

During normal operation, these supervisors monitor both the

voltage level of VDD (ISL88011, ISL88012, ISL88013) and/or

VMON (ISL88012, ISL88014, ISL88015). The device asserts

a reset if any of these voltages falls below their respective

trip points. The reset signal effectively prevents the system

from operating during a power failure or brownout condition.

This reset signal remains asserted until VDD and the voltage

on VMON exceed their voltage threshold setting for the reset

time delay period tPOR of 200ms (See Figure 1).

The ISL88012, ISL88014 and ISL88015 allow users to

customize the minimum voltage sense level on the VMON

input pin. To do this, connect an external resistor divider

network to the VMON pin in order to set the trip point to

some voltage above 600mV according to the following

equation (See Figure 2):

VINTRIP

=

0.6

×

(---R----1-----+-----R----2----)

R2

(EQ. 1)

R1 VMON

VIN

R2

ISL88012

ISL88014

ISL88015

FIGURE 2. USING VMON TO MONITOR VIN VIA RESISTORS

8

FN8093.3

August 9, 2011

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