L9705 Ver la hoja de datos (PDF) - STMicroelectronics

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L9705

DOUBLE QUAD CONTACT INTERFACE CIRCUIT

STMicroelectronics 

L9705

DOUBLE QUAD CONTACT INTERFACE CIRCUIT

s OPERATING DC SUPPLY VOLTAGE RANGE

5V TO 25V

s SUPPLY OVERVOLTAGE PULSE UP TO 40V

s VERY LOW STAND-BY QUIESCENT

CURRENT, MAX 50µA

s INTERNAL CLAMPING DIODES AT

CONTACT INPUTS TO Vs AND gnd WITH

DIP20

SO20

PULSE CURRENT CAPABILITY UP TO

+50mA, -75mA

s CHIP ENABLE FUNCTION AND

) TRISTATE OUTPUTS FOR PARALLEL BUS

t(s CONNECTION

s NOMINAL CONTACT CURRENTS OF 10mA

uc DEFINED WITH EXTERNAL CONTACT

d SERIES RESISTORS RIN1-8

ro s CONTACT STATUS MONITORING BY

P MEANS OF COMPARING THE RESISTANCE

AT CONTACT SENSE INPUTS WITH THE

te INTERNAL REFERENCE RESISTOR VALUE

le s RESISTANCE COMPARING WITH

o HYSTERESIS FOR HIGH NOISE IMMUNITY

bs AND IMMUNITY TO GROUND AND BATTERY

POTENTIAL DIFFERENCES

Obsolete Product(s) - O BLOCK DIAGRAM

ORDERING NUMBERS:

L9705

L9705D

DESCRIPTION

The L9705 is a bipolar monolithic integrated circuit

for monitoring the status of up to four contacts con-

nected to GND and up to four contacts connected

to the battery. The contact sense input supply the

contact current and perform the contact resistance

comparison function.

At the output the contact status is translated into a

logical LOW level (contact closed) or logical HIGH

level (contact open).

November 2003

1/8

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