CS1124-D datasheet(3/8 Pages) ONSEMI

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CS1124

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PACKAGE PIN DESCRIPTION*

PACKAGE PIN #

SO–8

PIN SYMBOL

FUNCTION

INAdj

External resistor to ground that sets the trip levels of both channels.

Functions for both diagnostic and normal mode.

IN1

Input to channel 1.

IN2

Input to channel 2.

GND

Ground.

DIAG

Diagnostic mode switch. Normal mode is low.

OUT2

Output of channel 2.

OUT1

Output of channel 1.

VCC

Positive 5.0 volt supply input.

OUT1

µP

VCC

INP1

INAdj

DIAG

IN1

RRS

VRS

Variable

Reluctance

Sensor

–

COMP1

Active

Clamp

RAdj

GND

Figure 2. Application Diagram

THEORY OF OPERATION

NORMAL OPERATION

Figure 2 shows one channel of the CS1124 along with the

necessary external components. Both channels share the

INAdj pin as the negative input to a comparator. A brief

description of the components is as follows:

VRS – Ideal sinusoidal, ground referenced, sensor output

– amplitude usually increases with frequency, depending on

RRS – Source impedance of sensor.

R1/RAdj – External resistors for current limiting and

biasing.

INP1/INAdj – Internal current sources that determine trip

points via R1/RAdj.

COMP1 – Internal comparator with built–in hysteresis

set at 160 mV.

OUT1 – Output 0 V – 5.0 V square wave with the same

frequency as VRS.

By inspection, the voltage at the (+) and (–) terminals of

COMP1 with VRS = 0V are:

V+

+ INP1(R1 ) RRS)

(1)

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