LM56 datasheet(7/13 Pages) NSC

7 / 13 page

Functional Description

01289315

Pin Descriptions

This is the positive supply voltage pin. This pin

should be bypassed with a 0.1 µF capacitor to

ground.

GND

This is the ground pin.

REF

This is the 1.250V bandgap voltage reference output

pin. In order to maintain trip point accuracy this pin

should source a 50 µA load.

TEMP This is the temperature sensor output pin.

OUT1 This is an open collector digital output. OUT1 is

active LOW. It goes LOW when the temperature is

greater than T

1 and goes HIGH when the tempera-

ture drops below T

1– 5˚C. This output is not intended

to directly drive a fan motor.

OUT2 This is an open collector digital output. OUT2 is

active LOW. It goes LOW when the temperature is

greater than the T

2 set point and goes HIGH when

the temperature is less than T

2– 5˚C. This output is

not intended to directly drive a fan motor.

This is the input pin for the temperature trip point

voltage for OUT1.

This is the input pin for the low temperature trip point

voltage for OUT2.

01289316

VT1 = 1.250V x (R1)/(R1 + R2 + R3)

VT2 = 1.250V x (R1 + R2)/(R1 + R2 + R3)

where:

(R1+R2+R3)=27k

Ω and

VT1 or T2 = [6.20 mV/˚C x T] + 395 mV therefore:

R1=VT1/(1.25V) x 27 kΩ

R2=(VT2/(1.25V) x 27 k)Ω–R1

R3=27k

Ω −R1−R2

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