LM56CIMM/NOPB National Semiconductor, LM56CIMM/NOPB Datasheet - Page 7

• Manufacturer Part Number: LM56CIMM/NOPB
• Description: IC, LOW POWER THERMOSTAT, ± 3°C, MSOP-8
• Manufacturer: National Semiconductor

Specifications of LM56CIMM/NOPB

• Ic Output Type: Digital
• Sensing Accuracy Range: ± 3°C
• Supply Current: 230µA
• Supply Voltage Range: 2.7V To 10V
• Sensor Case Style: MSOP
• No. Of Pins: 8
• Msl: MSL 1 - Unlimited
• Accuracy %: 3°C
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Functional Description
Pin Descriptions
V
GND
V
V
OUT1 This is an open collector digital output. OUT1 is active
OUT2 This is an open collector digital output. OUT2 is active
V
V
+
REF
TEMP
T1
T2
This is the positive supply voltage pin. This pin should
be bypassed with a 0.1 μF capacitor to ground.
This is the ground pin.
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.
This is the temperature sensor output pin.
LOW. It goes LOW when the temperature is greater
than T
below T
drive a fan motor.
LOW. It goes LOW when the temperature is greater
than the T
perature is less than T
tended to directly drive a fan motor.
This is the input pin for the temperature trip point volt-
age for OUT1.
This is the input pin for the low temperature trip point
voltage for OUT2.
1
1
and goes HIGH when the temperature drops
– 5°C. This output is not intended to directly
2
set point and goes HIGH when the tem-
2
– 5°C. This output is not in-
7
V
V
where:
(R1 + R2 + R3) = 27 kΩ and
V
R1 = V
R2 = (V
R3 = 27 kΩ − R1 − R2
T1
T2
T1 or T2
= 1.250V x (R1)/(R1 + R2 + R3)
= 1.250V x (R1 + R2)/(R1 + R2 + R3)
T1
T2
= [6.20 mV/°C x T] + 395 mV therefore:
/(1.25V) x 27 kΩ
/(1.25V) x 27 k)Ω–R1
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