Datasheet

LM185-1.2-N, LM285-1.2-N, LM385-1.2-N
SNVS742E –JANUARY 2000–REVISED APRIL 2013 www.ti.com
Thermocouple Seebeck R1 R2 Voltage Voltage
Type Coefficient (Ω) (Ω) Across R1 Across R2
(μV/°C) @ 25°C (mV)
(mV)
J 52.3 523 1.24k 15.60 14.32
T 42.8 432 1k 12.77 11.78
K 40.8 412 953Ω 12.17 11.17
S 6.4 63.4 150Ω 1.908 1.766
Typical supply current 50μA
Calibration
1. Adjust R1 so that V1 = temp at 1mV/°K
2. Adjust V2 to 273.2mV
†I
Q
for 1.3V to 1.6V battery volt-
age = 50μA to 150μA
Figure 26. Centigrade Thermometer
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