LMT89 Datasheet, PDF (1/13 Pages) Texas Instruments – LMT89 2.4V, 10 A, SC70, Temperature Sensor

LMT89
www.ti.com
SNIS176 – MARCH 2013
LMT89 2.4V, 10µA, SC70, Temperature Sensor
Check for Samples: LMT89
FEATURES
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•2 Cost-Effective Alternative to Thermistors
• Rated for full −55°C to +130°C range
• Available in an SC70 Package
• Predictable Curvature Error
• Suitable for Remote Applications
APPLICATIONS
• Industrial
• HVAC
• Automotive
• Disk Drives
• Portable Medical Instruments
• Computers
• Battery Management
• Printers
• Power Supply Modules
• FAX Machines
• Mobile Phones
• Automotive
DESCRIPTION
The LMT89 is a precision analog output CMOS
integrated-circuit temperature sensor that operates
over a −55°C to 130°C temperature range. The
power supply operating range is 2.4 V to 5.5 V. The
transfer function of LMT89 is predominately linear, yet
has a slight predictable parabolic curvature. The
accuracy of the LMT89 when specified to a parabolic
transfer function is ±1.5°C at an ambient temperature
of 30°C. The temperature error increases linearly and
reaches a maximum of ±2.5°C at the temperature
range extremes. The temperature range is affected
by the power supply voltage. At a power supply
voltage of 2.7 V to 5.5 V the temperature range
extremes are 130°C and −55°C. Decreasing the
power supply voltage to 2.4 V changes the negative
extreme to −30°C, while the positive remains at
130°C.
The LMT89 quiescent current is less than 10 μA.
Therefore, self-heating is less than 0.02°C in still air.
Shutdown capability for the LMT89 is intrinsic
because its inherent low power consumption allows it
to be powered directly from the output of many logic
gates or does not necessitate shutdown at all.
The LMT89 is a cost-competitive alternative to
thermistors.
TYPICAL APPLICATION
Full-Range Celsius (Centigrade) Temperature Sensor (−55°C TO 130°C) Operating From a Single LI-Ion
Battery Cell
V⁺
V_O
LMT89
GND NC
V_O = (−3.88×10^−6×T²) + (−1.15×10^−2×T) + 1.8639
spacer between the 2 equations
T
1481.96
2.1962 u 10⁶
(1.8639 V_O )
3.88 u10 ⁶
where: T is temperature, and V_O is the measured output voltage of the LMT89.
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PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2013, Texas Instruments Incorporated