LMT90DBZR Datasheet, PDF (1/14 Pages) Texas Instruments – LMT90 SOT-23 Single-Supply Centigrade Temperature Sensor

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SNIS177A – MARCH 2013 – REVISED AUGUST 2013
LMT90 SOT-23 Single-Supply Centigrade Temperature Sensor
FEATURES
1
•2 Cost-Effective Alternative to Thermistors
• Calibrated Directly in Degree Celsius
(Centigrade)
• Linear + 10.0 mV/°C Scale Factor
• ±3°C Accuracy Guaranteed at +25°C
• Specified for Full −40° to +125°C range
• Suitable for Remote Applications
• Low Cost Due to Wafer-level Trimming
• Operates from 4.5V to 10V
• Less than 130 μA Current Drain
• Low Self-heating, Less than 0.2°C in Still Air
• Nonlinearity Less than 0.8°C Over Temp
APPLICATIONS
• Industrial
• HVAC
• Disk Drives
• Automotive
• Portable Medical Instruments
• Computers
• Battery Management
• Printers
• Power Supply Modules
• FAX Machines
DESCRIPTION
The LMT90 is a precision integrated-circuit
temperature sensor that can sense a −40°C to
+125°C temperature range using a single positive
supply. The LMT90's output voltage is linearly
proportional to Celsius (Centigrade) temperature (+10
mV/°C) and has a DC offset of +500 mV. The offset
allows reading negative temperatures without the
need for a negative supply. The ideal output voltage
of the LMT90 ranges from +100 mV to +1.75V for a
−40°C to +125°C temperature range. The LMT90
does not require any external calibration or trimming
to provide accuracies of ±3°C at room temperature
and ±4°C over the full −40°C to +125°C temperature
range. Trimming and calibration of the LMT90 at the
wafer level assure low cost and high accuracy. The
LMT90's linear output, +500 mV offset, and factory
calibration simplify circuitry required in a single supply
environment where reading negative temperatures is
required. The LMT90's quiescent current is less than
130 μA, thus self-heating is limited to a very low
0.2°C in still air.
The LMT90 is a cost-competitive alternative to
thermistors.
CONNECTION DIAGRAM
Figure 1. SOT-23 Top View
TYPICAL APPLICATION
+V_S
(4.5 V to 10 V)
LMT90
Output
VOUT = (10 mV/°C K Temp °C) + 500 mV
V_OUT = +1.750 V at +125°C
V_OUT = +750 mV at +25°C
V_OUT = +100 mV at -40°C
Figure 2. Full-Range Centigrade Temperature
Sensor (−40°C to +125°C)
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
2
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