December 16, 2009
LM95172
13-Bit to 16-Bit 200°C Digital Temp Sensor with 3-Wire
Interface
General Description
Features
The LM95172EWG is an integrated digital-output tempera-
ture sensor with a Serial Peripheral Interface (SPI) and MI-
CROWIRE™-compatible interface in a 10-pin Cerpack high
temperature ceramic package. It features a very linear Sigma-
Delta Analog-to-Digital Converter (ADC), high accuracy, fast
conversion rates, and extremely low output noise. With an
operating temperature as low as -40°C and optimized accu-
racy from 120°C to 200°C, it is ideal for high-temperature
applications.
LM95172EWG is AEC-Q100 Grade 0 qualified and is
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manufactured on an Automotive Grade Flow.
13-bit (0.0625°C LSB) to 16-bit (0.0078125°C LSB)
temperature resolution
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Wide −40°C to +200°C temperature range
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35 ms best conversion time tracks fast temp changes
OVERTEMP digital output switches when TDIE > THIGH
Shutdown mode saves power yet wakes up for one-shot
temperature update
The over-temperature alarm output (OVERTEMP) asserts
when the die temperature exceeds a programmed THIGH limit.
The user-programmed TLOW limit creates a temperature-sta-
bilizing hysteresis when the ambient temperature is near the
trip point.
SPI and MICROWIRE Bus interface
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10-Pin Cerpack high-temperature ceramic package
Key Specifications
The LM95172EWG can be programmed to operate from 13
bits (0.0625°C per LSB) to 16 bits (0.0078125°C per LSB)
resolution. The LM95172EWG powers up in 35 ms, the
fastest conversion time, with temperature output set at 13-bit
resolution. The resolution may then be changed to 14-, 15- or
16-bits. When in the 13-, 14- or 15-bit resolution mode, the
least significant bit in the 16-bit temperature register toggles
after the completion of each conversion. This bit may be mon-
itored to verify that the conversion is complete.
3.0V to 5.5V
■ꢀAnalog and Digital Supply Voltage
■ꢀTotal Supply Current ꢀꢀꢀꢀOperating
400 µA (typ)
4 µA (max)
Shutdownꢀ−40°C to +140°C
Shutdownꢀ−40°C to +175°C
Shutdownꢀ−40°C to +200°C
12 µA (max)
28 µA (max)
■ꢀTemperature Accuracy
The high noise immunity of the Serial I/O (SI/O) output makes
the LM95172EWG ideal for use in challenging electromag-
netic environments.
+175°C to +200°C
+130°C to +160°C
+120°C to +130°C
+160°C to +175°C
−40°C to +120°C
±3.0°C (max)
±1.0°C (max)
±2.0°C (max)
±2.0°C (max)
±3.5°C (max)
Applications
Automotive high temperature applications
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■ꢀTemperature Resolution
Industrial Power Controllers
13-bit mode
0.0625°C/LSB
Industrial motors, gear boxes
16-bit mode 0.0078125°C/LSB
Geothermal instrumentation
■ꢀConversion Time
High Temperature Test Equipment
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13-bit mode
16-bit mode
43 ms (max)
350 ms (max)
Connection Diagram
LM95172EWG Top View
30076602
MICROWIRE™ is a trademark of National Semiconductor Corporation.
TRI-STATE® is a registered trademark of National Semiconductor Corporation.
© 2009 National Semiconductor Corporation
300766
www.national.com