LMT70 IC Datasheet

LMT70 Datasheet PDF, Equivalent


Part Number

LMT70

Description

RTD and Precision NTC Thermistor IC

Manufacture

etcTI

Total Page 29 Pages
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LMT70
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LMT70, LMT70A
SNIS187A – MARCH 2015 – REVISED JULY 2015
LMT70, LMT70A ±0.05°C Precision Analog Temperature Sensor, RTD and Precision NTC
Thermistor IC
1 Features
1 Accuracy:
– ±0.05°C (typ) or ±0.13°C (max) from 20°C to
42°C
– ±0.2°C (max) from -20°C to 90°C
– ±0.23°C (max) from 90°C to 110°C
– ±0.36°C (max) from -55°C to 150°C
• Wide Temperature Range: 55°C to 150°C
• Matching of Two Adjacent LMT70A on Tape and
Reel: 0.1°C (max) at 30°C
• Very Linear Analog Temperature Sensor with
Output Enable Pin
• NTC Output Slope: -5.19 mV/°C
• Output On/Off Switch with RDS on < 80
• Wide Power Supply Range: 2.0 V to 5.5 V
• Low Power Supply Current: 9.2 µA (typ)12 µA
(max)
• Ultra Small 0.88 mm by 0.88 mm 4-bump WLCSP
(DSBGA) Package
2 Applications
• Internet of Things (IoT) Sensor Nodes
• Industrial RTD (Class AA) or Precision NTC/PTC
Thermistor Replacement
• Medical/Fitness Equipment
• Medical Thermometer
• Human Body temperature monitor
• Metering Temperature Compensation
3 Description
The LMT70 is an ultra-small, high-precision, low-
power CMOS analog temperature sensor with an
output enable pin. Applications for the LMT70 include
virtually any type of temperature sensing where cost-
effective, high precision and low-power are required,
such as Internet of Things (IoT) sensor nodes,
medical thermometers, high-precision instrumentation
and battery powered devices. The LMT70 is also a
great replacement for RTD and precision NTC/PTC
thermistors.
Its output enable pin allows multiple LMT70s to share
one ADC channel, thus simplifying ADC calibration
and reducing the overall system cost for precision
temperature sensing. The LMT70 also has a linear
and low impedance output allowing seamless
interface to an off-the-shelf MCU/ADC. Dissipating
less than 36µW, the LMT70 has ultra-low self-heating
supporting its high-precision over a wide temperature
range.
The LMT70A provides unparalleled temperature
matching performance of 0.1°C (max) for two
adjacent LMT70A's picked from the same tape and
reel. Therefore, the LMT70A is an ideal solution for
energy metering applications requiring heat transfer
calculations.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LMT70
DSBGA - WLCSP (4)
YFQ
0.88 mm x 0.88 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
4 Wide-Range Precision Active RTD or NTC Replacement (55°C to 150°C)
Coin Cell
Battery
2.2V to 3.6V
GPIO1
GPIO2
MSP430
VDD
T_ON
LMT70
TAO
P2.5_VREF
P2.3
M
U
X
1.5V
Vref
ADC
(12-bit)
LMT70 Accuracy vs Temperature
0.60
0.50
0.40
0.30
0.20
0.10
0.00
-0.10
-0.20
-0.30
-0.40
-0.50
-0.60
±60 ±40 ±20
Max Limit
Min Limit
0 20 40 60 80 100 120 140 160
DUT Temperature (ƒC)
C001
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.

LMT70
LMT70, LMT70A
SNIS187A – MARCH 2015 – REVISED JULY 2015
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Wide-Range Precision Active RTD or NTC
Replacement (55°C to 150°C) ............................. 1
5 Revision History..................................................... 2
6 Device Comparison Table..................................... 3
7 Pin Configuration and Functions ......................... 3
8 Specifications......................................................... 4
8.1 Absolute Maximum Ratings ...................................... 4
8.2 ESD Ratings.............................................................. 4
8.3 Recommended Operating Conditions....................... 4
8.4 Thermal Information .................................................. 4
8.5 Electrical Characteristics........................................... 5
8.6 Electrical Characteristics Temperature Lookup Table
(LUT) .......................................................................... 6
8.7 Switching Characteristics .......................................... 7
8.8 Typical Performance Characteristics ....................... 7
9 Detailed Description ............................................ 11
9.1 Overview ................................................................. 11
9.2 Functional Block Diagram ....................................... 11
9.3 Feature Description................................................. 11
9.4 Device Functional Modes........................................ 15
10 Application and Implementation........................ 16
10.1 Application Information.......................................... 16
10.2 Typical Application ................................................ 16
10.3 System Examples ................................................. 21
11 Power Supply Recommendations ..................... 21
12 Layout................................................................... 22
12.1 Layout Guidelines ................................................. 22
12.2 Layout Example .................................................... 22
13 Device and Documentation Support ................. 23
13.1 Related Links ........................................................ 23
13.2 Documentation Support ....................................... 23
13.3 Community Resources.......................................... 23
13.4 Trademarks ........................................................... 23
13.5 Electrostatic Discharge Caution ............................ 23
13.6 Glossary ................................................................ 23
14 Mechanical, Packaging, and Orderable
Information ........................................................... 23
5 Revision History
Changes from Original (March 2015) to Revision A
Page
• Added typical accuracy specification...................................................................................................................................... 1
• Expanded range for ±0.2°C accuracy from "20°C to 90°C" to "-20°C to 90°C". .................................................................... 1
• Added 9.2µA (typ). ................................................................................................................................................................. 1
• Updated schematic ................................................................................................................................................................. 3
• Added -20°C accuracy specification ...................................................................................................................................... 5
• Changed from 20°C to 20°C to 42°C for accuracy specification condition ........................................................................... 5
• Added 50°C accuracy specification ....................................................................................................................................... 5
• Added typical supply current specification.............................................................................................................................. 6
• Changed from 942.547 to 942.552......................................................................................................................................... 6
• Changed from 943.907 to 943.902......................................................................................................................................... 6
• Changed from 890.423 to 890.500......................................................................................................................................... 6
• Changed from 891.934 to 891.857......................................................................................................................................... 6
• Added -20°C histogram curve ................................................................................................................................................ 8
• Removed erroneous 10°C histogram ..................................................................................................................................... 8
• Changed y axis units from (V) to (mV) ................................................................................................................................... 9
• Added Output Noise vs Frequency curve............................................................................................................................. 10
2 Submit Documentation Feedback
Product Folder Links: LMT70 LMT70A
Copyright © 2015, Texas Instruments Incorporated


Features Product Folder Sample & Buy Technical Documents Tools & Software Support & Community LMT70, LMT70A SNIS187A – M ARCH 2015 – REVISED JULY 2015 LMT70, LMT70A ±0.05°C Precision Analog Tempe rature Sensor, RTD and Precision NTC Th ermistor IC 1 Features •1 Accuracy: – ±0.05°C (typ) or ±0.13°C (max) from 20°C to 42°C – ±0.2°C (max) from -20°C to 90°C – ±0.23°C (max ) from 90°C to 110°C – ±0.36°C (m ax) from -55°C to 150°C • Wide Temp erature Range: −55°C to 150°C • M atching of Two Adjacent LMT70A on Tape and Reel: 0.1°C (max) at 30°C • Ver y Linear Analog Temperature Sensor with Output Enable Pin • NTC Output Slope : -5.19 mV/°C • Output On/Off Switch with RDS on < 80 Ω • Wide Power Su pply Range: 2.0 V to 5.5 V • Low Powe r Supply Current: 9.2 µA (typ)12 µA ( max) • Ultra Small 0.88 mm by 0.88 mm 4-bump WLCSP (DSBGA) Package 2 Applica tions • Internet of Things (IoT) Sens or Nodes • Industrial RTD (Class AA) or Precision NTC/PTC Thermistor Replacement • Medical/Fitness Equipment • Medical Thermom.
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