LMT70 Datasheet, PDF (1/29 Pages) Texas Instruments – Precision Analog Temperature Sensor, RTD and Precision NTC Thermistor IC

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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 R_{DS on} < 80 Ω
• 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.