New Release Specification
© Andigilog, Inc. 2004
www.andigilog.com
July 2005 - 70A04006
SIMISTOR™ TEMPERATURE SENSOR
ULTRA-LOW-POWER SILICON THERMISTOR
aSM121
PRODUCT SPECIFICATION
General Description
The aSM121 is a high-precision, 3-lead CMOS silicon
thermistor in an ultra-small leadless package that provides
a cost-effective solution for applications requiring high-
accuracy low-power temperature monitoring. The aSM121
functions in a way that is similar to a PTC thermistor.
However, it is linear-calibrated, enabling application
developers to directly interpret output voltage as
temperature without complex compensation for non-
linearity.
The aSM121 output voltage ramp has a positive slope of
10mV/°C that is independent of supply voltage. The
aSM121 has a guaranteed room temperature (25°C)
accuracy of ±1°C. The aSM121 does not require external
calibration - each device is calibrated at the factory.
Features
•
Precision Calibrated to ±1°C at 25°C
•
Temperature Range: -30°C to 125°C
•
Extremely Linear Output Ramp: 10mV/°C
•
0
°C Output: 0.50V
•
Output Ramp is Calibrated to Degrees Celsius
•
Low Operating Current: 14
μA
•
Operating Voltage Range: +2.7 V to +3.6V
•
Non-linearity: ≤ 0.8
°C
•
1.2mm x 1.5mm QFN Package
Applications
•
Mobile Phones
•
Mobile Communications Terminals
•
Computers
•
Battery Management
•
FAX Machines/Printers/Copiers
•
Portable Medical Instruments
•
HVAC, Power Supply Modules
•
Disk Drives
•
Automotive Control Circuits
Pin Configuration
GND
V
OUT
1
aSM121
V
DD
QFN-3
2
3
GND
V
OUT
1
aSM121
V
DD
QFN-3
2
3
Top view, contacts underneath,
actual part marking below
Accuracy vs Temperature
Temperature (°C)
-3
-2
-1
0
1
2
3
upper spec limits
0
80
100
lower spec limits
-
-
-
25
120
125
60
40
20
-20
-40
4
-4
Temperature (°C)
-3
-2
-1
0
1
2
3
upper spec limits
0
80
100
lower spec limits
-
-
-
25
120
125
60
40
20
-20
-40
4
-4
Ordering Information
Part Number
Package
Temperature Range
Part Marking
How Supplied
aSM121Q3
3-Lead QFN
-30˚C to +125˚C
Jm
3000 units on T&R
m – month / year code
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