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SIMISTORTM TEMPERATURE SENSOR ULTRA-LOW-POWER SILICON THERMISTOR
aSM121
New Release 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 highaccuracy 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 nonlinearity. 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 (25C) accuracy of 1C. The aSM121 does not require external calibration - each device is calibrated at the factory.
PRODUCT SPECIFICATION
Pin Configuration
QFN-3
VDD
1
3
GND
aSM121
VOUT
2
Features
* * * * * * * * * Precision Calibrated to 1C at 25C Temperature Range: -30C to 125C Extremely Linear Output Ramp: 10mV/C 0C Output: 0.50V Output Ramp is Calibrated to Degrees Celsius Low Operating Current: 14A Operating Voltage Range: +2.7 V to +3.6V Non-linearity: 0.8C 1.2mm x 1.5mm QFN Package
4 3
Top view, contacts underneath, actual part marking below
Accuracy vs Temperature
Accuracy (C)
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
2 1 0 -1 -2 -3 -4 -40 -20 0 20
25 upper spec limits lower spec limits
125
40
60
80
100 120
Temperature (C)
Ordering Information
Part Number ASM121Q3
m - month / year code
Package 3-Lead QFN
Temperature Range -30C to +125C
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Part Marking Jm
How Supplied 3000 units on T&R
July 2005 - 70A04006
(c) Andigilog, Inc. 2004
aSM121
Absolute Maximum Ratings1
Parameter Supply Voltage Output Voltage Continuous Current, any terminal Storage Temperature Range ESD2 Thermal Resistance - JA Lead Temp Human Body Model Machine Model QFN-3 Rating +7V VDD + 0.5V 10mA -60C to +150C 4000V 400V TBD 260C Notes: 1. Absolute maximum ratings are limits beyond which operation may cause permanent damage to the device. These are stress ratings only; functional operations at or above these limits is not implied. 2. Human Body Model: 100pF capacitor discharged through a 1.5k resistor into each pin. Machine Model: 200pF capacitor discharged directly into each pin. 3. These specifications are guaranteed only for the test conditions listed.
Recommended Operating Ratings
Symbol VDD VOUT TA Parameter Supply Voltage Output Voltage Operating Temperature Range Min +2.7 0 -30 Max +3.6 1.8 +125 Units V V C
Electrical Characteristics3
Limits apply for -40C T A +125C and V D D = + 3 .0V unless otherwise noted.
Parameter Accuracy
4
Symbol
Conditions TA=+25C TA=-30C (TMIN) TA=+125C (TMAX)
Min -1 -4 -3
Typ 0.5 1 1 0.8 14
Max +1 +4 +3
Units C C C C
Non-linearity
5
Supply Current - Output floating Output Sink Capability
6 6
IDD IOL IOH AOUT VOUT0 VOUT25
TA=+25C -30C T A +125C +2.7V < VDD < +3.6V +2.7V < VDD < +3.6V --
15 25 200 10
A A A mV/C mV mV C
Output Source Capability Average Output Slope (Sensor Gain)
Zero-Degree Output Voltage Room Temp Output Voltage Self Heating
7
TA=+0C TA=+25C QFN-3
500 750 0.025
Notes: 4. Accuracy (expressed in C) = Difference between calculated output voltage and measured output voltage. Calculated output voltage = 10mV/C multiplied by device's case temperature at specified conditions of temperature, voltage and power supply with an offset of 500mV (see Fig. 1). 5. Non-linearity is defined as the deviation of the output-voltage-versus-temperature curve from the best-fit straight line, over the device's rated temperature range. 6. Lowest output current should be targeted; higher currents result in more self-heating of the device. 7. Max Self Heating = JA x (VDD x IDD). Assumes a capacitive load.
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(c) Andigilog, Inc. 2004
July 2005 - 70A04006
aSM121
VOUT (mV) 1750 1500 1350 900 750 500 300 200 -30 0 25 50 75 100 125
Temperature (C)
Temp (C) = (VOUT - 500mV) / 10mV/C)
Figure 1. aSM121 Output Voltage vs. Temperature whose temperature is being measured. These printed circuit board lands and traces will not cause the aSM121's temperature to deviate from the desired temperature. Alternatively, the aSM121 can be mounted inside a sealed-end metal tube, and can then be dipped into a bath or screwed into a threaded hole in a tank. As with any IC, the aSM121 and accompanying wiring and circuits must be kept insulated and dry to avoid leakage and corrosion. This is especially true if the circuit may operate at cold temperatures where condensation can occur. Printed-circuit coatings and varnishes such as Humiseal and epoxy paint or dips can be used to ensure that moisture cannot corrode the aSM121 or its connections.
Mounting
The aSM121 package provides good thermal conductivity to the surface to which it is soldered. It's low mass allows it to respond quickly to changes in board temperature. In this case, its temperature will be within about 0.02C of the temperature of the surface it is attached to if the ambient air temperature is almost the same as the surface temperature. If the air temperature is much higher or lower than the surface temperature, the actual temperature of the aSM121 die will be at an intermediate temperature between the surface temperature and the air temperature. To ensure good thermal conductivity, the backside of the aSM121 die is directly attached to the GND pin. The lands and traces to the aSM121 will, of course, be part of the printed circuit board, which is the object
(c) Andigilog, Inc. 2004
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July 2005 - 70A04006
aSM121
Typical Performance Characteristics
16 15 14 13 12
IDD (A)
11 10 9 8 7 -50 -25 0 25 50 50 75
V DD =+3V
100 125
Temperature (C)
Figure 2. aSM121 Current vs Temperature
Typical Applications
3.3V
3.9K VTemp IN Serial REF Analog-to-Digital Converter 1.75V + FB Adjustable Shunt Voltage Reference U2 ENABLE U3 CLOCK
aSM121
U1
SERIAL DATA OUT
100K
10K
Figure 3. Serial Output Temperature to Digital Converter (Full Scale = +125C)
(c) Andigilog, Inc. 2004
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aSM121
Typical Applications (cont.)
3.3V
15K
aSM121
U1 _ U2 5K + 1.75V
IN
8
PARALLEL DATA OUTPUT
Parallel Output Analog-to-Digital Converter VREF INTR
U3 CS 15K RD WR
Figure 4. Parallel Output Temperature to Digital Converter (Full Scale = +125C)
3.3
R3
R4 2.5V Shunt Voltage Reference R1 VT + U1 0.1F R2 - VOUT
U3
3.3
aSM121
U2
VTemp
Figure 5. Thermostat / Fan Controller
(c) Andigilog, Inc. 2004
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July 2005 - 70A04006
aSM121
QFN-3 Package Dimensions and PC Layout Pattern
Ref. Package Outline 0.2 mm + 0.10 -0.0 0.2 mm + 0.10 -0.0 Pin 1 Dot Marking 0.350 0.050 1.000 0.050 Exposed Pad 0.5 mm + 0.10 -0.0 0.350 0.050 0.203 0.025 0.500 0.050 2-PL 1 0.6 mm + 0.10 -0.0
QFN 3L
(1.2mm x 1.5mm)
1.500 0.050 0.200 0.050
1.000 0.050
3 2
0.5 mm + 0.10 -0.0 1.1 mm + 0.10 -0.0
PC Layout Pattern
0.2 mm + 0.10 -0.0
1.200 0.050
1.050 0.050
0.250 0.050
0.200 0.050
0.750 0.025
0.000 0.050
Top View
Bottom View
Side View
Note: Solder mask is recommended to be 0.07mm larger than PC lands.
Figure 6. Package Outline
Tape and Reel Data
4.00 0.10 4.00 0.10
2.00 0.05
AE 1.50 + 0.10 1.75 0.10
8.00 + 0.30 - 0.10
3.50 0.05
SEC - AA
SEC - BB AE 1.00 + 0.25
0.254 0.013 SEC - AA 10 MAX 1.35 0.10 1.02 0.10 1.75 0.10 SEC - BB 10 MAX Part Orientation
Figure 7. Tape Dimensions and Part Orientation
(c) Andigilog, Inc. 2004
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July 2005 - 70A04006
aSM121
Data Sheet Classifications
Preliminary Specification This classification is shown on the heading of each page of a specification for products that are either under development(design and qualification), or in the formative planning stages. Andigilog reserves the right to change or discontinue these products without notice.
New Release Specification This classification is shown on the heading of the first page only of a specification for products that are either under the later stages of development(characterization and qualification), or in the early weeks of release to production. Andigilog reserves the right to change the specification and information for these products without notice.
Fully Released Specification Fully released datasheets do not contain any classification in the first page header. These documents contain specification on products that are in full production. Andigilog will not change any guaranteed limits without written notice to the customers. Obsolete datasheets that were written prior to January 1, 2001 without any header classification information should be considered as obsolete and non-active specifications, or in the best case as Preliminary Specifications.
Andigilog, Inc. 8380 S. Kyrene Rd., Suite 101 Tempe, Arizona 85284-2120 Tel: (480) 940-6200 Fax: (480) 940-4255 (c) Andigilog, Inc. 2004 -7www.andigilog.com July 2005 - 70A04006
aSM121
Notes:
Andigilog, Inc. 8380 S. Kyrene Rd., Suite 101 Tempe, Arizona 85284-2120 Tel: (480) 940-6200 Fax: (480) 940-4255 (c) Andigilog, Inc. 2004 -8www.andigilog.com July 2005 - 70A04006

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