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FM50
Analog Temperature Sensor
Features
* * * * * * * Analog output: 10 mV/C Range: -40 to 125C range: Accuracy: 2C at 25C Supply Current, 170 A max. Output Drive, 25 A Self-heating < 0.1C Operating Voltage: +2.4V to +6V
Description
As a precision CMOS temperature sensor, the FM50 is cost-effective for accurate low-power temperature monitoring applications. Output voltage versus temperature is extremely linear. With no load, the supply current is typically 130A. For normal operation, the load on V OUT should be 100K or less. In a typical application, a remotely mounted FM50 is monitored by a microcontroller with an analog A/D converter input. Alternatively, the FM50 can drive a comparator with a high impedance input. Accuracy is typically 0.5C at room temperature; and better than 2C from 0 to 75C. Available in both standard and Lead Free 3-pin SOT-23 package.
Applications
* * * * * * * * Mobile Phones Computers Battery Management Office Equipment HVAC Power Supply Modules Disk Drives Automotive
Thermal Response
VOUT (mV)
1750
750 500
100 -50 -40 -25 0 25 50 75 100 125
Temperature ( C)
Temperature ( C) =
VOUT - 500 mV 10 mV/ C
FM50 Output Voltage vs. Temperature
REV. 1.1.0 10/5/04
FM50
PRODUCT SPECIFICATION
Pin Assignments
GND
3
FM50
1 2
VDD
VOUT
Pin Descriptions
Pin Name Pin No. VOUT VDD GND 2 1 3 Type Analog Output Power Power Function Temperature Sense. Analog output voltage indicating temperature. VOUT = 500+10T(C) mV Supply Voltage. 2.4 to 6.0V Ground.
2
REV. 1.1.0 10/5/04
PRODUCT SPECIFICATION
FM50
Absolute Maximum Ratings1
Parameter Supply Voltage Output Voltage Output Current Operating Temperature Range2 -50 -60 Storage Temperature Range Lead Soldering Temperature ESD2 Human Body Model Machine Model Min. Typ. Max. +7 VDD + 0.5 10 +150 +150 220 2000 250 Units V V A C C C V V
Notes: 1. Absolute maximum ratings are limits beyond which operation may cause permanent damage to the device. These are stress ratings only; functional operation at or above these limits is not implied. 2. Operating ratings are conditions for which the device is intended to be functional without specific guaranteed performance limits. For guaranteed specifications and test conditions refer to Electrical Characteristics. 3. Human Body Model: 100pF capacitor discharged through a 1.5kOhm resistor into each pin. Machine Model: 200pF capacitor discharged directly into each pin.
Electrical Characteristics4
Limits apply for -40C TA +125C and VDD = +5.0V unless otherwise noted. Parameter Transfer Characteristic Sensitivity Output at 25C Accuracy5 Symbol AOUT TA = +25C TA = -40C (TMIN) TA = +125C (TMAX) Conditions Min 9.7 740 -2 -3.5 -3 -40 -0.8 100 IONSN IONSG IOL Sensing Surge 100k load at 25C 1 25 50 10 Typ 10 750 0.5 1 1 Max 10.3 760 +2 +3.5 +3 +125 +0.8 1750 Units mV/C mV C C C C C mV A mA A k mV/mA V A C/W
Temperature Range Non-Linearity6 Output Output Voltage Range Output Current Source Output Current Sink Output resistance Load regulation Power Supply Voltage Quiescent Current Package Thermal Resistance
VDD IS
2.4 No output load 260
6.0 170
Notes: 4. These specifications are guaranteed only for the test conditions listed. 5. Accuracy (expressed in C) = Difference between calculated output voltage and measured output voltage. Calculated output voltage = 10mV/C multiplied by the device's case temperature at specified conditions of temperature, voltage and power supply, added to 500mV. 6. 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.
REV. 1.1.0 10/5/04
3
FM50
PRODUCT SPECIFICATION
Typical Performance Characteristics
4.0 3.0 2.0 upper spec limit VDD = +5V
Accuracy (C)
1.0 0.0 -1.0 -2.0 -3.0 lower spec limit -4.0 -50 0 50 100 150
Temperature (C)
Figure 1. Accuracy vs. Temperature
VOUT Deviation from 5V Value (mV)
140.0 120.0 5.0 4.0 3.0 2.0 1.0 0.0 -1.0 2.5
Supply Current (uA)
100.0 80.0 60.0 40.0 20.0 0.0 -50
-30
-10
10
30
50
70
90
110
130
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
Temperature (C)
VDD Volts
Figure 2. Typical IDD versus Temperature
Figure 3. Typical Sensitivity to Supply Voltage
Description
Within the FM50 are a thermal diode, calibration circuits and amplifiers. Since the FM50 is calibrated at 33C, the nominal output in mV is:
V OUT = 830 + 10 * ( T - 33 )
These values accommodate the specified accuracies at -40, 25 and +125C. Output structure of the FM50 is an n-channel CMOS transistor driving a p-channel load. Available current is typically 50 A to ground. Series resistance is typically 7 k , charging and 2 k, discharging through a capacitor connected from VOUT to ground. Following application of power to VDD, VOUT is accurate following a delay of approximately 80 msec.
where T is the thermal junction temperature expressed in C. At 33C, the tolerances are as follows: 1. 2. Offset is 3mV Slope, 0.3mV/C
4
REV. 1.1.0 10/5/04
PRODUCT SPECIFICATION
FM50
Applications Information
Although the FM50 is a simple device, care must be taken to ensure that temperature is measured accurately. There are two major sources of errors: 3. 4. 5. Voltage errors. Thermal Delay Errors. Location errors
Location Errors
Position is another source of error. Even within a controlled thermal environment, changing location by a few inches can lead to errors of several tenths of 1C
Mounting
The FM50 can be easily mounted by gluing or cementing it to a surface. In this case, its temperature will be within about 0.2C 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 FM50 die will be at an intermediate temperature between the surface temperature and the air temperature.
Voltage Errors
VDD
FM50
VOUT
GND(power)
GND(sense)
Figure 4. Recommended Electrical Connections
To ensure good thermal conductivity, the backside of the FM50 die is directly attached to the GND pin. The lands and traces to the FM50 will, of course, be part of the printed circuit board, which is the object whose temperature is being measured. These printed circuit board lands and traces will not cause the FM50's temperature to deviate from the desired temperature. Alternatively, the FM50 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 FM50 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 FM50 or its connections.
A Kelvin connection is recommended to avoid errors due to voltage drops in the ground connections. Although the typical 130A supply current draw of the FM50 will only cause a 130V error if the series resistance is 1 , a 100 mA current supply to adjacent circuits can cause a 10mV drop across 100m (10m is a typical value for soldered joints or contact resistance), leading to a 1C error. For this reason, the FM50 should be Kelvin connected as shown in Figure 4.
Thermal Delay Errors
For measurement accuracy of the order of tenths of 1C, adequate settling time must be allowed. For a typical circuit board installation, 15 minutes should be allowed to elapse following reading of temperature within 1 - 2C of the expected final value. Once VOUT has ceased to slew and is stable (with or without about 0.1C noise) for about 5 minutes, temperature can be calculated.
REV. 1.1.0 10/5/04
5
FM50
PRODUCT SPECIFICATION
Typical Applications Circuits
3.9K VTEMP IN REF 1.75V Serial Analog-to-Digital Converter U3 FB 1F 10K Adjustable Shunt Voltage Reference U2 CLOCK SERIAL DATA OUT
FM50
U1 100K
ENABLE
Figure 4. Serial Output Temperature to Digital Converter (Full Scale = +125C)
5V
30K VTEMP U1 5K 1F + U2 1.75V VREF U3 CS RD 15K WR 8 IN Parallel Output Analog-to-Digital Converter PARALLEL DATA OUTPUT
FM50
INTR
Figure 5. Parallel Output Temperature to Digital Converter (Full Scale = +125C)
6
REV. 1.1.0 10/5/04
PRODUCT SPECIFICATION
FM50
Typical Applications (continued)
V+ R3
R4 R1 4.1V
Shunt Voltage Reference
VT 0.1F R2
U1 VOUT
U3
+
V+
FM50
U2
VTEMP
Figure 6. Thermostat/Fan Controller
REV. 1.1.0 10/5/04
7
FM50
PRODUCT SPECIFICATION
Mechanical Dimensions inches (millimeters) unless otherwise noted
SOT-23 FS Package Code AU
0.110 (2.800) 0.120 (3.040)
0.047 (1.20) 0.055 (1.40)
0.083 (2.100) 0.104 (2.640)
PIN 1 0.035 (0.890) 0.041 (1.030) 0.070 (1.780) 0.081 (2.050) 0.017 (0.450) 0.024 (0.600)
0.035 (0.890) 0.044 (1.120) 10 0
0.0005 (0.013) 0.004 (0.100)
0.015 (0.370) 0.020 (0.510)
SEATING PLANE
0.015 (0.085) 0.007 (0.180)
0.0217 REF (0.55) REF
Ordering Information
Part Number FM50S3X FM50S3X_NL Package 3-Pin SOT-23 3-Pin SOT-23 Temperature Range -40C to +125C -40C to +125C Shipping Tape and Reel, 3000 units/reel Tape and Reel, 3000 units/reel
DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. LIFE SUPPORT POLICY FAIRCHILD'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user.
www.fairchildsemi.com 10/5/04 0.0m 003 Stock#DS30000050 2004 Fairchild Semiconductor Corporation
2. A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.

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