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FM20
Ultra-Low-Power Analog Temperature Sensor
Features
* * * * * * * Analog Output, -11.77mV/C Range, -55 to 130C Accuracy, 1C at 25C Supply Current, 9A typical Output Drive, 1A Self-heating < 0.021C Operating Voltage: +2.4V to +6V
Description
As a precision CMOS temperature sensor, the FM20 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 1A. For normal operation, the load on VOUT should be 5M or less. In a typical application, a remotely mounted FM20 is monitored by a microcontroller with an analog A/D converter input. Alternatively, the FM20 can drive a comparator with a high impedance input. Accuracy is typically 1C at room temperature; and better than 2.5C from 0 to 50C. Available packages are surface mount 5-pin SC70 and 3-pin SOT-23.
Applications
* * * * * * * * Mobile Phones Computers Battery Management Office Equipment HVAC Power Supply Modules Disk Drives Automotive
Thermal Response
VOUT (mV)
1863.9
391 -50 -40 -25 0 25 50 75 100 125
Temperature (C)
Temperature (C) =
VOUT - 1863.9mV -11.77mV/C
FM20 Output Voltage vs. Temperature
REV. 1.0.6 1/9/03
FM20
PRODUCT SPECIFICATION
Pin Assignments
VOUT 3 GND 2 N/C 1 GND 3
FM20
4 VDD 5 GND
FM20
1 VDD 2 VOUT
Pin Descriptions
Pin No. Pin Name SC-70 SOT-23 VOUT 3 2 Type Analog Output Function Temperature Sense. Analog output voltage indicating temperature. VOUT = 1863.9 - 11.77 T(C) mV Supply Voltage. 2.4 to 6.0V Ground.
VDD GND
4 2, 5
1 3
Power Power
2
REV. 1.0.6 1/9/03
PRODUCT SPECIFICATION
FM20
Absolute Maximum Ratings1
Parameter Supply Voltage Output Voltage Output Current Storage Temperature Range Lead Soldering Temperature ESD2 Human Body Model Machine Model Min. Typ. Max. +7 VDD + 0.5 -20/+1 +150 220 2000 250 Units V V A C C V V
-60
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. Human Body Model: 100pF capacitor discharged through a 1.5k resistor into each pin. Machine Model: 200pF capacitor discharged directly into each pin.
Electrical Characteristics3
Limits apply for -55C TA +130C and VDD = +5.0V unless otherwise noted. Parameter Transfer Characteristic Sensitivity Output at 0C Accuracy4 Symbol Conditions Min Typ -11.77 1863.9 1 2 2 Max Units mV/C mV C C C C C mV A mA A k mV/mA pF V A A C C
TA = +25C TA = -55C (TMIN) TA = +130C (TMAX)
Temperature Range Non-Linearity5 Output Output Voltage Range Output Current Source6 Output Current Sink6 Output resistance Load regulation Capacitive Load7 Power Supply Voltage Quiescent Supply Current Output Floating Package Self Heating
-2 -3 -5 -55 -0.5 300
+2 +3 +5 +130 +0.2 2550
IONSN IONSG IOL
VOUT < VDD Sensing Surge TA = 25C
1 20
CL VDD IDD
100 2.4 TA = +25C -55C TA +130C SOT-23 SC70 9 9
1000 6.0 11.5 14 0.02016 0.02082
Notes: 3. These specifications are guaranteed only for the test conditions listed. 4. Accuracy (expressed in C) = Difference between calculated output voltage and measured output voltage. Calculated output voltage = -11.77mV/C multiplied by device's case temperature at specified conditions of temperature, voltage and power supply plus an offset of 1863.9 mV at 0C. 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. High capacitive loads may be driven by the output in a static mode, but it may require a delay time before initial read at power up to allow for the RC time constant of the charging capacitor. REV. 1.0.6 1/9/03
3
FM20
PRODUCT SPECIFICATION
Typical Performance Characteristics
Quiescent Current (A) 12 11 10 9 8 7 6 -50 -25 0 25 50 75 100 125 VDD = +5V
Temperature (C)
Figure 1. Quiescent Current vs. Temperature
3 2 Accuracy (C) 1 0 -1 -2 -3 -4 -5 -50 0 lower spec limit 50 Temperature (C)
VDD =+5V upper spec limit
100
Figure 2. Accuracy vs. Temperature
Applications Information
Mounting
The FM20 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 FM20 die will be at an intermediate temperature between the surface temperature and the air temperature. To ensure good thermal conductivity, the backside of the FM20 die is directly attached to the GND pin. The lands and traces to the FM20 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 FM20's temperature to deviate from the desired temperature. Alternatively, the FM20 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 FM20 and 4 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 FM20 or its connections.
Loading
The FM20 will handle sizable capacitive loads up to 300pF without any special considerations. In an extremely noisy environment it may be advisable to add some filtering to minimize noise in the output voltage. It is also recommended that a 0.1F bypass capacitor be added between the supply voltage and ground. This is due to the instant current demand caused by switching CMOS transistors. Normally it is unadvisable to put a sufficiently large supply (particularly in portable electronics) to be able to handle the dynamic currents of CMOS transistors. It is a much simpler solution to use a bypass capacitor to sustain the supply voltage during this short demand period.
REV. 1.0.6 1/9/03
PRODUCT SPECIFICATION
FM20
In environments that are particularly noisy it may be necessary to add a low-pass filter network to the output of the device. As shown below, a 1F capacitor in addition to the output impedance of the device and a 200 series resistor for a low-pass filter that will pass the slow thermal time con-
stant of the FM20, while filtering the higher frequency noise. The response time of the FM20 can be affected by this filter network, therefore values for CFILTER < 1500pF are recommended.
GND 0.1F Bypass Cap VDD VOUT
CFILTER RFILTER
CL
GND 0.1F Bypass Cap VDD VOUT RFILTER
CFILTER
CL
Figure 3. FM20 with Filter Network for Noisy Environments or for Capacitive Loads Greater than 300pF
Table 1. Resistor/Capacitor Combinations for Filter Network
RFILTER 200 470 680 1000 10k 100k CFILTER 1F 0.1F 0.01F 1000pF 100pF 10pF
REV. 1.0.6 1/9/03
5
FM20
PRODUCT SPECIFICATION
Example Applications Circuits
Typical Applications
5V
3.9K VTemp IN Serial REF Analog-to-Digital Converter 1.75V + FB 1F 10K ENABLE Adjustable Shunt Voltage Reference CLOCK
FM20
SERIAL DATA OUT
100K
Figure 4. Serial Output Temperature to Digital Converter (The full scale of the A-to-D Converter will typically be limited to +125C simply by the number of bits available in the conversion. The FM20 would still be capable of its full output swing.)
5V
30K
VTemp
FM20
IN
8
PARALLEL DATA OUTPUT
_ VREF 5K 1F + 1.75V
Parallel Output Analog-to-Digital Converter
INTR
CS 15K RD WR
Figure 5. Parallel Output Temperature to Digital Converter (Full Scale = +125C)
6
REV. 1.0.6 1/9/03
PRODUCT SPECIFICATION
FM20
Typical Applications (continued)
V+
RHYST
RV+ VREF Shunt Voltage Reference RVD1 VTRIP VCONTROL RVD2
0.1F
V+
FM20
VOUT
VHYST2 = VHYST2 VHYST1 VOUT VCONTROL VHYST1 =
(VREF) * (RVD2) (RVD2) * (RHYST) RVD1 + RHYST + RVD2
(VREF) * (RVD2) RVD2 + (RVD1) * (RHYST) RHYST + RVD1
VREF is set by the Shunt Voltage Reference. VCONTROL high is an alarm state or control for activating cooling/fan.
Figure 6. Thermostat/Fan Controller
GND
CFILTER 0.1F Bypass Cap
FM20
VOUT
RFILTER
Microcontroller
Analog to Digital Converter
VDD
Figure 7. Digital Temperature Output Through a Microcontroller
REV. 1.0.6 1/9/03
7
FM20
PRODUCT SPECIFICATION
Mechanical Dimensions inches (millimeters) unless otherwise noted
SOT-23 FS Package Code MA03A
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
SC70 5-pin FS Package Code MAA05A
0.65
-A-
2.000.20 0.65
.5 min
5
4
-B- 1.250.10
1.9 2.100.10
1
2
3 0.4 min LAND PATTERN RECOMMENDATION SEE DETAIL A
0.25
+0.10 0.20 -0.05
max 0.1 M
0.9.10
0.95.15
0.25 0.10
0.10 0.00
max 0.1
6.00 R0.14 GAGE PLANE R0.10 0-30 6.00 0.45 0.10 0.425 NOMINAL DETAIL A
0.20
NOTES: A. CONFORMS TO EIAJ REGISTERED OUTLINE DRAWING SC88A. B. DIMENSIONS DO NOT INCLUDE BURRS OR MOLD FLASH. C. DIMENSIONS ARE IN MILLIMETERS.
8
REV. 1.0.6 1/9/03
FM20
PRODUCT SPECIFICATION
Ordering Information
Part Number FM20P5X FM20S3X Package 5-Pin SC70 3-Pin SOT-23 Temperature Range -55C to +130C -55C to +130C 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 1/9/03 0.0m 003 Stock#DS30000020 2002 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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