FM51 Fairchild Semiconductor, FM51 Datasheet

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FM51

Manufacturer Part Number
FM51
Description
Low Voltage High Drive Temperature Sensor
Manufacturer
Fairchild Semiconductor
Datasheet

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© 2001 Fairchild Semiconductor Corporation
FM51 Rev. C
The FM51 is a high-precision CMOS temperature sensor that
provides a cost-effective solution for applications requiring high-
accuracy temperature monitoring. The FM51 is ideally suited for
applications requiring high drive current. The FM51 output voltage
ramp is extremely linear and has a slope of 10mV/°C. It is typically
accurate to ±1°C over a temperature range of -40°C to 125°C and
has a typical room temperature accuracy of ±0.5°C. The output
voltage characteristic for the FM51 is illustrated in Figure 1.
The FM51 does not require external calibration. Factory calibra-
tion of the FM51 is performed using a low-cost trimming technique.
The FM51 is available in 3-pin SOT-23 surface mount packages.
I Precision Calibrated to ±1°C (Typical)
I Temperature Range: -40°C to 125°C
I Extremely Linear Output Ramp (10mV/°C)
U1
1µF
100K
10K
V
TEMP
FB
5V
3.9K
Shunt Voltage
Adjustable
Reference
I Low Output Impedance for 1mA Load
I Output Ramp is Calibrated in Degrees Celsius
I Low Operating Current <130µA (no load)
I Low Self Heating (0.2°C Max in Still Air)
I Operating Voltage Range: +2.7V to +6.0V
I Uses a Single Positive Supply
I Non-linearity ≤ 0.8°C
I Computers
I Battery Management
I FAX Machines/Printers/Copiers
I Portable Medical Instruments
I HVAC
I Power Supply Modules
I Disk Drives
I Automotive Control Circuits
1.75V
REF
IN
U2
Analog-to-Digital
Converter
Serial
U3
°
www.fairchildsemi.com
SERIAL
DATA OUT
CLOCK
ENABLE
April 2001

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FM51 Summary of contents

Page 1

... The output voltage characteristic for the FM51 is illustrated in Figure 1. The FM51 does not require external calibration. Factory calibra- tion of the FM51 is performed using a low-cost trimming technique. The FM51 is available in 3-pin SOT-23 surface mount packages. I Precision Calibrated to ±1°C (Typical) I Temperature Range: -40° ...

Page 2

... V TEMP U1 5K 1µ 4.1V Shunt Voltage U3 Reference V+ FM51 Rev 30K IN Parallel Output Analog-to-Digital Converter - V U2 REF + 1.75V 15K 0.1µ TEMP U2 PARALLEL 8 DATA OUTPUT INTR ° OUT + www.fairchildsemi.com ...

Page 3

... 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. FM51 Rev. C 3-Pin SOT-23 -40°C to +125°C ...

Page 4

... Alternatively, the FM51 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 FM51 and accompa- nying wiring and circuits must be kept insulated and dry to avoid leak1ge and corrosion. This is especially true if the circuit may operate at cold temperatures where condensation can occur ...

Page 5

... GND FM51 V V OUT DD FM51 Rev. C upper spec limit lower spec limit - Temperature ( FM51 GND V = +5V DD 100 150 Analog to Digital V OUT Converter www.fairchildsemi.com ...

Page 6

... Deutsch English Français Italiano Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and Fairchild reserves the right at any time without notice to change said circuitry and specifications. FM51 Rev. C 0.40 ±0.03 0.96~1.14 0.508REF 2. A critical component is any component of a life support device ...

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