FM51 Low Voltage High Drive Temperature Sensor
April 2001
FM51
Low Voltage High Drive
Temperature Sensor
General Description
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/擄C. It is typically
accurate to
鹵1擄C
over a temperature range of -40擄C to 125擄C and
has a typical room temperature accuracy of
鹵0.5擄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.
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Low Output Impedance for 1mA Load
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Output Ramp is Calibrated in Degrees Celsius
I
Low Operating Current <130碌A(chǔ) (no load)
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Low Self Heating (0.2擄C Max in Still Air)
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Operating Voltage Range: +2.7V to +6.0V
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Uses a Single Positive Supply
I
Non-linearity
鈮?/div>
0.8擄C
Applications
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Computers
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Battery Management
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FAX Machines/Printers/Copiers
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Portable Medical Instruments
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HVAC
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Power Supply Modules
I
Disk Drives
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Automotive Control Circuits
Features
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Precision Calibrated to
鹵1擄C
(Typical)
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Temperature Range: -40擄C to 125擄C
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Extremely Linear Output Ramp (10mV/擄C)
Typical Applications
5V
3.9K
V
TEMP
IN
REF
1.75V
Serial
Analog-to-Digital
Converter
U3
FB
1碌F
10K
Adjustable
Shunt Voltage
Reference
U2
CLOCK
SERIAL
DATA OUT
FM51
U1
100K
ENABLE
Serial Output Temperature to Digital Converter (Full Scale = +125
擄
C)
漏 2001 Fairchild Semiconductor Corporation
FM51 Rev. C
1
www.fairchildsemi.com
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