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PDF FM20 Data sheet ( Hoja de datos )
| Número de pieza | FM20 | |
| Descripción | Ultra-Low-Power Analog Temperature Sensor | |
| Fabricantes | Fairchild Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de FM20 (archivo pdf) en la parte inferior de esta página. Total 9 Páginas | ||
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www.fairchildsemi.com
FM20
Ultra-Low-Power Analog Temperature Sensor
Features
• Analog Output, -11.77mV/°C
• Range, -55 to 130°C
• Accuracy, ±1°C at 25°C
• Supply Current, 9µA typical
• Output Drive, 1µA
• Self-heating < 0.021°C
• Operating Voltage: +2.4V to +6V
Applications
• Mobile Phones
• Computers
• Battery Management
• Office Equipment
• HVAC
• Power Supply Modules
• Disk Drives
• Automotive
Thermal Response
VOUT (mV)
1863.9
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 1µA. For normal operation, the load on VOUT
should be 5MΩ 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 ±1°C at room temperature; and better
than ±2.5°C from 0 to 50°C.
Available packages are surface mount 5-pin SC70 and 3-pin
SOT-23.
-50 -40 -25
391
0 25 50
Temperature (˚C)
75 100
VOUT – 1863.9mV
Temperature (˚C) =
–11.77mV/˚C
125
FM20 Output Voltage vs. Temperature
REV. 1.0.6 1/9/03
1 page  
PRODUCT SPECIFICATION
FM20
In environments that are particularly noisy it may be neces-
sary to add a low-pass filter network to the output of the
device. As shown below, a 1µF capacitor in addition to the
output impedance of the device and a 200Ω 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 recom-
mended.
0.1µF
Bypass
Cap
GND
VDD
VOUT
CFILTER
RFILTER
CL
0.1µF
Bypass
Cap
GND
CFILTER
VDD
VOUT
RFILTER
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
200Ω
470Ω
CFILTER
1µF
0.1µF
680Ω
1000Ω
10kΩ
100kΩ
0.01µF
1000pF
100pF
10pF
REV. 1.0.6 1/9/03
5
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet FM20.PDF ] | |
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