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TMP12FS の電気的特性と機能

TMP12FSのメーカーはAnalog Devicesです、この部品の機能は「Airflow and Temperature Sensor」です。


製品の詳細 ( Datasheet PDF )

部品番号 TMP12FS
部品説明 Airflow and Temperature Sensor
メーカ Analog Devices
ロゴ Analog Devices ロゴ 




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TMP12FS Datasheet, TMP12FS PDF,ピン配置, 機能
a
Airflow and Temperature Sensor
FEATURES
Temperature Sensor Includes 100 Heater
Heater Provides Power IC Emulation
Accuracy ؎3°C typ. from ؊40°C to ؉100°C
Operation to ؉150°C
5 mV/°C Internal Scale-Factor
Resistor Programmable Temperature Setpoints
20 mA Open-Collector Setpoint Outputs
Programmable Thermal Hysteresis
Internal 2.5 V Reference
Single 5 V Operation
400 µA Quiescent Current (Heater OFF)
Minimal External Components
APPLICATIONS
System Airflow Sensor
Equipment Over-Temperature Sensor
Over-Temperature Protection
Power Supply Thermal Sensor
Low-Cost Fan Controller
GENERAL DESCRIPTION
The TMP12 is a silicon-based airflow and temperature sensor
designed to be placed in the same airstream as heat generating
components that require cooling. Fan cooling may be required
continuously, or during peak power demands, e.g. for a power
supply, and if the cooling systems fails, system reliability and/or
safety may be impaired. By monitoring temperature while emu-
lating a power IC, the TMP12 can provide a warning of cooling
system failure.
The TMP12 generates an internal voltage that is linearly pro-
portional to Celsius (Centigrade) temperature, nominally
؉5 mV/°C. The linearized output is compared with voltages
from an external resistive divider connected to the TMP12’s
2.5 V precision reference. The divider sets up one or two refer-
ence voltages, as required by the user, providing one or two
temperature setpoints. Comparator outputs are open-collector
transistors able to sink over 20 mA. There is an on-board hys-
teresis generator provided to speed up the temperature-setpoint
output transitions, this also reduces erratic output transitions in
noisy environments. Hysteresis is programmed by the external
resistor chain and is determined by the total current drawn from
the 2.5 V reference. The TMP12 airflow sensor also incorpo-
rates a precision, low temperature coefficient 100 heater
resistor that may be connected directly to an external 5 V sup-
ply. When the heater is activated it raises the die temperature in
TMP12*
FUNCTIONAL BLOCK DIAGRAM
VREF
SET
HIGH
SET
LOW
GND
HYSTERESIS
CURRENT
CURRENT
MIRROR
IHYS
WINDOW
COMPARATOR
VOLTAGE
REFERENCE
AND
SENSOR
1k
-
+
+
-
HYSTERESIS
VOLTAGE
100
V+
OVER
UNDER
HEATER
PINOUTS
DIP And SO
VREF 1
8 V+
SET HIGH 2
SET LOW 3
TOP VIEW
(Not to Scale)
7 OVER
6 UNDER
GND 4
5 HEATER
the DIP package approximately 20°C above ambient (in still
air). The purpose of the heater in the TMP12 is to emulate a
power IC, such as a regulator or Pentium CPU which has a high
internal dissipation.
When subjected to a fast airflow, the package and die tempera-
tures of the power device and the TMP12 (if located in the
same airstream) will be reduced by an amount proportional to
the rate of airflow. The internal temperature rise of the TMP12
may be reduced by placing a resistor in series with the heater, or
reducing the heater voltage.
The TMP12 is intended for single 5 V supply operation, but will
operate on a 12 V supply. The heater is designed to operate from
5 V only. Specified temperature range is from ؊40°C to ؉125°C,
operation extends to ؉150°C at 5 V with reduced accuracy.
The TMP12 is available in 8-pin plastic DIP and SO packages.
*Protected by U.S. Patent No. 5,195,827.
REV. 0
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
© Analog Devices, Inc., 1995
One Technology Way, P.O. Box 9106, Norwood. MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703

1 Page





TMP12FS pdf, ピン配列
TMP12
WAFER TEST LIMITS (VS = ؉5 V, GND = O V, TA = ؉25°C, unless otherwise noted.)
Parameter
Symbol Conditions
Min Typ Max Units
ACCURACY
Accuracy (High, Low Setpoints)
Internal Scale Factor
TA = ؉25°C
TA = ؉25°C
؉4.9 ؉5
؎3 °C
؉5.1 mV/°C
SETPOINT INPUTS
Input Bias Current
IB
100 nA
VREF OUTPUT
Output Voltage
VREF
TA = ؉25°C, No Load 2.49
2.51 V
OPEN-COLLECTOR OUTPUTS
Output Low Voltage
Output Leakage Current
VOL ISINK = 1.6 mA
IOH VS = 12 V
0.4 V
100 µA
HEATER
Resistance
RH TA = ؉25°C
97 100 103
POWER SUPPLY
Supply Range
Supply Current
؉VS 4.5
ISY Unloaded at ؉5 V
5.5 V
600 µA
NOTE
Electrical tests are performed at wafer probe to the limits shown. Due to variations in assembly methods and normal yield loss, yield after packaging is not guaranteed
for standard product dice. Consult factory to negotiate specifications based on dice lot qualification through sample lot assembly and testing.
DICE CHARACTERISTICS
Die Size 0.078 ؋ 0.071 inch, 5,538 sq. mils
(1.98 ؋ 1.80 mm, 3.57 sq. mm)
Transistor Count: 105
8 76
1 23
5
1. VREF
2. SET HIGH INPUT
3. SET LOW INPUT
4. GND
5. HEATER
6. UNDER OUTPUT
7. OVER OUTPUT
8. V؉
4
For additional DICE ordering information, refer to databook.
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection.
Although the TMP12 features proprietary ESD protection circuitry, permanent damage may
occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD
precautions are recommended to avoid performance degradation or loss of functionality.
REV. 0
–3–
WARNING!
ESD SENSITIVE DEVICE


3Pages


TMP12FS 電子部品, 半導体
TMP12
2.52
2.515
V = 5V, NO LOAD, HEATER OFF
2.51
2.505
2.5
2.495
2.49
-75
-25 25 75 125
TEMPERATURE – °C
Figure 7. Reference Voltage vs. Temperature
175
5
START-UP VOLTAGE DEFINED AS OUTPUT
READING BEING WITHIN 5 °C OF OUTPUT AT 5V
4.5
NO LOAD, HEATER OFF
4
3.5
3
-75 -25 25 75 125
TEMPERATURE – °C
Figure 8. Start-up Voltage vs. Temperature
175
500
V = 5V, NO LOAD, HEATER OFF
475
450
425
400
375
350
325
300
-75
-25 25 75 125
TEMPERATURE – °C
Figure 9. Supply Current vs. Temperature
175
6
5
4
3
2
1
0
-1
-2
-3
-4
-5
-6
-50
-25
a. MAXIMUM LIMIT
b. ACCURACY ERROR
b a c. MINIMUM LIMIT
c
0 25 50 75 100 125
TEMPERATURE – °C
Figure 10. Accuracy Error vs. Temperature
500
450
400
350
300
250
200
150
Ta = 25°C, NO LOAD, HEATER OFF
100
50
0
01 23 45 67 8
SUPPLY VOLTAGE – V
Figure 11. Supply Current vs. Supply Voltage
0.5
V = 4.5 TO 5.5V
0.4
NO LOAD, HEATER OFF
0.3
0.2
0.1
0
-75 -25 25
75 125
TEMPERATURE – °C
Figure 12. VPTAT Power Supply Rejection vs.
Temperature
175
–6– REV. 0

6 Page



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共有リンク

Link :


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