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TMP12 bảng dữ liệu(PDF) 5 Page - Analog Devices

tên linh kiện TMP12
Giải thích chi tiết về linh kiện  Airflow and Temperature Sensor
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TMP12 bảng dữ liệu(HTML) 5 Page - Analog Devices

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REV. B
–5–
TMP12
SUPPLY VOLTAGE (V)
500
0
450
400
350
300
250
200
150
100
50
0
12345678
TA = 25 C
NO LOAD
HEATER OFF
TPC 10. Supply Current vs. Supply
Voltage
TEMPERATURE ( C)
0.5
–75
0.4
0.3
0.2
0.1
0
–25
25
75
125
175
V+ = 4.5V TO 5.5V
NO LOAD
HEATER OFF
TPC 11. VPTAT Power Supply
Rejection vs. Temperature
TEMPERATURE ( C)
40
–75
36
32
28
24
20
–25
25
75
125
175
38
34
30
26
22
VOL = 1V
V+ = 5V
TPC 12. Open-Collector Output Sink
Current vs. Temperature
APPLICATIONS INFORMATION
A typical application for the TMP12 is shown in Figure 2. The
TMP12 package is placed in the same cooling airflow as a high
power dissipation IC. The TMP12’s internal resistor produces a
temperature rise that is proportional to air flow, as shown in
Figure 3. Any interruption in the air flow will produce an addi-
tional temperature rise. When the TMP12 chip temperature
exceeds a user-defined setpoint limit, the system controller can
take corrective action, such as reducing clock frequency, shutting
down unneeded peripherals, turning on additional fan cooling,
or shutting down the system.
PGA
PACKAGE
PGA
SOCKET
POWER IC
AIR FLOW
PC BOARD
TMP12
Figure 2. Typical Application
TEMPERATURE ( C)
700
–75
500
300
100
–25
25
75
125
175
600
400
200
0
LOAD = 10mA
LOAD = 5mA
LOAD = 1mA
TPC 13. Open-Collector Voltage vs.
Temperature
TMP12 PD (mW)
65
60
35
0
250
50
100
150
200
55
50
45
40
A
B
C
D
E
A. TMP12 DIE TEMP NO AIR FLOW
B. HIGH SETPOINT
C. LOW SETPOINT
D. TMP12 DIE TEMP MAX AIR FLOW
E. SYSTEM AMBIENT TEMPERATURE
Figure 3. Choosing Temperature Setpoints
Temperature Hysteresis
The temperature hysteresis at each setpoint is the number of
degrees beyond the original setpoint temperature that must be
sensed by the TMP12 before the setpoint comparator will be
reset and the output disabled. Hysteresis prevents chatter and
motorboating in feedback control systems. For monitoring tem-
perature in computer systems, hysteresis prevents multiple
interrupts to the CPU which can reduce system performance.


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