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參數(shù)資料
| 型號： | TMP12FS |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | Airflow and Temperature Sensor |
| 中文描述： | 氣流和溫度傳感器 |
| 文件頁數(shù)： | 7/14頁 |
| 文件大?。?/td> | 446K |
| 代理商： | TMP12FS |
TMP12
REV. 0
–7–
TEMPERATURE –
°
C
36
20
-75
O
-25
25
75
125
175
28
24
32
40
VOL = 1V, V = 5V
22
38
34
30
26
Figure 13. Open-Collector Output Sink Current vs.
Temperature
TEMPERATURE –
°
C
700
0
-75
175
O
-25
25
75
125
600
500
400
300
200
100
a. LOAD = 10mA
c. LOAD = 1mA
b. LOAD = 5mA
a
b
c
V = 5V
Figure 14. Open-Collector Voltage vs. Temperature
APPLICATIONS INFORMATION
A typical application for the TMP12 is shown in Figure 15. The
TMP12 package is placed in the same cooling airflow as a
high-power dissipation IC. The TMP12’s internal resistor pro-
duces a temperature rise which is proportional to air flow, as
shown in Figure 16. Any interruption in the airflow will produce
an additional temperature rise. When the TMP12 chip tempera-
ture 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.
POWER I.C.
PGA
PACKAGE
PGA
SOCKET
PC BOARD
AIR FLOW
TMP12
Figure 15. Typical Application
35
40
45
50
55
60
65
50
100
150
200
250
0
D
°
C
TMP12 P
D
(mW)
a. TMP12 DIE TEMP NO AIR FLOW
b. HIGH SET POINT
c. LOW SET POINT
d. TMP12 DIE TEMP MAX AIR FLOW
e. SYSTEM AMBIENT TEMPERATURE
a
b
c
d
e
Figure 16. 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 compar-
ator will be reset and the output disabled. Hysteresis
prevents “chatter” and “motorboating” in feedback control
systems. For monitoring temperature in computer systems,
hysteresis prevents multiple interrupts to the CPU which
can reduce system performance.
Figure 17 shows the TMP12’s hysteresis profile. The hyster-
esis is programmed, by the user, by setting a specific load
current on the reference voltage output VREF. This output
current, I
REF
, is also called the hysteresis current. I
REF
is mir-
rored internally by the TMP12, as shown in the functional
block diagram, and fed to a buffer with an analog switch.
LO
HI
OUTPUT
VOLTAGE
OVER, UNDER
TEMPERATURE
HYSTERESIS
LOW
HYSTERESIS HIGH =
HYSTERESIS LOW
T
SETLOW
T
SETHIGH
HYSTERESIS
HIGH
Figure 17. TMP12 Hysteresis Profile
After a temperature setpoint has been exceeded and a com-
parator tripped, the hysteresis buffer output is enabled. The
result is a current of the appropriate polarity which gener-
ates a hysteresis offset voltage across an internal 1 k
resistor at the comparator input. The comparator output
remains “on” until the voltage at the comparator input,
now equal to the temperature sensor voltage VPTAT
summed with the hysteresis effect, has returned to the pro-
grammed setpoint voltage. The comparator then returns
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