TMP12FS Fast Delivery |IC PHOENIX CO.,LIMITED

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TMP12FS
Airflow and Temperature Sensor

SETPOINT INPUTS
VREF OUTPUT
OPEN-COLLECTOR OUTPUTS
HEATER
POWER SUPPLY
NOTESGuaranteed but not tested.TMP12 is specified for operation from a 5 V supply. However, operation is allowed up to a 12 V supply, but not tested at 12 V. Maximum heater supply is 6 V.
Specifications subject to change without notice.
TMP12–SPECIFICATIONS
(VS = 15 V, 240°C ≤ TA ≤ 1125°C unless otherwise noted.)
20pF
1kΩ
TEST LOAD
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000V readily
accumulate on the human body and test equipment and can discharge without detection.
TMP12
ACCURACY
SETPOINT INPUTS
VREF OUTPUT
OPEN-COLLECTOR OUTPUTS
HEATER
POWER SUPPLY
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 3 0.071 inch, 5,538 sq. mils
(1.98 3 1.80 mm, 3.57 sq. mm)
Transistor Count: 105
WAFER TEST LIMITS(VS = 15 V, GND = O V, TA = 125°C, unless otherwise noted.)VREFSET HIGH INPUT
3. SET LOW INPUT
4. GND
5. HEATERUNDER OUTPUTOVER OUTPUTV1
For additional DICE ordering information, refer to databook.
TMP12
ABSOLUTE MAXIMUM RATINGS*
Supply Voltage. . . . . . . . . . . . . . . . . . . . . . . . 20.3 V to 115 V
Heater Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 V
Setpoint Input Voltage. . . . . . . . . . . 20.3 V to [(V1) 10.3 V]
Reference Output Current. . . . . . . . . . . . . . . . . . . . . . . . 2 mA
Open-Collector Output Current. . . . . . . . . . . . . . . . . . 50 mA
Open-Collector Output Voltage. . . . . . . . . . . . . . . . . . . 115 V
Operating Temperature Range. . . . . . . . . . 255°C to 1150°C
Dice Junction Temperature. . . . . . . . . . . . . . . . . . . . . 1175°C
Storage Temperature Range. . . . . . . . . . . . 265°C to 1160°C
Lead Temperature(Soldering, 60 sec). . . . . . . . . . . . . 1300°C
8-Pin Plastic DIP (P)
NOTESΘJA is specified for device in socket (worst case conditions).ΘJA is specified for device mounted on PCB.
CAUTIONStresses above those listed under “Absolute Maximum
Ratings” may cause permanent damage to the device. This is a
stress rating only and functional operation at or above this
specification is not implied. Exposure to the above maximum
rating conditions for extended periods may affect device reli-
ability.Digital inputs and outputs are protected, however, permanent
damage may occur on unprotected units from high-energy
electrostatic fields. Keep units in conductive foam or packaging
at all times until ready to use. Use proper antistatic handling
procedures.Remove power before inserting or removing units from their
sockets.
ORDERING GUIDE
NOTEXIND = 240°C to 1125°C
FUNCTIONAL DESCRIPTION
The TMP12 incorporates a heating element, temperature sen-
sor, and two user-selectable setpoint comparators on a single
substrate. By generating a known amount of heat, and using the
setpoint comparators to monitor the resulting temperature rise,
the TMP12 can indirectly monitor the performance of a
system’s cooling fan.
The TMP12 temperature sensor section consists of a bandgap
voltage reference which provides both a constant 2.5 V output
and a voltage which is proportional to absolute temperature
(VPTAT). The VPTAT has a precise temperature coefficient of
5 mV/K and is 1.49 V (nominal) at 125°C. The comparators
compare VPTAT with the externally set temperature trip points
and generate an open-collector output signal when one of their
respective thresholds has been exceeded.
The heat source for the TMP12 is an on-chip 100 Ω low
tempco thin-film resistor. When connected to a 5 V source, this
resistor dissipates:D =V2
52 V
100 Ω
= 0.25 W ,=
which generates a temperature rise of about 32°C in still air for
the SO packaged device. With an airflow of 450 feet per minute
(FPM), the temperature rise is about 22°C. By selecting a temp-
erature setpoint between these two values, the TMP12 can provide
a logic-level indication of problems in the cooling system.
A proprietary, low tempco thin-film resistor process, in conjunc-
tion with production laser trimming, enables the TMP12 to
provide a temperature accuracy of 63°C (typ) over the rated
temperature range. The open-collector outputs are capable of
sinking 20 mA, allowing the TMP12 to drive small control re-
lays directly. Operating from a single 15 V supply, the quiescent
current is only 600 μA (max), without the heater resistor current.
HEATER RESISTOR POWER DISSIPATION – mW50100150200
JUNCTION TEMPERATURE RISE ABOVE AMBIENT –
250
Figure 1.SOIC Junction Temperature Rise vs. Heater
Dissipation
HEATER RESISTOR POWER DISSIPATION – mW
JUNCTION TEMPERATURE RISE ABOVE AMBIENT – 25025050100150200
Figure 2.PDIP Junction Temperature Rise vs. Heater
Dissipation
TIME – sec102030405060708090100110120130
JUNCTION TEMPERATURE –
AIR VELOCITY – FPM
TIME CONSTANT – sec
100
Figure 4.Package Thermal Time Constant in Forced Air
TIME – sec
JUNCTION TEMPERATURE – 8101214161820
120
Figure 5.Thermal Response Time in Stirred Oil Bath
TEMPERATURE – °C
HEATER RESISTANCE –
100.5
TMP12
TEMPERATURE – °C
REFERENCE VOLTAGE – V
2.495
Figure 7.Reference Voltage vs. Temperature
TEMPERATURE – °C
START-UP SUPPLY VOLTAGE – V
3.5
Figure 8.Start-up Voltage vs. Temperature
TEMPERATURE – °C
SUPPLY CURRENT – µA
-252575125
Figure 9.Supply Current vs. Temperature
TEMPERATURE – °C
ACCURACY ERROR – 50100
Figure 10.Accuracy Error vs. Temperature
SUPPLY VOLTAGE – V
SUPPLY CURRENT – µA4567
Figure 11.Supply Current vs. Supply Voltage
TEMPERATURE – °C
POWER SUPPLY REJECTION –
C/V
0.5
Figure 12.VPTAT Power Supply Rejection vs.
Temperature
TEMPERATURE – °C
OPEN COLLECTOR SINK CURRENT – mA
-252575125175
Figure 13.Open-Collector Output Sink Current vs.
Temperature
TEMPERATURE – °C
OPEN–COLLECTOR OUTPUT VOLTAGE – mV
100
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 Application1001502002500
DIE TEMPERATURE (
TMP12 PD (mW)
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, IREF, is also called the hysteresis current. IREF is mir-
rored internally by the TMP12, as shown in the functional
block diagram, and fed to a buffer with an analog switch.
OUTPUT
VOLTAGE
OVER, UNDER
TEMPERATURE
TSETLOWTSETHIGH
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 kΩ
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-

Partno	Mfg	Dc	Qty	Available	Descript
TMP12FS	AD	N/a	1543	avai	Airflow and Temperature Sensor
TMP12FS	ADI	N/a	11	avai	Airflow and Temperature Sensor