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TMP01ES-tmp01fp-TMP01FS
Low Power, Programmable Temperature Controller
FUNCTIONAL BLOCK DIAGRAM
REV.CLow Power, Programmable
Temperature Controller
FEATURES
–558C to +1258C (–678F to +2578F) Operation
61.08C Accuracy Over Temperature (typ)
Temperature-Proportional Voltage Output
User Programmable Temperature Trip Points
User Programmable Hysteresis
20 mA Open Collector Trip Point Outputs
TTL/CMOS Compatible
Single-Supply Operation (4.5 V to 13.2 V)
Low Cost 8-Pin DIP and SO Packages
APPLICATIONS
Over/Under Temperature Sensor and Alarm
Board Level Temperature Sensing
Temperature Controllers
Electronic Thermostats
Thermal Protection
HVAC Systems
Industrial Process Control
Remote Sensors
GENERAL DESCRIPTION
The TMP01 is a temperature sensor which generates a voltage
output proportional to absolute temperature and a control signal
from one of two outputs when the device is either above or
below a specific temperature range. Both the high/low tempera-
ture trip points and hysteresis (overshoot) band are determined
by user-selected external resistors. For high volume production,
these resistors are available on-board.
The TMP01 consists of a bandgap voltage reference combined
with a pair of matched comparators. The reference provides
both a constant 2.5 V output and a voltage proportional to abso-
lute temperature (VPTAT) which has a precise temperature co-
efficient of 5 mV/K and is 1.49 V (nominal) at +25°C. The
comparators compare VPTAT with the externally set tempera-
ture trip points and generate an open-collector output signal
when one of their respective thresholds has been exceeded.
*. Patent No. 5,195,827.
Hysteresis is also programmed by the external resistor chain and
is determined by the total current drawn out of the 2.5 V refer-
ence. This current is mirrored and used to generate a hysteresis
offset voltage of the appropriate polarity after a comparator has
been tripped. The comparators are connected in parallel, which
guarantees that there is no hysteresis overlap and eliminates
erratic transitions between adjacent trip zones.
The TMP01 utilizes proprietary thin-film resistors in conjunc-
tion with production laser trimming to maintain a temperature
accuracy of ±1°C (typ) over the rated temperature range, with
excellent linearity. The open-collector outputs are capable of
sinking 20 mA, enabling the TMP01 to drive control relays di-
rectly. Operating from a +5 V supply, quiescent current is only
500 μA (max).
The TMP01 is available in the low cost 8-pin epoxy mini-DIP
and SO (small outline) packages, and in die form.
TMP01EP/FP, TMP01ES/FS–SPECIFICATIONS
Plastic DIP and Surface Mount Packages
(V+ = +5 V, GND = O V, –408C ≤ TA ≤ +858C unless otherwise noted)
NOTESK = °C + 273.15.Guaranteed but not tested.Does not consider errors caused by heating due to dissipation of output load currents.Maximum deviation between +25°C readings after temperature cycling between –55°C and +125°C.
5Typical values indicate performance measured at TA = +25°C.Observed in a group sample over an accelerated life test of 500 hours at 150°C.
Specifications subject to change without notice.
Test Load
TMP01
TMP01FJ–SPECIFICATIONS
TO-99 Metal Can Package (V+ = +5 V, GND = O V, –408C ≤ TA ≤ +858C
unless otherwise noted)
NOTESK = °C + 273.15.Guaranteed but not tested.
3Does not consider errors caused by heating due to dissipation of output load currents.Maximum deviation between +25°C readings after temperature cycling between –55°C and +125°C.Typical values indicate performance measured at TA = +25°C.Observed in a group sample over an accelerated life test of 500 hours at 150°C.
Specifications subject to change without notice.
TMP01
WAFER TEST LIMITS
OUTPUT VPTAT
OUTPUT VREF
NOTES
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)
For additional DICE ordering information, refer to databook.
(VDD = +5.0 V, GND = 0 V, TA = +258C, unless otherwise noted)
ABSOLUTE MAXIMUM RATINGS
Maximum Supply Voltage . . . . . . . . . . . . . . . .–0.3 V to +15 V
Maximum Input Voltage
(SETHIGH, SETLOW) . . . . . . . . .–0.3 V to [(V+) +0.3 V]
Maximum Output Current (VREF, VPTAT) . . . . . . . . .2 mA
Maximum Output Current (Open Collector Outputs) . . 50 mA
Maximum Output Voltage (Open Collector Outputs) . . . .15 V
Operating Temperature Range . . . . . . . . . . . .–55°C to +150°C
Dice Junction Temperature . . . . . . . . . . . . . . . . . . . . .+150°C
Storage Temperature Range . . . . . . . . . . . .– 65°C to +150°C
Lead Temperature (Soldering, 60 sec) . . . . . . . . . . . . .+300°C
NOTES
1θJA is specified for device in socket (worst case conditions).
2θJA is specified for device mounted on PCB.
CAUTION
1. Stresses above those listed under “Absolute Maximum Rat-
ings” 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
reliability.
2. 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 packag-
ing at all times until ready to use. Use proper antistatic han-
dling procedures.
3. Remove power before inserting or removing units from their
sockets.
ORDERING GUIDE
TMP01EP
TMP01FP
TMP01ES
TMP01FS
TMP01FJ
NOTESXIND = –40°C to +85°C.Consult factory for availability of MIL/883 version in TO-99 can.
GENERAL DESCRIPTION
The TMP01 is a very linear voltage-output temperature sensor,
with a window comparator that can be programmed by the user
to activate one of two open-collector outputs when a predeter-
mined temperature setpoint voltage has been exceeded. A low
drift voltage reference is available for setpoint programming.
The temperature sensor is basically a very accurately tempera-
ture compensated, bandgap-type voltage reference with a buff-
ered output voltage proportional to absolute temperature
(VPTAT), accurately trimmed to a scale factor of 5 mV/K. See
the Applications Information following.
The low drift 2.5 V reference output VREF is easily divided ex-
ternally with fixed resistors or potentiometers to accurately es-
tablish the programmed heat/cool setpoints, independent of
temperature. Alternatively, the setpoint voltages can be supplied
by other ground referenced voltage sources such as user-
programmed DACs or controllers. The high and low setpoint
voltages are compared to the temperature sensor voltage, thus
creating a two-temperature thermostat function. In addition,
the total output current of the reference (IVREF) determines the
magnitude of the temperature hysteresis band. The open collec-
tor outputs of the comparators can be used to control a wide va-
riety of devices.
Figure 1.Detailed Block Diagram
TMP01
Temperature Hysteresis
The temperature hysteresis is the number of degrees beyond the
original setpoint temperature that must be sensed by the TMP01
before the setpoint comparator will be reset and the output dis-
abled. Figure 2 shows the hysteresis profile. The hysteresis is
programmed by the user by setting a specific load on the refer-
ence voltage output VREF. This output current IVREF is also
called the hysteresis current, which is mirrored internally and
fed to a buffer with an analog switch.
Figure 2.TMP01 Hysteresis Profile
After a temperature setpoint has been exceeded and a compara-
tor tripped, the buffer output is enabled. The output is a cur-
rent of the appropriate polarity which generates a hysteresis
offset voltage across an internal 1000 Ω resistor at the compara-
tor input. The comparator output remains “on” until the volt-
age at the comparator input, now equal to the temperature
sensor voltage VPTAT summed with the hysteresis offset, has
returned to the programmed setpoint voltage. The comparator
then returns LOW, deactivating the open-collector output and
disabling the hysteresis current buffer output. The scale factor
for the programmed hysteresis current is:
IHYS = IVREF = 5 μA/°C + 7 μA
Thus since VREF = 2.5 V, with a reference load resistance of
357 kΩ or greater (output current 7 μA or less), the temperature
setpoint hysteresis will be zero degrees. See the temperature
programming discussion below. Larger values of load resistance
will only decrease the output current below 7 μA and will have
no effect on the operation of the device. The amount of hyster-
esis is determined by selecting a value of load resistance for
VREF, as shown below.
Programming the TMP01
In the basic fixed-setpoint application utilizing a simple resistor
ladder voltage divider, the desired temperature setpoints are
programmed in the following sequence:Select the desired hysteresis temperature.Calculate the hysteresis current IVREF. Select the desired setpoint temperatures.Calculate the individual resistor divider ladder values needed
to develop the desired comparator setpoint voltages at
SETHIGH and SETLOW.
The hysteresis current is readily calculated, as shown. For
example, for 2 degrees of hysteresis, IVREF = 17 μA. Next, the
setpoint voltages VSETHIGH and VSETLOW are determined using
the VPTAT scale factor of 5 mV/K = 5 mV/(°C + 273.15),
which is 1.49 V for +25°C. We then calculate the divider resis-
tors, based on those setpoints. The equations used to calculate
the resistors are:
VSETHIGH = (TSETHIGH + 273.15)(5 mV/°C)
VSETLOW = (TSETLOW + 273.15) (5 mV/°C)
R1 (kΩ) = (VVREF – VSETHIGH)/IVREF =
= (2.5 V – VSETHIGH)/IVREF
R2 (kΩ) = (VSETHIGH – VSETLOW)/IVREF
R3 (kΩ) = VSETLOW/IVREF
Figure 3.TMP01 Setpoint Programming
The total R1 + R2 + R3 is equal to the load resistance needed
to draw the desired hysteresis current from the reference, or
IVREF.
The formulas shown above are also helpful in understanding the
calculation of temperature setpoint voltages in circuits other
than the standard two-temperature thermostat. If a setpoint
function is not needed, the appropriate comparator should be
disabled. SETHIGH can be disabled by tying it to V+, SET-
LOW by tying it to GND. Either output can be left unconnected.
Figure 4.Temperature—VPTAT Scale
Understanding Error Sources
The accuracy of the VPTAT sensor output is well characterized
and specified, however preserving this accuracy in a heating or
cooling control system requires some attention to minimizing
the various potential error sources. The internal sources of
setpoint programming error include the initial tolerances and
temperature drifts of the reference voltage VREF, the setpoint
comparator input offset voltage and bias current, and the hys-
teresis current scale factor. When evaluating setpoint program-
ming errors, remember that any VREF error contribution at the
comparator inputs is reduced by the resistor divider ratios. The
comparator input bias current (inputs SETHIGH, SETLOW)
drops to less than 1 nA (typ) when the comparator is tripped.
This can account for some setpoint voltage error, equal to the
change in bias current times the effective setpoint divider ladder
resistance to ground.
The thermal mass of the TMP01 package and the degree of
thermal coupling to the surrounding circuitry are the largest
factors in determining the rate of thermal settling, which ulti-
mately determines the rate at which the desired temperature
measurement accuracy may be reached. Thus, one must allow
sufficient time for the device to reach the final temperature.
The typical thermal time constant for the plastic package is
approximately 140 seconds in still air! Therefore, to reach the
final temperature accuracy within 1%, for a temperature change
of 60 degrees, a settling time of 5 time constants, or 12 min-
utes, is necessary.
The setpoint comparator input offset voltage and zero hyster-
esis current affect setpoint error. While the 7 μA zero hysteresis
current allows the user to program the TMP01 with moderate
resistor divider values, it does vary somewhat from device to de-
vice, causing slight variations in the actual hysteresis obtained
in practice. Comparator input offset directly impacts the pro-
grammed setpoint voltage and thus the resulting hysteresis
band, and must be included in error calculations.
External error sources to consider are the accuracy of the pro-
gramming resistors, grounding error voltages, and the overall
problem of thermal gradients. The accuracy of the external
programming resistors directly impacts the resulting setpoint
accuracy. Thus in fixed-temperature applications the user
should select resistor tolerances appropriate to the desired
programming accuracy. Resistor temperature drift must be
taken into account also. This effect can be minimized by select-
ing good quality components, and by keeping all components in
close thermal proximity. Applications requiring high measure-
ment accuracy require great attention to detail regarding
thermal gradients. Careful circuit board layout, component
placement, and protection from stray air currents are necessary
to minimize common thermal error sources.
Also, the user should take care to keep the bottom of the
setpoint programming divider ladder as close to GND (Pin 4)
as possible to minimize errors due to IR voltage drops and cou-
pling of external noise sources. In any case, a 0.1 μF capacitor
for power supply bypassing is always recommended at the chip.
Safety Considerations In Heating And Cooling System Design
Designers should anticipate potential system fault conditions
which may result in significant safety hazards which are outside
the control of and cannot be corrected by the TMP01-based
circuit. Governmental and industrial regulations regarding
safety requirements and standards for such designs should be
observed where applicable.
Figure 6.Minimum Supply Voltage vs. TemperatureFigure 5.Supply Current vs. Supply Voltage
TMP01
Figure 7.VPTAT Accuracy vs. Temperature
Figure 8.VREF Accuracy vs. Temperature
Figure 9.Open-Collector Output (OVER, UNDER) Satura-
tion Voltage vs. Output Current
Figure 10. VREF Long Term Drift Accelerated by Burn-In
Figure 11. VREF Power Supply Rejection vs. Frequency
Figure 12. Set High, Set Low Input Offset Voltage vs.
Temperature

Partno	Mfg	Dc	Qty	Available	Descript
TMP01ES	ANALOG	N/a	32	avai	Low Power, Programmable Temperature Controller
tmp01fp		N/a	13	avai	Low Power, Programmable Temperature Controller
TMP01FS	PMI	N/a	1850	avai	Low Power, Programmable Temperature Controller