Low Power Programmable
Temperature Controller
TMP01
Rev. E
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FEATURES
−55°C to +125°C (−67°F to +257°F) operation
±1.0°C 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)
PDIP, SOIC, and TO-99 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
FUNCTIONAL BLOCK DIAGRAM
VPTAT
V+
TEMPERATURE
SENSOR AND
VOLTAGE
REFERENCE
2.5V
SENSOR
1
2
3
4
8
7
6
5
HYSTERESIS
GENERATOR
WINDOW
COMPARATOR
TMP01
VREF
SET
HIGH
SET
LOW
GND
UNDER
OVER
R1
R2
R3
0333-001
Figure 1.
GENERAL DESCRIPTION
The TMP01 is a temperature sensor that 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
temperature 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 band gap voltage reference combined
with a pair of matched comparators. The reference provides
both a constant 2.5 V output and a voltage proportional to
absolute temperature (VPTAT) which has a precise temperature
coefficient 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.
Hysteresis is also programmed by the external resistor chain
and is determined by the total current drawn out of the 2.5 V
reference. 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 (typical) 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
directly. Operating from a 5 V supply, quiescent current is only
500 A (max).
The TMP01 is available in 8-pin mini PDIP, SOIC, and TO-99
packages.
