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

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 μA (max).

The TMP01 is available in 8-pin mini PDIP, SOIC, and TO-99

packages.