TMP03/TMP04

REV. 0

–16–

Thermal Response Time

The time required for a temperature sensor to settle to a

specified accuracy is a function of the thermal mass of, and the

thermal conductivity between, the sensor and the object being

sensed. Thermal mass is often considered equivalent to

capacitance. Thermal conductivity is commonly specified using

the symbol

Θ, and can be thought of as thermal resistance. It is

commonly specified in units of degrees per watt of power

transferred across the thermal joint. Thus, the time required for

the TMP03/TMP04 to settle to the desired accuracy is

dependent on the package selected, the thermal contact

established in that particular application, and the equivalent

power of the heat source. In most applications, the settling time

is probably best determined empirically. The TMP03/TMP04

output operates at a nominal frequency of 35 Hz at +25

°C, so

the minimum settling time resolution is 27 ms.

interface schematic). The TMP04 pulse output provides a

significant advantage in this application because it produces a

linear temperature output while needing only one I/O pin and

without requiring an A/D converter.

FAST MICROPROCESSOR, DSP, ETC.,

IN PGA PACKAGE

PGA SOCKET

PC BOARD

TMP04 IN SURFACE

MOUNT PACKAGE

Figure 37. Monitoring the Temperature of a High Power

Microprocessor Improves System Reliability

OUTLINE DIMENSIONS

Dimensions shown in inches and (mm).

3-Pin TO-92

0.105 (2.66)

0.080 (2.42)

0.105 (2.66)

0.080 (2.42)

0.165 (4.19)

0.125 (3.94)

SQUARE

0.019 (0.482)

0.016 (0.407)

0.105 (2.66)

0.095 (2.42)

0.055 (1.39)

0.045 (1.15)

SEATING

PLANE

0.500

(12.70)

MIN

0.205 (5.20)

0.175 (4.96)

0.210 (5.33)

0.170 (4.38)

12

3

BOTTOM VIEW

0.135

(3.43)

MIN

0.050

(1.27)

MAX

8-Pin SOIC (SO-8)

0.1968 (5.00)

0.1890 (4.80)

8

5

4

1

0.2440 (6.20)

0.2284 (5.80)

PIN 1

0.1574 (4.00)

0.1497 (3.80)

0.0688 (1.75)

0.0532 (1.35)

SEATING

PLANE

0.0098 (0.25)

0.0040 (0.10)

0.0192 (0.49)

0.0138 (0.35)

0.0500

(1.27)

BSC

0.0098 (0.25)

0.0075 (0.19)

0.0500 (1.27)

0.0160 (0.41)

8

°

0

°

0.0196 (0.50)

0.0099 (0.25)

x 45

°

8-Pin TSSOP (RU-8)

8

5

4

1

0.122 (3.10)

0.114 (2.90)

PIN 1

0.0256 (0.65)

BSC

SEATING

PLANE

0.006 (0.15)

0.002 (0.05)

0.0118 (0.30)

0.0075 (0.19)

0.0433

(1.10)

MAX

0.0079 (0.20)

0.0035 (0.090)

0.028 (0.70)

0.020 (0.50)

8

°

0

°