TMP05ART-500RL7 datasheet(18/28 Pages) AD

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TMP05/TMP06

Rev. 0 | Page 18 of 28

TEMPERATURE MONITORING

The TMP05/TMP06 are ideal for monitoring the thermal

environment within electronic equipment. For example, the

surface-mounted package accurately reflects the exact thermal

conditions that affect nearby integrated circuits.

The TMP05/TMP06 measure and convert the temperature at

the surface of their own semiconductor chip. When the TMP05/

TMP06 are used to measure the temperature of a nearby heat

source, the thermal impedance between the heat source and the

TMP05/TMP06 must be considered. Often, a thermocouple or

other temperature sensor is used to measure the temperature of

the source, while the TMP05/TMP06 temperature is monitored

by measuring TH and TL. Once the thermal impedance is deter-

mined, the temperature of the heat source can be inferred from

the TMP05/TMP06 output.

One example of using the TMP05/TMP06’s unique properties is

in monitoring a high power dissipation microprocessor. The

TMP05/TMP06 part, in a surface-mounted package, is mounted

directly beneath the microprocessor’s pin grid array (PGA)

package. In a typical application, the TMP05/TMP06’s output is

connected to an ASIC, where the pulse width is measured. The

TMP05/TMP06 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 ADC.

DAISY-CHAIN APPLICATION

This section provides an example of how to connect two

TMP05s in daisy-chain mode to a standard 8052 microcon-

troller core. The ADuC812 is the microcontroller used in the

following example and has the 8052 as its core processing

engine. Figure 32 shows how to interface to the 8052 core

device. TMP05 Program Code Example 1 shows how to

communicate from the ADuC812 to the two daisy-chained

TMP05s. This code can also be used with the ADuC831 or any

microprocessor running on an 8052 core.

Figure 32 is a diagram of the input waveform into the ADuC812

from the TMP05 daisy chain, and it shows how the code’s

variables are assigned. It should be referenced when reading

TMP05 Program Code Example 1. Application notes are

available on the Analog Devices Web site showing the TMP05

working with other types of microcontrollers.

TIMER T0

STARTS

TEMPSEGMENT = 1

TEMPSEGMENT = 2 TEMPSEGMENT = 3

TEMP_HIGH2

TEMP_HIGH1

TEMP_LOW0

TEMP_LOW1

TEMP_HIGH0

INTO

Figure 32. Reference Diagram for Software Variables

in TMP05 Program Code Example 1

Figure 33 shows how the three devices are hardwired together.

Figure 34 to Figure 36 are flow charts for this program.

VDD

START

PULSE

TH (U2)

TL (U2)

TL (U1)

TH (U1)

TIME

TH (U1)

TL (U1)

GND

FUNC

CONV/IN

OUT

TMP05 (U1)

GND

FUNC

CONV/IN

OUT

TMP05 (U2)

ADuC812

P3.7

P3.2/INTO

TIME

START

PULSE

START

PULSE

VDD

0.1

µF

VDD

0.1

µF

VDD

Figure 33. Typical Daisy-Chain Application Circuit

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