ADT7481ARMZ datasheet(21/24 Pages) AD

21 / 24 page

ADT7481

Rev. 0 | Page 21 of 24

Figure 21 shows how THERM and THERM2 might operate

together to implement two methods of cooling the system. In

this example, the THERM2 limits are set lower than the

THERM limits. The THERM2 output could be used to turn on

a fan. If the temperature continues to rise and exceeds the

THERM limits, the THERM output could provide additional

cooling by throttling the CPU.

THERM2 LIMIT

THERM LIMIT

THERM2

TEMPERATURE

THERM

°C

Figure 21. Operation of the THERM and THERM2 Interrupts

When the THERM2 limit is exceeded, the THERM2 signal

asserts low.

• If the temperature continues to increase and exceeds the

THERM limit, the THERM output asserts low.

• The THERM output de-asserts (goes high) when the tem-

perature falls to THERM limit minus hysteresis. In Figure 21,

there is no hysteresis value shown.

• As the system cools further, and the temperature falls below

the THERM2 limit, the THERM2 signal resets. Again, no

hysteresis value is shown for THERM2.

The temperature measurement could be either the local or the

remote temperature measurement.

ADT7481ARMZ 데이터시트(PDF) 21 Page - Analog Devices