EMC1002 datasheet(12/22 Pages) SMSC

12 / 22 page

1°C Dual SMBus Sensor with Resistance Error Correction

Datasheet

Revision 1.3 (03-24-06)

SMSC EMC1002

DATASHEET

The ALERT/THERM2 pin de-asserts when the EMC1002 responds to an alert response address

(ARA=0001 100) sent by the host if the out of limit condition no longer exists, but it does not reset if

the error condition remains. The ALERT/THERM2 pin can be masked so that it will not assert in the

event of an out of limit temperature measurement, except when it is configured as a second THERM

pin.

Figure 4.3 ALERT/THERM2 Response to Temperature Limits Exceeded

The ALERT/THERM2 pin can be configured as a second THERM pin that asserts when the temperature

measurement exceeds the Temperature High Limit value. In this mode, the output will not de-assert

until the temperature drops below the Temperature High Limit minus the THERM Hysteresis value.

4.6

ADDR/THERM Output

The ADDR/THERM output asserts if the temperature measurement exceeds the programmable THERM

limit. It can be used to drive a fan or other fail-safe devices. The ADDR/THERM pin is open drain and

requires a pull-up resistor to VDD. For the EMC1002-2, the value of this pull-up resistor determines the

slave address per Table 1.2 on page 3. The ADDR/THERM pin cannot be masked. Do not exceed 100pf

capacitance total on this pin.

When the ADDR/THERM pin is asserted, it will not de-assert until the temperature drops below the

THERM limit minus the THERM hysteresis value.

Figure 4.4 ADDR/THERM Output Response to Temperature Limit Exceeded

Temp

Time

Temperature High Limit

Temperature Low Limit

ALERT/THERM2

Logic High

Logic

Level

SMBus ARA

Temp

Time

THERM Limit

THERM Limit - THERM Hysterisis

THERM

Hysteresis

Logic High

Logic

Level

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