EMC1182 datasheet(18/48 Pages) MICROCHIP

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Dual Channel 1°C Temperature Sensor with Beta Compensation and 1.8V SMBus Communications

Datasheet

Revision 1.0 (07-11-13)

SMSC EMC1182

DATASHEET

Chapter 5 Product Description

The is an SMBus temperature sensor. The EMC1182 monitors one internal diode and one externally

connected temperature diode.

Thermal management is performed in cooperation with a host device. This consists of the host reading

the temperature data of both the external and internal temperature diodes of the EMC1182 and using

that data to control the speed of one or more fans.

The EMC1182 has two levels of monitoring. The first provides a maskable ALERT / THERM2 signal

to the host when the measured temperatures exceeds user programmable limits. This allows the

EMC1182 to be used as an independent thermal watchdog to warn the host of temperature hot spots

without direct control by the host. The second level of monitoring provides a non-maskable interrupt

on the THERM pin if the measured temperatures meet or exceed a second programmable limit.

Figure 5.1 shows a system level block diagram of the EMC1182.

5.1

Modes of Operation

The EMC1182 has two modes of operation.



Active (Run) - In this mode of operation, the ADC is converting on all temperature channels at the

programmed conversion rate. The temperature data is updated at the end of every conversion and

the limits are checked. In Active mode, writing to the one-shot register will do nothing.



Standby (Stop) - In this mode of operation, the majority of circuitry is powered down to reduce

supply current. The temperature data is not updated and the limits are not checked. In this mode

of operation, the SMBus is fully active and the part will return requested data. Writing to the one-

shot register will enable the device to update all temperature channels. Once all the channels are

updated, the device will return to the Standby mode.

Figure 5.1 System Diagram for EMC1182

CPU / GPU

EMC1182

Host

SMDATA

Thermal

Junction

SMCLK

SMBus

Interface

THERM / ADDR

ALERT / THERM2

Power

Control

VDD

GND

VDD = 3.3V

1.8V

1.8V – 3.3V

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