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EMC1063-2-ACZL-TR

1°C Triple Temperature Sensor with Hotter of Two Zones

SMSC -> Microchip 

1°C Triple Temperature Sensor with Hotter of Two Zones

Datasheet

Chapter 3 Product Description

The EMC1063 is an SMBus sensor that monitors three temperature zones for use in a personal

computer or embedded environment. The part may be used as a companion to one of SMSC’s broad

line of SIO host devices to perform fan control and thermal management.

The EMC1063 is designed to operate with two AMD thermal diodes. The External diode 2 channel can

be configured with the Resistance Error Correction feature enabled to measure a discrete 2N3904

diode. A typical system is shown in Figure 3.1.

CPU

Thermal

diode

Thermal

diode

CPU

EMC1063

DP1

DN1

DP2

DN2

Internal

Diode

Host

SMBus

SMBus

Interface

Figure 3.1 EMC1063 Diode System

3.1

Power Modes

The EMC1063 has two power modes.

„ Run Mode - In this mode, the temperature monitors are active and converting at the programmed

conversion rate. The average power dissipation will depend on the conversion rate. When the

EMC1063 is not actively converting a channel, it goes into a lower power wait state.

„ Standby Mode (power-up default) - in this mode, the EMC1063 is put into a low power state. In the

standby mode, temperature monitoring is disabled. The device will still respond to SMBus

commands.

3.2

One Shot During Standby Mode

The EMC1063 supports a One-Shot command when it is in Standby Mode. Writing to the One-Shot

register will cause the device to power up, perform 1 full set of temperature conversions, then return

to Standby Mode.

3.3

Operation During Run Mode

When the device is active, there are two modes of operation available.

„ Normal Mode (power-up default) - In this mode of operation, the EMC1063 continuously samples

and updates all of its temperature channels.

„ Hotter of Two Mode - In this mode, the EMC1063 continuously samples and then compares the

two remote zones. The hotter of the two remote zones is loaded into the External Diode 2 Data

Registers. In addition, the HOTTER bit in the Status register is set or cleared to indicate which

external diode zone is hotter. If the two remote zones are exactly equal to each other, then the

SMSC EMC1063

11

DATASHEET

Revision 1.44 (04-14-08)

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