1°C Triple Temperature Sensor with Resistance Error Correction & Hotter of Two Zones

Datasheet

SMSC EMC1053

11

Revision 1.37 (02-05-07)

DATASHEET

Chapter 3 Product Description

The EMC1053 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.

A typical system drawing of the EMC1053 is shown in Figure 3.1.

3.1

Power Modes

The EMC1053 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

EMC1053 is not actively converting a channel, it goes into a lower power wait state.

Standby Mode (power-up default) - in this mode, the EMC1053 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 EMC1053 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 EMC1053 continuously samples

and updates all of its temperature channels.

Hotter of Two Mode - In this mode, the EMC1053 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

HOTTER bit is cleared (set to ‘0’), and the results of the two remote zones are stored in their

respective registers.

Figure 3.1 EMC1053 Diode System

EMC1053

Host

SMBus

Interface

SMBus

Internal

Diode

DP1

DN1

DP2

DN2