SMSC EMC1152

PRODUCT PREVIEW

Revision 2.55 (12-06-06)

Data Brief

PRODUCT FEATURES

EMC1152

SST Compliant

Hardware Monitor with

Two Temperature

Channels and Five

Voltage Channels

GENERAL DESCRIPTION

The EMC1152 is a one-wire sensor that is capable of

monitoring up to five voltages and two temperature

zones for an Intel PC platform containing an SST host.

The two temperature zones consist of an internal

temperature diode and an externally connected

temperature diode. In cooperation with a host device,

thermal management and fan control can be performed.

Communication takes place over a one-wire SST based

interface. The internal 11-bit delta-sigma ADC

architecture provides superb linearity, high accuracy,

and excellent noise immunity.

APPLICATIONS

Desktop PCs, Servers and Workstations

FEATURES

Single Wire Interface (SST based)

— SST 1.0 compliant

— Fixed Address, Discoverable Device

— Three programmable addresses

— Supports FCS Abort functionality not available in SST

0.9 compliant devices

Resistance Error Correction

Ideality Configuration

Beta Compensation (EMC1152-1)

— EMC1152 configured to measure 2N3904 diode

— EMC1152-1 configured to measure CPU substrate

diode

External Temperature Monitor

— 0.125°C resolution

— ±1°C Accuracy (50°C to 70°C)

— Diode Fault Reporting

Internal Temperature Monitor

— Range -40°C to +125°C

— 0.125°C resolution

— ±2°C Accuracy (40°C to 70°C)

Voltage Monitor:

— 12V, 5V, 3.3V, 2.5V, VCCP inputs

— 2% Total Unadjusted Error

— 11-bit resolution

Supply

— 3.0V to 3.6V

SIMPLIFIED BLOCK DIAGRAM

EMC1152

Internal

Temp

Diode

Switching

Current

Configuration

Register

Status Register

External Temp

Register

Internal Temp

Register

SST

11-bit

delta-sigma

ADC

DP

DN

Digital Mux

and

Byte Interlock

Voltage

Registers

12V

5V

3.3V

2.5V

VCCP

ADD