General Description

The EMC1203 and EMC1204 are temperature sensors that communicate with a host over a single-wire SMSC BudgetBus? Sensor Interface. The EMC1203 has an internal temperature sensor and monitors up to two remote diodes. An additional remote diode is added with the EMC1204 for a total of three remote zones, and both devices are in a small MSOP-8 package. When used in combination with an SMSC Super I/O host, such as a keyboard controller, a complete thermal management system is created. A power down mode preserves battery life in portable applications. The internal 11-bit sigma delta temperature-to-digital converter provides superb linearity, high accuracy and excellent noise immunity.

Features

■ Single-wire SMSC BudgetBus? Sensor Interface

■ Low Power, 3.0V to 3.6V Supply

— < 50uA at 1 conversion per second

— < 2.5uA in Standby

■ External Temperature Sensor

— Range -63.875o C to +191.875o C

— 0.125o C resolution

— ±1o C Accuracy 60o C to 100o C

— Diode Fault Reporting

■ Self Contained Internal Temperature Sensor

— Range 0o C to +85o C

— 0.125o C resolution

— ±3o C Accuracy 0o C to 85o C

■ MSOP-8 3x3mm lead-free RoHS compliant packages

Applications

■ Desktop Computers

■ Notebook Computers

■ Server Applications