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EMC1403

1°C Temperature Sensor with Beta Compensation

Microchip Technology 

1°C Temperature Sensor with Beta Compensation

Data Sheet

Chapter 5 Product Description

The EMC1403 and EMC1404 are SMBus temperature sensors. The EMC1403 monitors one internal

diode and two externally connected temperature diodes. The EMC1404 monitors one internal diode

and three externally connected temperature diodes.

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 EMC1403 and

EMC1404 and using that data to control the speed of one or more fans.

The EMC1403 and EMC1404 have two levels of monitoring. The first provides a maskable ALERT

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

the EMC1403 or EMC1404 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.

Since the EMC1403 and EMC1404 automatically correct for temperature errors due to series

resistance in temperature diode lines, there is greater flexibility in where external diodes are positioned

and better measurement accuracy than previously available with non-resistance error correcting

devices. The automatic beta detection feature means that there is no need to program the device

according to which type of diode is present on the External Diode 1 channel. This also includes CPU

diodes that require the transistor or BJT model for monitoring their temperature. Therefore, the

EMC1403/EMC1404 can power up ready to operate for any system configuration.

For the EMC1404, External Diode channels 2 and 3 are only compatible with general purpose diodes

(such as a 2N3904).

Figure 5.1 shows a system level block diagram of the EMC1403. Figure 5.2 shows a system level block

diagram of the EMC1404.

Figure 5.1 System Diagram for EMC1403

 2014 Microchip Technology Inc.

DS20005272A-page 17

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