Multiple Channel 1°C Temperature Sensors with Beta Compensation
Datasheet
Chapter 6 Product Description
The EMC1413 / EMC1414 is an SMBus temperature sensor. The EMC1413 and EMC1414 monitor
one internal diode and up to two (EMC1413) or three (EMC1414) 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 EMC1413 / EMC1414
and using that data to control the speed of one or more fans.
The EMC1413 and EMC1414 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 EMC1413 and EMC1414 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.
For the EMC1414, External Diode channels 2 and 3 are only compatible with general purpose diodes
(such as a 2N3904). For the EMC1413, the External Diode 2 channel is compatible with any diode
type.
Figure 6.1 shows a system level block diagram of the EMC1414 and Figure 6.2 shows a system level
block diagram of the EMC1413.
VDD = 3.3V
CPU / GPU
3.3V – 5V
DP1
DN1
VDD
Host
Thermal
Junction
SMCLK
SMDATA
EMC1414
SMBus
Interface
ALERT
DP2 / DN3
Optional
Anti-parallel
diode
THERM / ADDR
Power Control
DN2 / DP3
GND
Figure 6.1 System Diagram for EMC1414
Revision 1.41 (02-23-12)
SMSC EMC1413 / EMC1414
DATA1S8HEET
SMSC [ SMSC CORPORATION ]
