EMC1074-A-AIZL-TR SMSC, EMC1074-A-AIZL-TR Datasheet - Page 16

• Manufacturer Part Number: EMC1074-A-AIZL-TR
• Description: Board Mount Temperature Sensors SMBus Temp Sensor Selectable Address
• Manufacturer: SMSC

Specifications of EMC1074-A-AIZL-TR

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Chapter 5 Product Description
Revision 1.39 (10-11-10)
Anti-parallel
Diodes
Thermal
diode
The EMC1073 and EMC1074 are SMBus temperature sensors. The EMC1073 monitors one internal
diode and two externally connected temperature diodes. The EMC1074 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 EMC1073 and
EMC1074 and using that data to control the speed of one or more fans.
The EMC1073 and EMC1074 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 EMC1073 or EMC1074 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.
Figure 5.1
diagram of the EMC1074.
CPU
Thermal
diode
CPU
shows a system level block diagram of the EMC1073.
DP1
DN1
DP2
DN2
EMC1073
Internal
Diode
Figure 5.1 System Diagram for EMC1073
Figure 5.2 System Diagram for EMC1074
DP1
DN1
DP2 / DN3
DN2 / DP3
EMC1074
Internal
Diode
DATASHEET
SMDATA
THERM
SMCLK
ALERT
Multiple Channel 1°C Temperature Sensors with Selectable Address
16
SMDATA
SMCLK
THERM
ALERT
Interface
Power Control
SMBus
Interface
Host
SMBus
Power Control
Host
Figure 5.2
shows a system level block
SMSC EMC1073 / EMC1074
Datasheet