EMC2102 Standard Microsystems Corporation, EMC2102 Datasheet - Page 27

• Manufacturer Part Number: EMC2102
• Description: Rpm-based Fan Controller with HW Thermal Shutdown
• Manufacturer: Standard Microsystems Corporation

RPM-Based Fan Controller with HW Thermal Shutdown
Datasheet
SMSC EMC2102
ThermTrip# Power_OK ThermTrip_SHDN
0
1
1
0
Power Supply
From CPU /
From the
Chipset
(THERMTRIP#) and power supply (POWER_OK) and configuration information from the fixed states
of the SHDN_SEL pins as described in
In addition, each of the temperature limits can be configured to act as inputs to the Critical / Thermal
Shutdown independent of the hardware shutdown operation.
The analog portion of the Critical/Thermal Shutdown function monitors a specific remote temperature
channel (configured with the SHDN_SEL pin). This measured temperature is then compared with the
TRIP_SET point. This TRIP_SET point is created by the system designer with a simple resistor divider
and is discussed in detail in
0
0
1
1
3.3V
S/W Set Sensor
H/W Set Sensor
S/W Set Sensor
THERMTRIP#
TRIP_SET
POWER_OK
H/W Critical
Figure 5.4 EMC2102 Critical/Thermal Shutdown Block Diagram
Sensor
1
0
0
0
Temperature
Temperature
Conversion
Conversion
Conversion
and Limit
Shutdown
Registers
Thermal
Voltage
Section
DATASHEET
5.7.1.
‘0’ or ‘open’
Critical Shutdown Logic
Section
27
SYS1 - SYS3
PIN Decode
5.7.2.
‘1’
SW_SHDN
Thermal_SHDN
ThermTrip_
SHDN
HW_SHDN
Configuration
Register
Revision 1.95 (10-19-06)
SYS_SHDN#
SHDN_SEL
SMBus Traffic