EMC2103 Standard Microsystems Corporation, EMC2103 Datasheet - Page 48

• Manufacturer Part Number: EMC2103
• Description: Rpm-based Fan Controller with HW Thermal Shutdown
• Manufacturer: Standard Microsystems Corporation

APPLICATION NOTE: When the APD diode is enabled, there will be a delay of a full temperature update before
Revision 0.85 (01-29-08)
6.11
ADDR
21h
R/W
R/W
Bit 1 - SYS1 - Enables the high temperature limit for the External Diode 1 channel to trigger the Critical
/ Thermal Shutdown circuitry (see
Bit 0 - APD (EMC2103-2 only) - This bit enables the Anti-parallel diode functionality on the External
Diode 3 pins (DP3 and DN3).
The Configuration Register is software locked.
The Configuration 2 Register controls conversion rate of the temperature monitoring as well as the
fault queue.
Bit 6 - DIS_DYN - Disables the Dynamic Averaging Feature.
Bit 5 - DIS_TO - Disables the SMBus time out function.
Bit 4 - DIS_AVG - Disables digital averaging of the External Diode channels.
Configuration 2 Register
‘0’ (default) - the External Diode 2 channel high limit will not be linked to the SYS_SHDN pin. If the
temperature meets or exceeds the limit, the ALERT pin will be asserted normally.
‘1’ - the External Diode 2 channel high limit will be linked to the SYS_SHDN pin. If the temperature
meets or exceeds the limit then the SYS_SHDN pin will be asserted. The ALERT pin will be
asserted normally.
‘0’ (default) - The External Diode 1 channel high limit will not be linked to the SYS_SHDN pin. If
the temperature meets or exceeds the limit, the ALERT pin will be asserted normally.
‘1’ - The External Diode 1 channel high limit will be linked to the SYS_SHDN pin. If the temperature
meets or exceeds the limit then the SYS_SHDN pin will be asserted. The ALERT pin will be
asserted normally.
‘0’ (default) - The Anti-parallel diode functionality is disabled. The External Diode 2 channel can be
configured for any type of diode
‘1’ - The Anti-parallel diode functionality is enabled. Both the External Diode 2 and 3 channels are
configured to support a diode or diode connected transistor (such as a 2N3904).
‘0’ (default) - The Dynamic Averaging function is enabled. The conversion time for all temperature
channels is scaled based on the chosen conversion rate to maximize accuracy and immunity to
random temperature measurement variation.
‘1’ - The Dynamic Averaging function is disabled. The conversion time for all temperature channels
is fixed regardless of the chosen conversion rate.
‘0’ (default) - The SMBus time out function is enabled.
‘1’ - The SMBus time out function is disabled allowing the device to be fully I
‘0’ (default) - The External Diode channels have digital averaging enabled. The temperature data
is the average of the previous four measurements.
REGISTER
Config 2
any comparisons and functionality associated with the External Diode 3 channel will be
implemented. This includes the SYS3 bit operation, limit comparisons, and look up table
comparisons.
B7
-
Table 6.15 Configuration 2 Register
DIS_D
YN
B6
Section
DATASHEET
DIS_
B5
TO
48
5.1).
DIS_
AVG
B4
RPM-Based Fan Controller with HW Thermal Shutdown
QUEUE[1:0]
B3
B2
B1
CONV[1:0]
2
C compliant.
B0
SMSC EMC2103
DEFAULT
Datasheet
0Eh