EMC2103 Standard Microsystems Corporation, EMC2103 Datasheet - Page 44

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

ADDR
ADDR
12h **
10h
11h
Revision 0.85 (01-29-08)
6.5
6.6
R/W
R/W
R/W
R/W
R/W
The Pushed Temperature Registers store user programmed temperature values that can be used by
the look-up table to update the fan control algorithm. Data written in these registers is not compared
against any limits and must match the data format shown in
The TRIP_SET Voltage Register stores data that is measured on the TRIP_SET Voltage input. Each
bit weight represents mV of resolution so that the final voltage can be determined by adding the
weighting of the set bits together.
These registers store the ideality factors that are applied to the external diodes.
The External Diode 3 channel will use the settings for the External Diode 2 channel.
Beta Compensation and Resistance Error Correction automatically correct for most diode ideality
errors, therefore it is not recommended that these settings be updated without consulting SMSC.
Only the lower three bits can be written. Writing to any other bit will be ignored.
The Ideality Factor Registers are software locked.
TRIP_SET Voltage Register
Ideality Factor Registers
REGISTER
REGISTER
TRIP_SET
Ideality **
Register
External
External
Diode 1
Diode 2
Voltage
Ideality
750.0
B7
B7
0
0
Table 6.9 Ideality Factor Look-Up Table
Table 6.7 TRIP_SET Voltage Register
Table 6.8 Ideality Factor Registers
375.0
B6
B6
0
0
SETTING
10h
12h
13h
14h
15h
11h
DATASHEET
187.5
B5
B5
0
0
44
93.75
B4
B4
1
1
FACTOR
1.0053
1.0066
1.0080
1.0093
1.0106
1.0119
RPM-Based Fan Controller with HW Thermal Shutdown
46.88
B3
B3
0
0
Table
23.43
B2
B2
B2
B2
6.3.
11.72
B1
B1
B1
B1
5.89
B0
B0
B0
B0
SMSC EMC2103
Datasheet
DEFAULT
DEFAULT
FFh
12h
12h