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EMC2103 Datasheet(PDF) 44 Page - SMSC Corporation

Part # EMC2103
Description  RPM-Based Fan Controller with HW Thermal Shutdown
PDF  84 Pages
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Manufacturer  SMSC [SMSC Corporation]
Direct Link  http://www.smsc.com
Logo SMSC - SMSC Corporation

EMC2103 Datasheet(HTML) 44 Page - SMSC Corporation

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RPM-Based Fan Controller with HW Thermal Shutdown
Datasheet
Revision 0.85 (01-29-08)
44
SMSC EMC2103
DATASHEET
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 Table 6.3.
6.5
TRIP_SET Voltage Register
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.
6.6
Ideality Factor Registers
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.
Table 6.7 TRIP_SET Voltage Register
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
10h
R/W
TRIP_SET
Voltage
Register
750.0
375.0
187.5
93.75
46.88
23.43
11.72
5.89
FFh
Table 6.8 Ideality Factor Registers
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
11h
R/W
External
Diode 1
Ideality
00
01
0
B2
B1
B0
12h
12h **
R/W
External
Diode 2
Ideality **
00
01
0
B2
B1
B0
12h
Table 6.9 Ideality Factor Look-Up Table
SETTING
FACTOR
10h
1.0053
11h
1.0066
12h
1.0080
13h
1.0093
14h
1.0106
15h
1.0119



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