EMC2102 Standard Microsystems Corporation, EMC2102 Datasheet - Page 39

• 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
6.10
32h
ADDRESS
2
0
0
0
0
1
1
1
1
When the Beta Compensation circuitry is disabled, the diode channels will function with default current
levels and will not automatically adjust for beta variation. This mode is used when measuring a discrete
2N3904 transistor or AMD thermal diode.
All of the Beta Configuration Registers are Software Locked.
The REC Configuration Register determines whether Resistance Error Correction is used for each
external diode channel. The REC Configuration Register is software locked.
If either the External Diode 1 channel or External Diode 3 channel is selected by the SHDN_SEL pin
to be the hardware shutdown input channel (see
locked. Writing to the bit will have no affect and reading from it will always report the current setting.
Bit 2 - REC3 - Controls the Resistive Error Correction functionality of External Diode 3
Bit 1 - REC2 - Controls the Resistive Error Correction functionality of External Diode 1
Bit 0 - REC1 - Controls the Resistive Error Correction functionality of External Diode 1
REC Configuration Register
REC
Configuration
‘0’ - the REC functionality for External Diode 3 is disabled
‘1’ (default) - the REC functionality for External Diode 3 is enabled.
‘0’ - the REC functionality for External Diode 2 is disabled
‘1’ (default) - the REC functionality for External Diode 2 is enabled.
‘0’ - the REC functionality for External Diode 1 is disabled
‘1’ (default) - the REC functionality for External Diode 1 is enabled.
REGISTER
BETAX[2:0]
Table 6.13 Beta Compensation Look Up Table
Table 6.14 REC Configuration Register
1
0
0
1
1
0
0
1
1
-
B7
-
B6
DATASHEET
-
B5
39
0
0
1
0
1
0
1
0
1
-
B4
Table
-
B3
5.4), then the corresponding RECx bit will be
0.1111
0.1765
0.25
0.333 (default)
0.4285
1.0
2.333
Disabled
REC3
B2
REC2
MINIMUM BETA
B1
REC1
Revision 1.95 (10-19-06)
B0
07h
DEFAULT