emc2101 Standard Microsystems Corp., emc2101 Datasheet - Page 31

• Manufacturer Part Number: emc2101
• Description: Emc2101 Fan Control With 1?c Accurate Temperature Monitoring
• Manufacturer: Standard Microsystems Corp.

SMBus Fan Control with 1°C Accurate Temperature Monitoring
Datasheet
SMSC EMC2101
6.1
6.2
56h
57h
58h
59h
5Ah
5Bh
5Ch
5Dh
5Eh
5Fh
BFh
FDh
FEh
FFh
REGISTER
ADDRESS
Note 6.1
When the External Diode High Byte Register is read, the External Diode Low byte is copied into an
internal ‘shadow’ register. The user is free to read the low byte at any time and be guaranteed that it
will correspond to the previously read high byte. Regardless if the low byte is read or not, reading from
an External Diode High Byte Register will automatically refresh this stored low byte data.
When the TACH Reading Low Byte Register is read, the TACH Reading high byte is copied into an
internal ‘shadow’ register. The user is free to read the high byte at any time and be guaranteed that it
will correspond to the previously read low byte. Regardless if the high byte is read or not, reading from
the TACH Reading Low Byte Register will automatically refresh this stored high byte data.
The registers are described in detail below. A bit entry of a ‘-’ indicates that the bit is not used and will
always read 0.
Data Read Interlock
Register Descriptions
R/W (See
Note
R/W (See
Note
R/W (See
Note
R/W (See
Note
R/W (See
Note
R/W (See
Note
R/W (See
Note
R/W (See
Note
R/W (See
Note
R/W (See
Note
R/W
R
R
R
R/W
6.1)
6.1)
6.1)
6.1)
6.1)
6.1)
6.1)
6.1)
6.1)
6.1)
The Look Up Table Registers are made Read Only if the PWM Program bit (bit 5) in PWM
Configuration Register (4Ah) is set.
Table 6.1 Register Set in Hexadecimal Order (continued)
Lookup Table Temp Setting 4
Lookup Table Fan Setting 4
Lookup Table Temp Setting 5
Lookup Table Fan Setting 5
Lookup Table Temp Setting 6
Lookup Table Fan Setting 6
Lookup Table Temp Setting 7
Lookup Table Fan Setting 7
Lookup Table Temp Setting 8
Lookup Table Fan Setting 8
Averaging Filter
Product ID
Manufacturer ID
Revision Register
REGISTER NAME
DATASHEET
31
Look Up Table
Temperature Setting 4
Temp Setting 4
Look Up Table
Temperature Setting 5
Temp Setting 5
Look Up Table
Temperature Setting 6
Temp Setting 6
Look Up Table
Temperature Setting 7
Temp Setting 7
Look Up Table
Temperature Setting 8
Temp Setting 8
Selects averaging function
for external diode
ID
SMSC
Associated Fan Setting for
Associated Fan Setting for
Associated Fan Setting for
Associated Fan Setting for
Associated Fan Setting for
REV
FUNCTION
7Fh
3Fh
7Fh
3Fh
7Fh
3Fh
7Fh
3Fh
7Fh
3Fh
00h
16h or 28h
5Dh
01h
DEFAULT
VALUE
Revision 2.53 (02-19-08)
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