RPM-Based Fan Controller with HW Thermal Shutdown
Datasheet
6.2
Temperature Data Registers
Table 6.2 Temperature Data Registers
ADDR
R/W
REGISTER
B7
B6
64
B5
32
B4
16
B3
B2
B1
B0
DEFAULT
Internal Diode
High Byte
Sign
8
4
2
1
00h
00h
01h
R
Internal Diode
Low Byte
0.5
0.25
64
0.125
32
-
-
-
-
-
00h
00h
R
R
External
Diode 1 High
Byte
Sign
16
8
4
2
1
02h
External
Diode 1 Low
Byte
0.5
0.25
64
0.125
32
-
-
-
-
-
00h
00h
00h
00h
00h
03h
R
R
R
R
R
External
Diode 2 High
Byte **
Sign
0.5
16
-
8
-
4
-
2
-
1
-
04h **
05h **
06h **
07h **
External
Diode 2 Low
Byte **
0.25
64
0.125
32
External
Diode 3 High
Byte **
Sign
0.5
16
-
8
-
4
-
2
-
1
-
External
Diode 3 Low
Byte **
0.25
0.125
The temperature measurement range is from -64°C to +127.875°C. The data format is a signed two’s
complement number as shown in Table 6.3.
Table 6.3 Temperature Data Format
HEX (AS READ BY
TEMPERATURE (°C)
BINARY
REGISTERS)
Diode Fault
1000_0000_000b
1100_0000_001b
1100_0001_000b
1111_1111_000b
1111_1111_111b
0000_0000_000b
0000_0000_001b
0000_0001_000b
0011_1111_000b
0100_0000_000b
80_00h
C0_20h
C1_00h
FF_00h
FF_E0h
00_00h
00_20h
01_00h
3F_00h
40_00h
-63.875
-63
-1
-0.125
0
0.125
1
63
64
Revision 0.85 (01-29-08)
SMSC EMC2103
DATA4S2HEET
SMSC [ SMSC CORPORATION ]
