Dual RPM-Based PWM Fan Controller with Hardware Thermal Shutdown
Datasheet
Table 6.3 Temperature Data Format
HEX (AS READ BY
REGISTERS)
TEMPERATURE (°C)
BINARY
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
0100_0001_000b
0111_1111_000b
0111_1111_111b
80_00h
C0_20h
C1_00h
FF_00h
FF_E0h
00_00h
00_20h
01_00h
3F_00h
40_00h
41_00h
7F_00h
7F_E0h
-63.875
-63
-1
-0.125
0
0.125
1
63
64
65
127
127.875
6.3
Critical/Thermal Shutdown Temperature Registers
Table 6.4 Critical/Thermal Shutdown Temperature Registers
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
Critical/Thermal
Shutdown
Temperature
7Fh
(+127°C)
0Ah
R
128
64
32
16
8
4
2
1
The Critical/Thermal Shutdown Temperature Register is a read-only register that stores the Voltage
Programmable Threshold temperature used in the Thermal / Critical Shutdown circuitry. The contents
of the register reflect the calculated temperature based on the TRIP_SET voltage. This register is
updated at the end of every monitoring cycle based on the current value of the TRIP_SET voltage.
The data format is shown in Table 6.5.
Table 6.5 Critical / Thermal Shutdown Data Format
TEMPERATURE (°C)
BINARY
HEX
0
1
0000_0000b
0000_0001b
0011_1111b
0100_0000b
00h
01h
3Fh
40h
63
64
SMSC EMC2104
Revision 1.74 (05-08-08)
DATA5S1HEET
SMSC [ SMSC CORPORATION ]
