Dual RPM-Based PWM Fan Controller with Hardware Thermal Shutdown
Datasheet
Table 6.5 Critical / Thermal Shutdown Data Format (continued)
TEMPERATURE (°C) BINARY
HEX
65
0100_0001b
0111_1111b
1000_0010b
1001_0110b
41h
7Fh
82h
96h
127
130
150
6.4
Pushed Temperature Registers
Table 6.6 Pushed Temperature Register
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
Pushed
Temperature 1
0Ch
0Dh
0Eh
0Fh
R/W
Sign
64
32
16
8
4
2
1
00h
Pushed
Temperature 2
R/W
R/W
R/W
Sign
Sign
Sign
64
64
64
32
32
32
16
16
16
8
8
8
4
4
4
2
2
2
1
1
1
00h
00h
00h
Pushed
Temperature 3
Pushed
Temperature 4
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
Voltage Registers
Table 6.7 TripSet Voltage Register
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
TRIP_SET
Voltage / VIN4
Voltage
10h
R
400
200
100
50
25
13.5
6.25
3.125
FFh
The Voltage Registers hold the data read from the TRIP_SET voltage input. The TRIP_SET voltage is
stored whether the TRIP_SET is used to set the Thermal / Critical Shutdown temperature or configured
to act as the VIN4 input.
Each bit weight represents mV of resolution so that the final voltage can be determined by adding the
appropriately set bits together.
Revision 1.74 (05-08-08)
SMSC EMC2104
DATA5S2HEET
SMSC [ SMSC CORPORATION ]
