Fan Control Device with Hardware Monitoring and Acoustic Noise Reduction Features
Datasheet
Chapter 7 Register Set
Definition for the Lock and Start columns:
Yes = Register is made read-only when the related bit is set; No = Register is not made read-only
when the related bit is set.
Table 7.1 Register Summary
Bit 7
MSb
Bit 0
LSb
Reg
Read/
Write
Default
Value
Reg Name
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Lock
Start
Addr
10h
1Dh
1Eh
1Fh
20h
21h
22h
23h
24h
25h
26h
27h
28h
29h
2Ah
2Bh
2Ch
2Dh
2Eh
2Fh
30h
R/W
R/W
R/W
R/W
R
SMSC Test Register
Offset Register Ambient
Offset Register 2
Offset Register 1
+2.5V Reading
7
6
6
5
5
4
4
3
3
2
2
1
1
1
1
1
1
1
1
1
1
1
1
1
9
1
9
1
9
1
9
1
0
0
0
0
0
0
0
0
0
0
0
0
0
8
0
8
0
8
0
8
0
00h
00h
00h
00h
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
No
Yes
Yes
Yes
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
7
7
6
5
4
3
2
7
6
5
4
3
2
7
6
5
4
3
2
R
Vccp Reading
7
6
5
4
3
2
R
VCC Reading
7
6
5
4
3
2
R
+5V Reading
7
6
5
4
3
2
R
+12V Reading
7
6
5
4
3
2
R
Remote Diode 1 Temp Reading
Internal Temp Reading
Remote Diode 2 Temp Reading
Tach1 LSB
7
6
5
4
3
2
R
7
6
5
4
3
2
R
7
6
5
4
3
2
R
7
6
5
4
3
2
R
Tach1 MSB
15
7
14
6
13
5
12
4
11
3
10
2
R
Tach2 LSB
R
Tach2 MSB
15
7
14
6
13
5
12
4
11
3
10
2
R
Tach3 LSB
R
Tach3 MSB
15
7
14
6
13
5
12
4
11
3
10
2
R
Tach4 LSB
R
Tach4 MSB
15
7
14
6
13
5
12
4
11
3
10
2
R/W
Note 7.1
PWM1 Current Duty Cycle
Yes
Note 7.1
31h
32h
R/W
Note 7.1
PWM2 Current Duty Cycle
PWM3 Current Duty Cycle
7
7
6
6
5
5
4
4
3
3
2
2
1
1
0
0
N/A
N/A
Yes
Note 7.1
No
No
R/W
Note 7.1
Yes
Note 7.1
3Eh
3Fh
40h
R
R
Company ID
7
6
5
4
3
2
1
0
5Ch
65h
00h
No
No
No
No
No
Version / Stepping
Ready/Lock/Start
VER3
RES
VER2
RES
VER1
RES
VER0
RES
STP3
STP2
STP1
STP0
START
R/W
Note 7.2
OVRID READY LOCK
Yes
Note 7.2
41h
42h
R-C
Note 7.3
Interrupt Status Register 1
Interrupt Status Register 2
INT2
D2
AMB
D1
5V
VCC
Vccp
RES
2.5V
12V
00h
00h
No
No
No
R-C
Note 7.3
ERR2
ERR1
TACH4 TACH3 TACH2 TACH1
No
43h
44h
45h
46h
47h
48h
49h
4Ah
4Bh
4Ch
4Dh
4Eh
4Fh
50h
51h
52h
R
VID0-4
2.5V Low Limit
RES
7
RES
6
RES
5
VID4
4
VID3
3
VID2
2
VID1
1
VID0
0
N/A
00h
FFh
00h
FFh
00h
FFh
00h
FFh
00h
FFh
81h
7Fh
81h
7Fh
81h
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
2.5V High Limit
7
6
5
4
3
2
1
0
Vccp Low Limit
7
6
5
4
3
2
1
0
Vccp High Limit
7
6
5
4
3
2
1
0
VCC Low Limit
7
6
5
4
3
2
1
0
VCC High Limit
7
6
5
4
3
2
1
0
5V Low Limit
7
6
5
4
3
2
1
0
5V High Limit
7
6
5
4
3
2
1
0
12V Low Limit
7
6
5
4
3
2
1
0
12V High Limit
7
6
5
4
3
2
1
0
Remote Diode 1 Low Temp
Remote Diode 1 High Temp
Internal Low Temp
Internal High Temp
Remote Diode 2 Low Temp
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
SMSC EMC6D102
Revision 0.4 (04-05-05)
DATA4S5HEET
SMSC [ SMSC CORPORATION ]
