Dual RPM-Based PWM Fan Controller with Hardware Thermal Shutdown
Datasheet
Table 6.24 PWM_BASEx[1:0] Bit Decode
PWM_BASEX[1:0]
1
0
BASE FREQUENCY
0
0
1
1
0
1
0
1
26.00kHz
19.531kHz
4,882Hz
2,441Hz (default)
6.19
Limit Registers
Table 6.25 Limit Registers
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
External Diode
1 High Limit
55h
(+85°C)
30h
31h
32h
33h
34h
35h
38h
39h
3Ah
3Bh
3Ch
3Dh
R/W
Sign
Sign
Sign
Sign
Sign
752.9
Sign
Sign
Sign
Sign
Sign
752.9
64
32
16
8
4
2
1
External Diode
2 High Limit
55h
(+85°C)
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
64
64
64
64
32
32
32
32
16
16
8
4
4
4
4
2
2
2
2
1
1
External Diode
3 High Limit
55h
(+85°C)
8
External Diode
4 High Limit
55h
(+85°C)
16
8
1
Internal Diode
High Limit
55h
(+85°C)
16
8
1
VIN4 High
Limit
FFh
(0.8V)
376.5 188.2
94.12
16
47.06
23.53 11.76
5.88
1
External Diode
1 Low Limit
00h
(0°C)
64
64
64
64
64
32
32
32
32
32
8
4
4
4
4
4
2
2
2
2
2
External Diode
2 Low Limit
00h
(0°C)
16
8
1
External Diode
3 Low Limit
00h
(0°C)
16
8
8
1
External Diode
4 Low Limit
00h
(0°C)
16
1
Internal Diode
Low Limit
00h
(0°C)
16
8
1
VIN 4 Low
Limit
00h
(0V)
376.5 188.2
94.12
47.06
23.53 11.76
5.88
The EMC2104 contains high limits for all temperature channels and voltage channels. If any
measurement meets or exceeds the high limit then the appropriate status bit is set and the ALERT#
pin are asserted (if enabled).
SMSC EMC2104
Revision 1.74 (05-08-08)
DATA6S3HEET
SMSC [ SMSC CORPORATION ]
