EMC6D103-CK SMSC [SMSC Corporation], EMC6D103-CK Datasheet - Page 71

• Manufacturer Part Number: EMC6D103-CK
• Description: FAN CONTROL DEVICE WITH HIGH FREQUENCY PWM
• Manufacturer: SMSC [SMSC Corporation]

Fan Control Device with High Frequency PWM Support and Hardware Monitoring Features
Datasheet
APPLICATION NOTE: All three Zone Low Temperature Limit registers must be programmed to a valid value (other
SMSC EMC6D103
8.2.19
8.2.20
Register
Address
Register
Address
6Ah
6Bh
6Ch
67h
68h
69h
Read/
Read/
Write
Write
R/W
R/W
R/W
R/W
R/W
R/W
Registers 67-69h: Zone Low Temperature Limit
These registers become read only when the Lock bit is set. Any further attempts to write to these
registers shall have no effect.
These are the temperature limits for the individual zones. When the current temperature equals this
limit, the fan will be turned on if it is not already. When the temperature exceeds this limit, the fan
speed will be increased according to the auto fan algorithm based on the setting in the Zone x Range
/ PWMx Frequency register. Default = -127°C=80h
Registers 6A-6Ch: Absolute Temperature Limit
-127°c
LIMIT
127°c
-50°c
50°c
0°c
.
.
.
.
.
.
.
.
.
.
.
.
Table 8.34 Registers 67-69h: Zone Low Temperature Limit
Table 8.36 Registers 6A-6Ch: Absolute Temperature Limit
Zone 1 Temp Absolute Limit
Zone 2 Temp Absolute Limit
Zone 3 Temp Absolute Limit
than 80h) to allow the AutoFan control to operate.
Zone 1 Low Temp Limit
Zone 2 Low Temp Limit
Zone 3 Low Temp Limit
Register Name
Table 8.35 Temperature Limit vs. Register Setting
Register Name
DATASHEET
LIMIT (DEC)
(MSb)
(MSb)
Bit 7
Bit 7
7
7
7
7
7
7
-127
127
-50
50
0
.
.
.
.
.
.
.
.
.
.
.
.
71
Bit 6
Bit 6
6
6
6
6
6
6
Bit 5
Bit 5
5
5
5
5
5
5
Bit 4
Bit 4
4
4
4
4
4
4
Bit 3
Bit 3
3
3
3
3
3
3
Bit 2
Bit 2
2
2
2
2
2
2
LIMIT (HEX)
Bit 1
Bit 1
CEh
7Fh
81h
00h
32h
Revision 0.4 (04-04-05)
1
1
1
1
1
1
.
.
.
.
.
.
.
.
.
.
.
.
(LSb)
(LSb)
Bit 0
Bit 0
0
0
0
0
0
0
Default
Default
Value
Value
80h
80h
80h
64h
64h
64h