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EMC2300 Datasheet(PDF) 65 Page - SMSC Corporation

Part No. EMC2300
Description  Fan Control Device with High Frequency PWM and Temperature Monitors
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Maker  SMSC [SMSC Corporation]
Homepage  http://www.smsc.com
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EMC2300 Datasheet(HTML) 65 Page - SMSC Corporation

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Fan Control Device with High Frequency PWM and Temperature Monitors
Datasheet
SMSC EMC2300
65
Revision 0.2 (06-14-06)
DATASHEET
8.2.17
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 the Minimum PWM is set to 00h. 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
APPLICATION NOTE: All three Zone Low Temperature Limit registers must be programmed to a valid value (other
than 80h) to allow the AutoFan control to operate.
8.2.18
Registers 6A-6Ch: Absolute Temperature Limit
Table 8.32 Registers 67-69h: Zone Low Temperature Limit
Register
Address
Read/
Write
Register Name
Bit 7
(MSb)
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
(LSb)
Default
Value
67h
R/W
Zone 1 Low Temp Limit
7
6
5
4
3
2
1
0
80h
68h
R/W
Zone 2 Low Temp Limit
7
6
5
4
3
2
1
0
80h
69h
R/W
Zone 3 Low Temp Limit
7
6
5
4
3
2
1
0
80h
Table 8.33 Temperature Limit vs. Register Setting
LIMIT
LIMIT (DEC)
LIMIT (HEX)
-127
°c
-127
81h
.
.
.
.
.
.
.
.
.
-50
°c-50
CEh
.
.
.
.
.
.
.
.
.
0
°c0
00h
.
.
.
.
.
.
.
.
.
50
°c50
32h
.
.
.
.
.
.
.
.
.
127
°c
127
7Fh
Table 8.34 Registers 6A-6Ch: Absolute Temperature Limit
Register
Address
Read/
Write
Register Name
Bit 7
(MSb)
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
(LSb)
Default
Value
6Ah
R/W
Zone 1 Temp Absolute Limit
7
6
5
4
3
2
1
0
64h
6Bh
R/W
Zone 2 Temp Absolute Limit
7
6
5
4
3
2
1
0
64h
6Ch
R/W
Zone 3 Temp Absolute Limit
7
6
5
4
3
2
1
0
64h


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