SCH3112I-NE SMSC [SMSC Corporation], SCH3112I-NE Datasheet - Page 264

• Manufacturer Part Number: SCH3112I-NE
• Description: LPC IO with 8042 KBC, Reset Generation, HWM and Multiple Serial Ports
• Manufacturer: SMSC [SMSC Corporation]

Rev 0.2 (09-28-04)
24.2.20
Register
Address
67h
68h
69h
MINIMUM PWM DUTY
Read/
Write
R/W
R/W
R/W
Registers 67-69h: Zone Low Temperature Limit
Note 24.17 This register is reset to the default value following a VCC POR when the PWRGD_PS
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 = 90 ° C=5Ah
-127 ° c
100%
LIMIT
-50 ° c
25%
50%
0%
0 ° c
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
Zone 2 (Ambient) Low Temp Limit
Zone 1 (Remote Diode 1) Low
Zone 3 (Remote Diode 2) Low
signal is asserted.
Table 24.14 Temperature Limit vs. Register Setting
Register Name
Temp Limit
Temp Limit
Table 24.13 PWM Duty vs. Register Setting
VALUE (DECIMAL)
DATASHEET
LPC IO with 8042 KBC, Reset Generation, HWM and Multiple Serial Ports
(MSb)
LIMIT (DEC)
Bit 7
7
7
7
-127
128
255
-50
248
64
0
0
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
Bit 6
6
6
6
Bit 5
5
5
5
Bit 4
4
4
4
Bit 3
3
3
3
Bit 2
2
2
2
VALUE (HEX)
LIMIT (HEX)
Bit 1
CEh
00h
40h
80h
FFh
81h
00h
1
1
1
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
(LSb)
SMSC SCH311X
Bit 0
0
0
0
Datasheet
Default
Note 24
Note 24
Note 24
Value
23h
23h
23h
.17
.17
.17