SCH3112I-NE SMSC [SMSC Corporation], SCH3112I-NE Datasheet - Page 266

• 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)
24.2.22
24.2.23
Register
Address
Register
Address
6Dh
6Eh
70h
71h
72h
ABSOLUTE LIMIT
Read/
/Write
Write
Read
R/W
R/W
Registers 6D-6Eh: Zone Hysteresis Registers
These registers become read only when the Lock bit is set. Any further attempts to write to these
registers shall have no effect.
If the temperature is above the Zone x Low Temp Limit, then drops below Zone x Low Temp Limit, the
following will occur:
The fan will remain on, at Fan PWM Minimum, until the temperature goes a certain amount below the
associated zones low temperature limit (see Zone x Low Temp Limit registers). That is, when the
temperature is less than the temperature limit minus the hysteresis value, the fan will turn off.
The Hysteresis registers control this amount. See below table for details.
Register 70-72h: SMSC Test Register
This is a read-only smsc test register. Writing to this register has no effect.
R
R
R
127 ° c
50 ° c
.
.
.
Table 24.15 Absolute Limit vs. Register Setting (continued)
SETTING
Zone 1, Zone 2 Hysteresis
SMSC Test Register
SMSC Test Register
SMSC Test Register
Fh
Zone 3, Hysteresis
0h
5h
.
.
.
.
.
Register Name
Register Name
Table 24.16 Hysteresis Settings
ABS LIMIT (DEC)
DATASHEET
LPC IO with 8042 KBC, Reset Generation, HWM and Multiple Serial Ports
(MSb)
(MSb)
Bit 7
H1-3
H3-3
Bit 7
7
7
7
127
250
50
.
.
.
Bit 6
H1-2
H3-2
Bit 6
6
6
6
Bit 5
H1-1
H3-1
Bit 5
5
5
5
Bit 4
H1-0
H3-0
Bit 4
4
4
4
HYSTERESIS
Bit 3
Bit 3
RES
H2-
3
3
3
3
15 ° C
0 ° C
5 ° C
.
.
.
.
.
.
Bit 2
H2-2
Bit 2
RES
ABS LIMIT (HEX)
2
2
2
Bit 1
H2-1
Bit 1
RES
32h
7Fh
1
1
1
.
.
.
(LSb)
(LSb)
SMSC SCH311X
Bit 0
H2-0
Bit 0
RES
0
0
0
Datasheet
Default
Default
Value
Value
44h
40h
N/A
N/A
N/A