SCH3112I-NE SMSC [SMSC Corporation], SCH3112I-NE Datasheet - Page 246

• 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
24.2.1
24.2.2
24.2.3
Register
Address
Register
Address
Register
Address
1Dh
1Eh
1Fh
9Ah
10h
20h
21h
22h
23h
24h
99h
Read/Wr
Read/
Read/
Write
Write
R/W
R/W
R/W
R/W
Register 10h: SMSC Test Register
Setting the Lock bit has no effect on this registers
This register must not be written. Writing this register may produce unexpected results.
Register 1Dh, 1Eh, 1Fh: Offset Registers
These registers become read only when the Lock bit is set. Any further attempts to write to these
registers shall have no effect.
Offset Register Ambient only applies to the internal (ambient) temperature reading. This register
contains a 2's complement value, which is added (or subtracted if the number is negative) to the
ambient temperature reading. The default value in the offset register is zero, so initially zero is always
added to the temperature reading.
Offset Register 2 only applies to the Zone 2 temperature reading. This register contains a 2's
complement value, which is added (or subtracted if the number is negative) to external temperature
reading 2. The default value in the offset register is zero, so initially zero is always added to the
temperature reading.
Offset Register 1 only applies to the Zone 1 temperature reading. This register contains a 2's
complement value, which is added (or subtracted if the number is negative) to the external temperature
reading 1 reading. The default value in the offset register is zero, so initially zero is always added to
the temperature reading.
Registers 20-24h, 99-9Ah: Voltage Reading
The Voltage Reading registers reflect the current voltage of the voltage monitoring inputs. Voltages are
presented in the registers at ¾ full scale for the nominal voltage, meaning that at nominal voltage, each
Defined Registers
ite
R
R
R
R
R
R
R
Offset Register Ambient
Register Name
Offset Register 2
Offset Register 1
SMSC TEST
Register Name
Register Name
+12V Reading
Vccp Reading
2.5V Reading
VCC Reading
VTR Reading
Vbat Reading
+5V Reading
(MSb)
TST7
Bit 7
DATASHEET
LPC IO with 8042 KBC, Reset Generation, HWM and Multiple Serial Ports
(MSb)
(MSb)
Bit 7
Bit 7
7
7
7
7
7
7
7
7
7
7
230
TST6
Bit 6
Bit 6
Bit 6
6
6
6
6
6
6
6
6
6
6
TST5
Bit 5
Bit 5
Bit 5
5
5
5
5
5
5
5
5
5
5
TST4
Bit 4
Bit 4
Bit 4
4
4
4
4
4
4
4
4
4
4
TST3
Bit 3
Bit 3
Bit 3
3
3
3
3
3
3
3
3
3
3
TST2
Bit 2
Bit 2
Bit 2
2
2
2
2
2
2
2
2
2
2
TST1
Bit 1
Bit 1
Bit 1
1
1
1
1
1
1
1
1
1
1
(LSb)
(LSb)
SMSC SCH311X
(LSb)
TST0
Bit 0
Bit 0
Bit 0
0
0
0
0
0
0
0
0
0
0
Datasheet
Default
Default
Default
Value
Value
Value
00h
00h
00h
00h
N/A
N/A
N/A
N/A
N/A
N/A
N/A