SCH3112I-NE SMSC [SMSC Corporation], SCH3112I-NE Datasheet - Page 248

• 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)
24.2.5
Register
Address
2Ah
2Bh
2Ch
2Dh
28h
29h
(SENSOR ERROR)
TEMPERATURE
Read/
Write
■
■
■
Note: To read a 12-bit reading value, software must read in the order of MSB then LSB. If several
Registers 28-2Dh: Fan Tachometer Reading
This register is reset to its default value when PWRGD_PS is asserted.
The Fan Tachometer Reading registers contain the number of 11.111 µ s periods (90KHz) between full
fan revolutions. Fans produce two tachometer pulses per full revolution. These registers are updated
at least once every second.
This value is represented for each fan in a 16 bit, unsigned number.
The Fan Tachometer Reading registers always return an accurate fan tachometer measurement, even
when a fan is disabled or non-functional, including when the start bit=0.
R
R
R
R
R
R
-127 ° c
127 ° c
-50 ° c
50 ° c
0 ° c
Zone 1 is controlled by Remote Diode 1 Temp Reading
Zone 2 is controlled by Internal Temp Reading (Ambient Temperature Sensor)
Zone 3 is controlled by Remote Diode 2 Temp Reading
.
.
.
.
.
.
.
.
.
.
.
.
readings are being read at the same time, software can read all the MSB registers then the
corresponding LSB registers. For example: Read RD1 Reading, RD2 Reading, then A/D
Converter LSbs Reg1, which contains the LSbs for RD1 and RD2.
FANTACH1 MSB
FANTACH2 MSB
FANTACH3 MSB
FANTACH1 LSB
FANTACH2 LSB
FANTACH3 LSB
Register Name
Table 24.3 Temperature vs. Register Reading
READING (DEC)
DATASHEET
LPC IO with 8042 KBC, Reset Generation, HWM and Multiple Serial Ports
(MSb)
Bit 7
15
15
15
7
7
7
-127
127
-50
50
0
232
.
.
.
.
.
.
.
.
.
.
.
.
Bit 6
14
14
14
6
6
6
Bit 5
13
13
13
5
5
5
Bit 4
12
12
12
4
4
4
Bit 3
11
11
11
3
3
3
Bit 2
READING (HEX)
10
10
10
2
2
2
CEh
Bit 1
7Fh
81h
00h
32h
80h
9
1
9
1
1
9
.
.
.
.
.
.
.
.
.
.
.
.
(LSb)
SMSC SCH311X
Bit 0
0
8
0
8
0
8
Datasheet
Default
Value
FFh
FFh
FFh
FFh
FFh
FFh