SCH3112I-NE SMSC [SMSC Corporation], SCH3112I-NE Datasheet - Page 206

• 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)
23.7.1
AVG2
0
0
0
1
SAMPLING ORDER
SFTR[7:5]
For each mode, there are four options for the number of measurements that are averaged for each
temperature reading. These options are selected using bits[7:5] of the Special Function Register (7Ch).
These bits are defined as follows:
Bits [7:5]
The AVG[2:0] bits determine the amount of averaging for each of the measurements that are performed
by the hardware monitor before the reading registers are updated (). The AVG[2:0] bits are priority
encoded where the most significant bit has highest priority. For example, when the AVG2 bit is
asserted, 32 averages will be performed for each measurement before the reading registers are
updated regardless of the state of the AVG[1:0] bits.
Note: The default for the AVG[2:0] bits is ‘010’b.
Continuous Monitoring Mode
In the continuous monitoring mode, the sampling and conversion process is performed continuously
for each temperature reading after the Start bit is set high. The time for each temperature reading is
shown above for each measurement option.
The continuous monitoring function is started by doing a write to the Ready/Lock/Start Register, setting
the START bit (Bit 0) high. The part then performs a “round robin” sampling of the inputs, in the order
shown below (see
Table
When the continuous monitoring function is started, it cycles through each measurement in sequence,
and it continuously loops through the sequence approximately once every 150.8 ms (default - see ).
Each measured value is compared to values stored in the Limit registers. When the measured value
violates the programmed limit the Hardware Monitor Block will set a corresponding status bit in the
Interrupt Status Registers.
If auto fan option is selected, the hardware will adjust the operation of the fans accordingly.
The results of the sampling and conversions can be found in the Reading Registers and are available
at any time.
AVG1
X
0
0
1
23.2).
1
2
3
AVG[2:0]
AVG0
X
X
0
1
Table
Table 23.2 ADC Conversion Sequence
Table 23.1 AVG[2:0] BIT DECODER
REMOTE
DIODE 1
23.2). Sampling of all values occurs in a nominal 150.8 ms (default - see
128
16
16
32
MEASUREMENTS PER READING
Remote Diode Temp Reading 1
Ambient Temperature reading
Remote Diode Temp Reading 2
DATASHEET
LPC IO with 8042 KBC, Reset Generation, HWM and Multiple Serial Ports
190
REMOTE
DIODE 2
128
16
16
32
AMBIENT
REGISTER
16
32
8
1
CONVERSION CYCLE
NOMINAL TOTAL
TIME (MSEC)
587.4
150.8
301.5
73.4
SMSC SCH311X
Datasheet