Environmental Monitoring and Control Device
2. 16 measurements are averaged for the remote diode temperature reading and a single measurement is tDaakteasnhfeoert
all voltage and the internal temperature reading (i.e., no averaging). This is a power saving option. This is the
default operation.
For option 1, the block performs a total of (2 x 128) + (1 x 8) + (8 x 8) = 328 conversions.
Option 2 reduces the number of conversions to (2 x 16) + (1 x 1) + (8 x 1) = 41.
Each temperature conversion takes 2 ms approx. and each voltage conversion takes 1.5 ms approx.
The total time for option 1 (328 conversions) is (2x128x2) + (1x8x2) + (8x8x1.5) = 624 ms.
The total time for option 2 (41 conversions) is (2x16x2) + (1x1x2) + (8x1x1.5) = 78 ms.
6.3.1 CONTINUOUS MONITORING MODE
In the continuous monitoring mode, the sampling and conversion process is performed continuously for
each voltage and temperature reading after the Start bit is set high. The time for each voltage and
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 (corresponding to locations in the RAM). Sampling of all values occurs in 624 ms (or 78 ms - see
above).
SAMPLING ORDER
REGISTER
Remote Diode Temp Reading 1
Ambient Temperature reading
VCC reading
1
2
3
4
5
+12V reading
+5V reading
6
7
+3.3V reading
+2.5V reading
8
9
10
11
Vccp (processor) reading
Remote Diode Temp Reading 2
+1.8V reading
+1.5V reading
When the continuous monitoring function is started, it cycles through each measurement in sequence, and
it continuously loops through the sequence approximately once every 624 ms (or 78 ms – see above).
Each measured value is compared to values stored in the Limit registers. When the measured value
violates (or is equal to) 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. See section
7.4.2 Auto Fan Control Operating Mode on page 31.
The results of the sampling and conversions can be found in the Reading Registers and are available at
any time.
6.3.2 CYCLE MONITORING MODE
In cycle monitoring mode, the part completes all sampling and conversions, then waits to repeat the
process. It repeats the sampling and conversion process every second (1.4 sec max). The sampling and
SMSC EMC6D100/EMC6D101
Page 22
Rev. 09-09-04
DATASHEET
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