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EMC6D102
(Rev.:2006)

Fan Control Device with Hardware Monitoring and Acoustic Noise Reduction Features

SMSC -> Microchip 

Fan Control Device with Hardware Monitoring and Acoustic Noise Reduction Features

Datasheet

Table 5.1 AVG[2:0] Bit Decoder

SFTR[7:5]

MEASUREMENTS PER READING

AVG2

0

0

0

1

AVG1

0

0

1

X

AVG0

0

1

X

X

REMOTE

DIODE 1

128

16

16

32

REMOTE

DIODE 2

128

16

16

32

INTERNAL

ALL VOLTAGE READINGS

DIODE (+2.5V, +5V, +12V, VCCP, AND VCC)

8

8

1

1

16

16

32

32

Note: The default for the AVG[2:0] bits is ‘010’b.

To calculate conversion cycle timing for a given averaging mode:

„ Compute total number of temperature conversions (TEMP_CONV)

„ Compute total number of voltage conversions (VOLT_CONV)

„ Calculate Time to complete all conversions is:

Total Conversion Time = (TEMP_CONV)*96/(45kHz +/-10%)+ (VOLT_CONV)*68/(45kHz +/-10%)

Example: To calculate the nominal conversion time FOR AVG[2:0] = 001b.

Total Conversion Time = (TEMP_CONV)*96/(45kHz)+ (VOLT_CONV)*68/(45kHz)

Total Conversion Time = (16+16+1)*96/(45kHz)+ (5*1)*68/(45kHz)

Total Conversion Time = (33)*2.133ms+ (5)*1.511ms = ~78ms

Table 5.2 illustrates the min., nom., and max. conversion cycle timing for each of the four averaging

modes.

Table 5.2 Conversion Cycle Timing

AVG[2:0]

000

001

01X (default)

1XX

TOTAL

TEMPERATURE

CONVERSIONS

(2x128)+(1x8)=264

(2x16)+(1x1)=33

3x16=48

3x32=96

TOTAL

VOLTAGE

CONVERSIONS

5x8=40

5x1=5

5x16=80

5x32=160

CONVERSION CYCLE TIME (MSEC)

MIN.

567

71

203

406

NOM.

624

78

223

447

MAX.

693

87

248

496

5.3.1

Notes:

„ The hardware monitor conversion clock is 45KHz ± 10%.

„ Temperature conversions take 96 clocks, each (2.133ms nom.); Voltage conversions take 68

clocks, each (1.511ms nom).

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.

SMSC EMC6D102

19

DATASHEET

Revision 0.4 (06-15-06)

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