EMC2300 datasheet(21/81 Pages) SMSC

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Fan Control Device with High Frequency PWM and Temperature Monitors

Datasheet

SMSC EMC2300

Revision 0.2 (06-14-06)

DATASHEET

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)+ (2*1)*68/(45kHz)

Total Conversion Time = (33)*2.133ms+ (2)*1.511ms = ~73ms

Table 6.2 illustrates the min., nom., and max. conversion cycle timing for each of the four averaging

modes.

Note 6.1

The hardware monitor conversion clock is 45KHz

± 10%.

Note 6.2

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

68 clocks, each (1.511ms nom).

Table 6.1 AVG[2:0] Bit Decoder

SFTR[7:5]

MEASUREMENTS PER READING

AVG2

AVG1

AVG0

REMOTE

DIODE 1

REMOTE

DIODE 2

INTERNAL

DIODE

ALL VOLTAGE READINGS

(VCCP, AND VCC)

000

128

161616

323232

Table 6.2 Conversion Cycle Timing

AVG[2:0]

TOTAL

TEMPERATURE

CONVERSIONS

TOTAL

VOLTAGE

CONVERSIONS

CONVERSION CYCLE TIME (MSEC)

MIN.

NOM.

MAX.

000

(2x128)+(1x8)=264

2x8=16

536

587

652

001

(2x16)+(1x1)=33

2x1=2

01X (default)

3x16=48

2x16=32

191

210

233

1XX

3x32=96

2x32=64

382

420

466

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