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EMC2300 Datasheet(PDF) 21 Page - SMSC Corporation

Part No. EMC2300
Description  Fan Control Device with High Frequency PWM and Temperature Monitors
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Maker  SMSC [SMSC Corporation]
Homepage  http://www.smsc.com
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EMC2300 Datasheet(HTML) 21 Page - SMSC Corporation

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Fan Control Device with High Frequency PWM and Temperature Monitors
Datasheet
SMSC EMC2300
21
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
128
8
8
0
0
1
16
16
1
1
0
1
X
161616
16
1
X
X
323232
32
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
67
73
82
01X (default)
3x16=48
2x16=32
191
210
233
1XX
3x32=96
2x32=64
382
420
466


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