EMC2104 datasheet(94/101 Pages) SMSC

94 / 101 page

Dual RPM-Based PWM Fan Controller with Hardware Thermal Shutdown

Datasheet

Revision 1.74 (05-08-08)

SMSC EMC2104

DATASHEET

Note: The values shown in Table B.6 are example settings. All the cells in the look-up table are

programmable via SMBus.

680oC

278.125mV

(70°C)

55oC65oC

0Ah

(6144 RPM)

790oC

306.25mV

(75°C)

60oC70oC

09h

(6826 RPM)

8100oC

334.375mV

(80°C)

65oC75oC

08h

(7680 RPM)

Table B.7 Fan Speed Determination for Example #2 (using settings in Table B.6)

EXTERNAL

DIODE 1

TEMPERATURE

(CPU)

THERMISTOR 2

VOLTAGE

READING

PUSHED

TEMPERATURE

INTERNAL DIODE

TEMPERATURE

(AMBIENT)

FAN DRIVE

SETTING RESULT

Example 1:

75°C

140.375mV

48°C

58°C

0Ch (5120RPM) -

CPU requires highest

target

Example 2:

75°C

310mV

58°C

09h (6826 RPM)

Thermistor requires

highest target

Example 3:

75°C

235.125mV

62°C

58°C

09h (6826 RPM)

Pushed Temperature

requires highest

target

Table B.6 Fan Speed Control Table Example #2 (continued)

FAN

SPEED

STEP #

EXTERNAL DIODE

1 TEMPERATURE

(CPU)

THERMISTOR 2

VOLTAGE

READING

PUSHED

TEMPERATURE

SETTING

INTERNAL DIODE

TEMPERATURE

(AMBIENT)

TACH

TARGET

EMC2104 Fiches technique(PDF) 94 Page - SMSC Corporation

EMC2104 Fiches technique(HTML) 94 Page - SMSC Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Fiches technique Télécharger

Lien URL