EMC6D100 Datasheet, PDF (12/75 Pages) SMSC Corporation – ENVIRONMENTAL MONITORING AND CONTROL DEVICE WITH AUTOMATIC FAN CAPABILITY

Chapter 3
Environmental Monitoring and Control Device
Recommended Implementation
Datasheet
The following figures show the recommended circuitry on the board for the PWM outputs, tachometer
inputs, and remote diodes. FIGURE 3.1 shows how the part can be used to control additional fans by
connecting two fans to one PWM output.
12V
3.3V
3.3V
PWM3
1k
2.2k
MMBT3904
10
10
M
MMBT2222
Fan1
Empty
M
MMBT2222
Fan2
Empty
FIGURE 3.1 - FAN DRIVE CIRCUITRY (APPLY TO PWM DRIVING TWO FANS)
3.3V
PWMx
470
0
12V
MMBT2222
Fan
M
Empty
FIGURE 3.2 - FAN DRIVE CIRCUITRY (APPLY TO PWM DRIVING ONE FAN)
SMSC EMC6D100/EMC6D101
Page 12
DATASHEET
Rev. 09-09-04