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EMC2106 EVB User Manual
Revision 1.1 (08-22-07) SMSC EMC2106
10
Table 3.2 summarizes the options available to drive various 5V fans..
The remote diode on board the EMC2106 EVB has a heater and an optional inline series resistance
adjustment. Checking the REC feature of the EMC2106 is accomplished by removing the jumper on
JP9. This adds 100 ohms of series resistance to the DN line of the diode connection. To return to 0
ohm series resistance, replace the jumper on JP9.
To heat the diode, place a jumper on JP10 in position 1-2. To return to ambient conditions, place
shorting bar in position 2-3 on JP2. These remote diode options are summarized in
Table 3.3 below.
Table 3.2 Fan Driver Configuration
FAN DRIVER
CONFIGURATION FAN TYPE
FAN
CONNECTOR
REQUIRED
JUMPERS
FAN_OUT 3-wire J3 None -
PWM1 4-wire J1 None, SW programmed
PWM2 4-wire J2 JP7 -Position 2-3
JP18 - Position 2-3
DAC2 2 or 3-wire TP17 user provided offboard
circuitry needed
Table 3.3 Remote Diode and Thermistor Connections and Heater Settings
NAME JUMPER CONDITION 1 CONDITION 2
Ext Diode 1 JP5 onboard diode
JP5 - positions 1-2 and 3-4
JP14 - open
external offboard diode
JP5 - connect DP to pin 1 and DN to pin 3
JP14 - open
Ext Diode 2 JP6 onboard diode
JP6 - positions 1-2 and 3-4
JP16 - open
external offboard diode
JP6 - connect DP to pin 1 and DN to pin 3
JP16 - open
Ext Diode 3/4 JP8 onboard diodes
JP8 - positions 1-2 and 3-4
JP17 - open
external offboard diodes
JP8 - connect DP to pin 1 and DN to pin 3
JP17 - open
REC JP9 100 ohms in
DN line (diode remote -)
JP9 - Open
0 ohms in
DN line (diode remote -)
JP9- Short
HEATER JP10 1W resistive heater on remote
diode Q1
JP10 - Position 1-2
Ambient temp on remote diode Q1
JP10 - Position 2-3
Thermistor 1 JP14 onboard thermistor 1
JP14 - positions 1-2 and 3-4
JP5 - open
Thermistor 2 JP16 onboard thermistor 2
JP16 - positions 1-2 and 3-4
JP6 - open
Thermistor 3 JP17 onboard thermistor 3
JP17 - positions 1-2 and 3-4
JP8 - open