7/ Internal Connectors; Dc Power - Atx Connector -12 V (J10); Fan Connectors (J34, J29) - Kontron mITX-BDW-U User Manual

7/ Internal Connectors

7.1. DC Power - ATX Connector -12 V (J10)

The mITX-BDW-U can be supplied from either an internal 12 V ATX power supply (J10)or an external 19 V power
adapter(J13). The Internal12 V connector must be used to supply the board with +12 V +/-5 %
ATX+12 V-4p Power Connector Pinout
Note Type
PWR
PWR
1)

7.2. Fan Connectors (J34, J29)

The mITX-BDW-U uses either 4-wire or 3-wire fan connectors. The FANSYS (J29) connector can be used to power,
control and monitor a fan for chassis ventilation etc. The FANCPU (J34) is used for the connection of the fan for the
CPU.
To drive a 4-wire type Fan a 4-pin header is recommended in order to implement FAN speed control. Support for a
3-wire Fan is also possible, but fan speed control is not integrated.
4-Pin and 3-Pin header Pinouts
4-pin Header Pin
1
2
3
4
3-pin Header Pin
1
2
3
4
Signal Description
PWM PWM output signal for FAN speed control.
TACHO Tacho input signal from the fan, for rotation speed supervision RPM (Rotation Per Minute). The
signal shall be generated by an open collector transistor or similar. Onboard is a pull-up resistor
4.7 V to +12 V. The signal has to be pulsed and onboard circuit is prepared for two pulses per
rotation.
12 V +12 V supply for fan. This pin supplies a maximum of 2000 mA.
GND Power Supply GND signal
www.kontron.com
Signal PIN
GND 2
GND 1
Hot Plugging power supply is not supported. Hot Plugging might damage the
board.When connecting to the motherboard, turn off the mains supply etc. to make
sure all the power lines (+12 V or +19 V) are turned off.
Signal
PWM
TACHO
12 V
GND
Signal
TACHO
12 V
GND
Signal
4 +12 V
3 +12 V
Description
PWM output
Tacho signal
Power +12 V
Ground
Description
Not used
Tacho signal
Power +12 V
Ground
mITX-BDW-U – User Guide, Rev. 1.6
Type Note
PWR 1
PWR 1
Type
O-3.3
I
PWR
PWR
Type
I
PWR
PWR
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