mITX-BW – User Guide, Rev. 1.6
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Pin
Signal
Description
Type
3
TACHO
Tacho signal
I
4
-
Not used
Table 23: Signal description
Signal
Description
Type
GND
Power Supply GND signal
PWR
12 V
+12 V supply for fan. A maximum of 2000 mA can be supplied from this pin.
PWR
TACHO
Tacho input signal from the fan, for rotation speed supervision RPM (Rotations
Per Minute). The signal shall be generated by an open collector transistor or
similar.
Onboard is a pull-up resistor 4K7 to +12 V. The signal has to be pulsed and
onboard circuit is prepared for two pulses per rotation.
I
PWM
PWM output signal for FAN speed control.
O
7.3.
PS/2 Keyboard and Mouse Connector (KBDMSE) (J15)
Attachment of a PS/2 keyboard/mouse can be done through the pinrow connector KBDMSE (J15).
Both interfaces utilize open-drain signalling with on-board pull-up.
The PS/2 mouse and keyboard is supplied from SB5 V when in standby mode in order to enable keyboard or mouse
activity to bring the system out from power saving states. The supply is provided through a 1.1 A resettable fuse.
The PS/2 connector does not support wake functions.
Figure 17: Keyboard and Mouse Connector J15
Table 24: Pin Assignment J15
Pin
Signal
Type
Ioh / Iol
Pull U / D
Note
1
KBDCLK
IOD
- / 14 mA
2.7 kΩ
2
KBDDAT
IOD
- / 14 mA
2.7 kΩ
3
MSCLK
IOD
- / 14 mA
2.7 kΩ
4
MSDAT
IOD
- / 14 mA
2.7 kΩ
5
5 V/SB5 V
PWR
-
-
6
GND
PWR
-
-
Table 25: Signal description
Signal
Description
MSCLK
Bi-directional clock signal used to strobe data/commands from/to the PS/2 mouse.
1
2
3
4
5
6
