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8.13. SPI Connector for External Fast GPIO Expander (J36)
The mITX-SKL-H supports a 6-pin external SPI for external fast General Purpose Input/Output (GPIO) support. The
configurable input output pins are implemented to support the mITX –SKL-H with clock, chip select and two
configurable signal options (Master to Slave or Slave to Master).
Table 26: Pin Assignment SPI connector for Fast GPIO Expander (J36)
Pin
Signal
1
SB3V3
2
SPI MOSI
3
SPI MISO
4
SPI CLK
5
SPI CS#
6
GND
Signal Description
Signal
Description
SB3V3
3.3 V Standby voltage power line. Normal output power, but when the motherboard is turned
off, the on-board SPI Flash connector can supply a 3.3 V power source via this pin
SPI MOSI
SPI signal (Master Out Slave In)
SPI MISO
SPI signal (Master In Slave Out)
SPI CLK
SPI signal (Clock)
SPI CS#
SPI signal (Chip Select)
GND
Power Supply ground signal
8.14. Switches and Jumpers
8.14.1. Always On Jumper Setting (J39)
The "Always On" jumper (J39) can be used to automatically power up the board.
The jumper has three pins. Pin 1-2 is the "Always On" position and not mounted is the default position. More
information on setting the "Always On" Jumper (J39) can be found in the following table.
Figure 21: Always On Jumper
Table 27: Always On Jumper Description (J39)
J39 Position
Description
Pin 1-2 Pin 2-3
X
-
Always On( Auto powers on the board when the external power supply is switched on)
-
X
Default position (Always On feature is disabled). It might be necessary to activate the power on
button (PWRBTN_IN#) on the Front Panel connector (FRONTPNL) in order to switch on the board.
-
-
Same as the default position
"X" = Jumper set and "-" = jumper not set
Don´t leave the jumper in position 1-2. If power is disconnected, the battery will fully deplete
within a few weeks.
Type
Ioh / Iol
PWR
I/O
I/O
O
O
PWR
www.kontron.com
mITX-SKL-H – User Guide, Rev.1.1
Pull U / D
Note
Pin 1 (Top)
Pin 2 (Middle)
Pin 3 (Bottom)
// 54
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