Hardware Documentation efus™A9X+ efus™A9Xr2
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4.6 I2C
The module supports a I2C interface as I2C master. Signals are 3.3V compliant and do have
pull-up on module. Devices on baseboard with other voltage need a level shifter.
82
I2C_B_DAT
Data signal
4k7 PU onboard
84
I2C_B_CLK
Clock signal
4k7 PU onboard
86
I2C_B_IRQ
Optional interrupt input
100k PU onboard
88
I2C_B_RST
Optional reset output
100k PU onboard
A second I2C output is reserved for display control and a touch controller for resistive or
capacitive touch.
151 I2C_A_DAT
Data signal for touch controller
4k7 PU onboard
155 I2C_A_CLK
Clock signal for touch controller
4k7 PU onboard
153 I2C_A_IRQ
Interrupt input for touch controller
100k PU onboard
157 I2C_A_RST
Reset output for touch controller
100k PU onboard
A third I2C output is reserved for DVI DDC, sound codec programming, mPCIe SMB and
camera programming.
It is shared on the module with RTC I2C signals, the I2C on the LVDS connector and the
optional on-board I2C EEProm.
We don’t recommend to use this signal for other functions.
130 I2C_C_DAT
Data signal
4k7 PU onboard
132 I2C_C_CLK
Clock signal
4k7 PU onboard
