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DIMM.AM335x (Rev3) 11/24

3 additional GPIO output signals are provided to control the power supply of the display and the

backlight.

Signal

Description

LCD_VEPWC

Optional display power control output, driven by GPIO1_29

LCD_VCPWC

Optional display power control output, driven by GPIO2_27

LCD_DON

Display power enable signal, driven by GPIO2_2

Signal is used to switch the backlight power (“0” backlight off; “1” backlight on)

3.9 Touch Interface

A 4-wire resistive touch screen controller is incorporated in the processor AM335x.

The 4 touch interface signals TOUCH_XP, TOUCH_XM, TOUCH_YP and TOUCH_YM are available at

the SODIMM connector.

3.10 Audio Interface

The serial interface MCASP1 of the processor AM335x is available as I2S audio interface at the

SODIMM connector to connect an external audio codec.

The interface can be operated in master or slave mode. Different clocks for receive and transmit are

possible.

3.11 CAN Controller

Two CAN interfaces are incorporated in the processor AM335x. Both interfaces support CAN

specification V2.0B with up to 1Maud transfer rate. The message RAMs can store 64 message

objects.

The receive line and the transmit line of the controller CAN0 are available at the specified pins of

the SODIMM connector. The signals have LVTTL level and an appropriate CAN transceiver must be

added externally.

The signal lines of the second CAN controller CAN1 are optionally available at the pins RTS and CTS

of UART3.

3.12 SDC/SDIO Interface

The processor AM335x incorporates 3 SDC/SDIO interfaces which are compatible to the SD Physical

Layer specification 3.0. All interfaces have 8 data lines and provide inputs for card detect and write

protect status.

The interface MMC0 is unavailable because of pin multiplexing.

The interface MMC1 is used onboard to connect the NAND flash. All 8 data lines are used for the

flash interface.

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