Interface Details

Front interfaces

No.	Interface	Purpose
1	HDMI IN	HDMI input through LT6911C
2	HDMI OUT	Native A733 HDMI output
3	Gigabit Ethernet	RTL8211F over RGMII
4	USB 3.0	USB 3.0 Host
5	USB 2.0 Type-A	USB 2.0 Host
6	Type-C	OTG, firmware download and ADB
7	4-pin power	Auxiliary 12 V input
8	DC jack	12 V input
9	Fan	12 V fan
10	Battery	Battery input and temperature sense
11	External keys	BOOT, RST and PWRON
12	Headphone	Headphone/headset output
13	Speakers	Stereo speaker outputs
14	Microphones	Two analog microphone inputs
15	TF card	Boot or data storage
16	eDP display	40-pin eDP connector
17	MIPI display	30-pin MIPI DSI connector
18	MIPI camera	30-pin 4-lane MIPI CSI connector
19	Keys	VOL-, VOL+, RST, BOOT and PWRON
20	Wi-Fi/BT	AW869A module
21	Debug UART	UART0, 4-pin 1.25 mm connector
22	4-pin USB	Three USB 2.0 headers
23	Flash LED	3.3 V flash-light connector
24	LT6911C programming	LT6911C configuration/programming

Rear interface

The rear M.2 socket is intended for storage expansion. Supported keying, protocol, device length and power capability must be confirmed against the schematic and BOM.

Power and battery

The board uses 12 V DC input; a 12 V / 3 A adapter is recommended. The DC jack and the 4-pin connector are 12 V input paths and polarity must be verified before connection.

The battery connector exposes VBAT, TS and GND. TS is the battery temperature-sense signal and must not be treated as a power pin.

USB

• Type-C is the OTG/device port for PhoenixSuit and ADB.
• One Type-A connector provides USB 3.0 Host.
• FE1.1S expands USB 2.0 into one Type-A port and three 4-pin headers.
• The headers can be used for USB touch panels and other USB 2.0 devices.

HDMI input/output

HDMI OUT is native to A733. HDMI IN is converted to MIPI CSI by LT6911C and is exposed to software as a capture/camera pipeline:

HDMI Source -> LT6911C -> MIPI CSI -> CSI/ISP/VIPP -> Android Application

Debugging must include LT6911C firmware, I2C, reset, interrupt, MIPI lanes, video format and the media graph.

Display and camera

• The MIPI DSI connector includes four data lanes, clock, panel rails, touch I2C/interrupt/reset, backlight PWM and panel reset.
• The eDP connector includes four main lanes, AUX, HPD, 3.3 V panel power, 12 V backlight power, enable/PWM and touch I2C.
• The MIPI CSI connector includes four data lanes, clock, I2C, MCLK, reset/standby and camera supply rails.

See Connector Pinout for complete tables.

Audio, keys and cooling

• Two differential MICP/MICN microphone connectors are provided.
• Stereo speaker outputs are rated at 3 W@8 Ω.
• Onboard keys are VOL-, VOL+, RST, BOOT and PWRON.
• The fan connector outputs 12 V and must not be used with a 5 V fan.