The V853 chip integrates A7 + E907 + 1T NPU, featuring a tri-core heterogeneous architecture and rich audio and video interfaces. It is configured with 512M DDR and 8G eMMC, and also integrates LED, WiFi, Bluetooth, Ethernet, audio, screen, USB, TF card, and other modules. To facilitate developers in understanding the onboard resources and quickly getting started with the development board for free development, this article will explain the schematics of several main components of the development board, helping you understand the V853 development board schematic in one go.
Development Board Hardware Block Diagram
GPIO Allocation
This table is the allocation table for some important GPIOs of the V853, where > indicates another multiplexing of IO. For complete GPIO allocation, please refer to the schematic.
DRAM (DDR3)
The development board uses RS256M16VRDK DDR3 512MB memory produced by Rayson, in BGA96 packaging.
The following diagram shows the DRAM schematic, where the SDQ signal lines at the grain end are disordered due to the characteristics of DDR itself. The order of SDQ lines within the group can be changed, divided into two groups: the first group SDQ0-SDQ7 + SDQSN/P0 + SDQM0, the second group SDQ8-SDQ16 + SDQSN/P1 + SDQM1, which facilitates PCB wiring for the memory.
The V853 chip supports dual-stacked DRAM and also supports single-stacked dual-RANK DRAM, with a maximum of 8Gb.
Memory (eMMC)
The development board memory uses the AT70B08G3 eMMC designed by Zhuhai Miaocun Technology, with a capacity of 8GB, operating in 8bit mode.
PC2 and PC3 pins are the BOOT SEL boot order selection pins, executed by pull-up or pull-down.
The development board reserves pads for SPI NOR and SPI NAND, which can be soldered with SPI NOR or SPI NAND storage supported by the V853 chip.
MIPI Camera (MIPI CSI)
The V853 development board is equipped with a 40Pin FPC connector that exposes all MIPI CSI resources, supporting dual 2-lane cameras and a single 4-lane camera. The development board provides a default 1080P dual-lens camera solution, model: GC2063.
DVP Camera (DVP CSI)
The V853 development board uses a header connector to expose the IO required for DVP. Due to the multiplexing relationship of the PE interface, please pay attention to its multiplexing relationship when used.
Screen (LCD)
The V853 development board is equipped with a 7-inch LCD screen, accompanied by a corresponding capacitive touchscreen.
The screen uses the MIPI DSI interface, connected to the corresponding MIPI LCD FPC connector on the board, while the touchscreen is connected to the CTP interface.
At the same time, the development board has exposed an RGB666 FPC connector, which can connect to an RGB screen (with touch).
Audio Input Section (MICIN, LINEIN)
The V853 development board provides two MIC audio inputs and LINE input. When using LINE input, it reuses the MIC interface. Using the internal audio Codec, it can also use the Inter-IC Sound (I2S) bus to connect external digital Codec for microphone array and sound source localization.
Audio Output Section (LINEOUT)
This table shows that the V853 provides a differential audio output interface and connects to a speaker using the CG8302 amplifier. Audio output uses the internal audio Codec, and it can also use the Inter-IC Sound (I2S) bus to connect external digital Codec for better sound quality. The GPIO allocation table, where > indicates another multiplexing of IO. For complete GPIO allocation, please refer to the schematic.
MICRO SD Card (TF CARD)
The Micro SD card (also known as TF card) features a self-ejecting TF card slot, with all pins protected by ESD devices.
The development board reserves a management circuit for the Micro SD card power supply to prevent burning low-resistance Micro SD cards, but this protection circuit is not installed by default.
The SDIO interface used by the MicroSD card has internal pull-up, eliminating the need for external pull-up circuitry.
GPIO Allocation
The V853 development board is equipped with the IP101GR hundred-megabit Ethernet transceiver, which connects to the internet via an Ethernet cable.
Wireless Network (WIRELESS NETWORK)
The V853 development board is equipped with the XR829 Wi-Fi and Bluetooth module, supporting 2.4G IEEE 802.11 b/g/n WLAN, Bluetooth v2.1/4.0/4.2. Wi-Fi communicates with the V853 through the SDIO bus, while Bluetooth communicates via UART.
Power (POWER TREE)
The development board uses the AXP2101 PMU, also developed by Allwinner, as the power management module. It supports DC 12V input, USB 5V input, and battery input. It communicates with the V853 via the TWI bus.
The AXP2101 is a universal PMU that can adapt to various chips, providing multiple power outputs. Unused power sections can be turned off.
Power output distribution is shown in the diagram below (red indicates enabled power output, black indicates disabled power output).
Buttons (KEY)
The V853 development board has a total of 8 buttons, including VOL+ VOL- MENU ENTER HOME buttons connected to the GPADC. The button values are recognized by identifying the current ADC voltage. The UBOOT button is connected to the FEL pin on the V853 chip, allowing for firmware debugging operations when pressed.
There are also PWR and RESET buttons connected to the AXP2101 PMU, used for powering on and resetting the chip.
Serial Port (UART)
The V853 development board provides 2 independent UART debugging ports, UART0 and UART3, with UART0 configured as the Arm core debugging port and UART3 as the E907 core debugging port by default.
UART3 can also be reused as a GPS communication interface, connected via a 3.5mm connector.
The schematic for the V853 development board will also be provided by Allwinner online on their official website. You can click on 【Read the original text】 to jump to the V853 online documentation or copy the link to download it for free.
V853 Data Download Link:
https://www.aw-ol.com/downloads?cat=17
The Allwinner V853 development board was officially announced and released a few days ago. At the same time, Allwinner also provided a trial application activity for developers. The application questionnaire is still being collected, and everyone is welcome to continue submitting trial applications (it is said that the more detailed the questionnaire, the greater the chance of receiving the development board!).
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Editor: Budbool
Technical Advisors: Kirin, Styer, Sochip
