HUIDU HD-M21 Specification
Here is the HUIDU HD-M21 Specification to help you know more about HD-M21 LCD Controller overview, Connection methods, features list, Appearance description, Dimensions definition, Technical Parameters, etc.
- V3.0 20210703
Product Description
1.Overview
HD-M21 is a well-built all-in-one motherboard, using Rockchip RK3288 quad-core chip solution, equipped with Android 7.1.2 system, the main frequency is up to 1.8GHz, with a super
performance. Adopts Mali-T764 GPU, supports AFBC (Frame Slow Slave Compression), 4K/H.265 hard decoding, 1080P video decoding, HDMI interface 4K output, 4K video playback.
Supports infrared remote control, Wi-Fi, RJ45, and other rich interfaces to make the product more versatile. It is widely used in advertising, interactive all-in-one, security, medical, transportation, finance, industrial control, and other intelligent control fields, which can accelerate the Product
development cycle. Due to its hardware platform and Android’s intelligent characteristics, when it is necessary to perform human-computer interaction and network device interaction, it can be used on the smart terminal motherboard, which can become your best choice.
HD-M21 is standard with 2.4GHz frequency Wi-Fi module (optional 5GHz frequency), supports Bluetooth 4.2, support sending programs via Bluetooth.
2.Features
- High performance. Uses a quad-core ARM Cortex-A17 architecture, the main frequency can be as high as 1.8GHz, compared with the single-core, dual-core, and quad-core
solutions common in the market. It has a qualitative leap in performance, can play high-definition video in various formats, and can handle complex interactive operations. - High stability. RK3288 Android integrated board, in hardware and software, add your own unique technology to ensure the stability of the product, can make the final product 7 * 24
hours unattended. - High integration. RK3288 Android integrated board integrates Ethernet, EDP, Wi-Fi, power amplifier, TF expansion card, USB expansion port, IR remote control function, HDMI, LVDS, backlight control, microphone, and other functions, greatly simplifying the overall design.
- High scalability. SIX expansion USB ports (4 ports are PIN type, 2 ports are standard type), 2 serial ports + 1 expandable debug serial port, and five IO expansion ports can expand more peripheral devices.
- High definition. Supporting various LVDS / EDP / HDMI interfaces and cropping screens of various sizes and resolutions.
- Perfectly support multiple mainstream touch screen functions such as multi-point infrared touch, multi-point capacitive touch, multi-point nano film touch, multi-point acoustic wave touch, multi-point optical touch, etc.
Basic Parameters
1. Hardware Parameters
| Hardware specifications | |
| CPU | RK3288, Quad-core, the highest frequency 1.8GHz， Android 7.1.2 |
| GPU | Mail-T764 GPU MP4 Quad-core GPU Supports OpenGL ES1.1/2.0,OpenVG1.1,OpenCL |
| Memory | DDR3, 2GB by default |
| Built-in storage capacity | eMMC 8GB supports 16/32 / 64GB TF Card expansion (can be used to expand SSD) |
| Network | Support RJ45 R / A 100M Ethernet, support Ethernet. Supports 2.4G / 5G Wi-Fi and Wi-Fi 802.11b / g / n protocols. Support Bluetooth 4.2, sending program by Bluetooth |
| Image rotation | Support manual rotation of 0 degrees, 90 degrees, 180 degrees, 270degrees |
| Display interface | 1 * LVDS interface (single / dual, 6-bit /8-bit), support 3.3V / 5V /12V power supply 1 EDP interface, 1 HDMI1.4 interface, support 4K output Support dual-screen simultaneous display function can directly drive interface LCD screen with multiple resolutions Onboard backlight control supports 12V backlight power supply |
| Audio | Support standard left and right channel line output |
| Power amplifier | 2 outputs (8ohms, 10 watts dual audio amplifier output) |
| Microphone | Differential MIC input |
| Touch screen | Support USB multi-point infrared touch,multi-point capacitive touch, multi- point nano film touch, multi-point acoustic wave Touch, multi-point optical touch, and more. |
| RTC | Built-in real-time clock function |
| USB | 1 USB-2.0 HOST, 1 USB-2.0 OTG, 4 extended USB ports (one of USB share with 4G module) |
| Infrared | Infrared receiver, support infrared remote control function |
| LED | 1 * Power status LED (green), 1 * System LED (green, blinking by default) |
| Button | 1 * upgrade key |
| Serial port | 2 UART port, 1 DEBUG port |
| IO port | 5 IO input and output control, can be used as key scanning control |
| Power Adapter | Input: AC100-240V.50-60HZ, Output: DC12V 1.5A (Requires surge voltage less than 18V and ripple voltage less than 100mV) |
2. Software Parameters
| Software Specifications | |
| operating system | Android 7.1.2 |
| Audio | MP3, WMA, WAV, APE, FLAC, AAC, OGG, M4A, 3GPP, and other formats |
| Video | Support H.264, VP8, MAV, WMV, AVS, H.263, MPEG4, and other videos formats 1080P multi-video decoding |
| Image | Support various image formats such as JPG, BMP, PNG |
| System comes with application software | APK Installer, Email, Calculator, Browser, Recorder, Calendar, Settings, Clock, Video Player, Search, Contacts, Gallery, Download, Camera, Music, Explorer, etc. |
| Language | support multi-language |
| Input | Standard Android keyboard with the optional third-party input method |
| System Management | Original ecological Android system, open root permissions, and can customize product development |
| Real-time remote monitoring, system crash self-recovery, unattended 7 * 24 hours | |
| Support OTA remote upgrade; support U disk upgrade | |
| Support boot animation definition | |
| Support server / stand-alone mode switching | |
| Support Wi-Fi hotspot | |
| System watchdog | Support software watchdog |
Product Size Specifications
unit：（mm）
Product Interface Diagram
Interface Parameter Description
1. PWR / DC (power input) interface
It adopts 12V DC power supply and only allows the board subsystem to be powered from the DC socket and power socket.
| NO. | definition | Attributes | Description |
| 6 | 12V | Input | 12V Input |
| 5 | 12V | Input | 12V Input |
| 4 | GND | Ground | Ground |
| 3 | GND | Ground | Ground |
| 2 | 5VS | Input | Standby 5Vinput |
| 1 | STB | Output | Standby signal output |
2. MIC (Microphone) interface and definition
| No. | definition | Attributes | Description |
| 1 | MIC-P | Input | MIC+Input |
| 2 | MIC-N | Input | MIC-Input |
3. LED/IR (Remote control) interface and definition
| No. | definition | Attributes | Description |
| 1 | RED | Output | Red light |
| 2 | 5V | Power | 5V Output |
| 3 | GRN | Output | Greenlight |
| 4 | IO | Output | Remote signal output |
| 5 | IR | Input | Remote signal Input |
| 6 | GND | Ground | Ground |
| 7 | 5V | Power | 5V Output |
4. LVDS BL (LVDS backlight) interface
| No. | definition | Attributes | Description |
| 1 | GND | Ground | Ground |
| 2 | GND | Ground | Ground |
| 3 | ADJ | Output | Backlight brightness control |
| 4 | EN | Output | Backlight enable control |
| 5 | 12V | Power | 12V output |
| 6 | 12V | Power | 12V output |
5. EDP BL（EDP backlight) interface and definition
| No. | definition | Attributes | Description |
| 1 | GND | Ground | Ground |
| 2 | GND | Ground | Ground |
| 3 | ADJ | Output | Backlight brightness control |
| 4 | EN | Output | Backlight enable control |
| 5 | 12V | Power | 12Voutput |
| 6 | 12V | Power | 12Voutput |
6.LVDS Interface and definition
General LVDS interface definition, support single / dual, 6/8 / 10-bit 1080P LVDS screen. The screen voltage can be selected through a jumper cap, and it can be selected to support 3.3V / 5V / 12V screen power supply
- Please confirm whether the screen specification book screen supply voltage is correct, whether the board’s corresponding power supply can meet the maximum working current of the screen.
- Please use a multimeter to confirm that the power supply selected by the jumper cap is correct.
- When connecting the 6 / 8-bit LVDS screen cable, install it near pin1.
| No. | definition | Attributes | Description |
| 1 | VCC | Power | 3.3V / 5V / 12V optional output |
| 2 | VCC | ||
| 3 | VCC | ||
| 4 | GND | Ground | Ground |
| 5 | GND | Ground | Ground |
| 6 | GND | Ground | Ground |
| 7 | RXO0- | Output | Odd 0- |
| 8 | RXO0+ | Output | Odd 0+ |
| 9 | RXO1- | Output | Odd 1- |
| 10 | RXO1+ | Output | Odd 1+ |
| 11 | RXO2- | Output | Odd 2- |
| 12 | RXO2+ | Output | Odd 2+ |
| 13 | GND | Ground | Ground |
| 14 | GND | Ground | Ground |
| 15 | RXOC- | Output | Odd Clock- |
| 16 | RXOC+ | Output | Odd Clock+ |
| 17 | RXO3- | Output | Odd 3- |
| 18 | RXO3+ | Output | Odd 3+ |
| 19 | RXE0- | Output | Even 0- |
| 20 | RXE0+ | Output | Even 0+ |
| 21 | RXE1- | Output | Even 1- |
| 22 | RXE1+ | Output | Even 1+ |
| 23 | RXE2- | Output | Even 2- |
| 24 | RXE2+ | Output | Even 2+ |
| 25 | GND | Ground | Ground |
| 26 | GND | Ground | Ground |
| 27 | RXEC- | Output | Even Clock- |
| 28 | RXEC+ | Output | Even Clock+ |
| 29 | RXE3- | Output | Even 3- |
| 30 | RXE3+ | Output | Even 3+ |
7.EDP Interface and definition
Confirm that the screen specification book screen supply voltage is correct and whether the board’s corresponding power supply can meet the screen’s maximum working current.
| No. | definition | Attributes | Description |
| 1 | VCC | Power | output |
| 2 | VCC | Power | output |
| 3 | GND | Ground | Ground |
| 4 | GND | Ground | Ground |
| 5 | T0P | Output | True Signal Link Lane 0 |
| 6 | T0N | Output | Complement Signal Link Lane 0 |
| 7 | T1P | Output | True Signal Link Lane 1 |
| 8 | T1N | Output | Complement Signal Link Lane 1 |
| 9 | T2P | Output | True Signal Link Lane 2 |
| 10 | T2N | Output | Complement Signal Link Lane 2 |
| 11 | T3P | Output | True Signal Link Lane 3 |
| 12 | T3N | Output | Complement Signal Link Lane 3 |
| 13 | GND | Ground | Ground |
| 14 | GND | Ground | Ground |
| 15 | AUP | Output | True Auxiliary Channel |
| 16 | AUN | Output | Complement Signal Link Lane 0 |
| 17 | GND | Ground | Ground |
| 18 | GND | Ground | Ground |
| 19 | GND | Ground | Ground |
| 20 | GND | Ground | Ground |
8.USB Interface and definition
The board has 2 USB standard interfaces (the left one is device mode), 2 built-in USB sockets for peripheral expansion.
| No. | definition | Attributes | Description |
| 1 | 5VS | Power | 5V Output |
| 2 | DM | Input / output | DM |
| 3 | DP | Input / output | DP |
| 4 | GND | Ground | Ground |
9.SPK (Power amplifier) interface
No. | definition | Attributes | Description |
1 | OUTP-R | Output | Right channel + |
2 | OUTN-R | Output | Right channel- |
3 | OUTN-L | Output | Left channel- |
4 | OUTP-L | Output | Left channel+ |
10.L/R (Audio interface and definition)
No. | definition | Attributes | Description |
1 | LO-L | Output | Left channel |
2 | LO-R | Output | Right channel |
3 | GND | Ground | Ground |
4 | NC | NC | No definition |
11.KEY Interface (extension) and definition
No. | definition | Attributes | Description |
1 | GND | Ground | GroundD |
2 | K5 | K5 | K5 |
3 | K4 | K4 | K4 |
4 | K3 | K3 | K3 |
5 | K2 | K2 | K2 |
6 | K1 | K1 | K1 |
7 | 3V3 | Power | 3.3V output |
12.UART (Serial Port) Port*2
The board have to two sets of ordinary UART serial ports, which can support the UART serial port devices on the market.
- Check the serial port voltage matches or not. Cannot directly connect to RS232, RS485 serial devices.
- TX，RX Please confirm the connection is correct or not
No. | Definition | Attributes | Description |
1 | 5V | Power | 5V output |
2 | TX | Output | TX |
3 | RX | Input | RX |
4 | GND | Ground | Ground |
13.DEBUG interface
No. | Definition | Attributes | Description |
1 | 3V3 | Power | 3.3VOutput |
2 | TX | Output | TX |
3 | RX | Input | RX |
4 | GND | Ground | Ground |
14.4PIN RJ45 (Ethernet port)
| No. | Definition | Attributes | Description |
| 1 | TXP | Output | Output + |
| 2 | TXN | Output | Output – |
| 3 | RXP | Input | Input + |
| 4 | RXN | Input | Input – |
15.TP interface
No. | Definition | Attributes | Description |
1 | 3V3 | power supply | 3.3V output |
2 | SCL | Input/out | I2C clock |
3 | SDA | Input/out | I2C data |
4 | INT | Input/out | Interrupt |
5 | RST | Input/out | Reset |
6 | GND | Grounded | Grounded |
16. 16pin HDMI OUT interface
| Serial number | definition | Attributes | description |
| 1 | H2+ | Output | TMDS Data2+ |
| 2 | H2- | Output | TMDS Data2- |
| 3 | H1+ | Output | TMDS Data1+ |
| 4 | H1- | Output | TMDS Data1- |
| 5 | H0+ | Output | TMDS Data0+ |
| 6 | H0- | Output | TMDS Data0- |
| 7 | HC+ | Output | TMDS Clock+ |
| 8 | HC- | Output | TMDS Clock- |
| 9 | CEC | Output | CEC |
| 10 | SCL | Output | SCL |
| 11 | SDA | Output | SDA |
| 12 | HPD | Input | HDMI OUT hot plug detection signal |
| 13 | GND | Grounded | Grounded |
| 14 | GND | Grounded | Grounded |
| 15 | 5V | 5V positive | Output |
| 16 | GND | Grounded | Grounded |
17. Other interfaces
Storage interface | SD card | Data storage, up to 32G |
USB | HOST interface, support data storage, data import, USB mouse keyboard, camera, touch screen, etc. | |
Ethernet interface | RJ45 interface | Support 100M wired network |
HDMI interface | Standard interface | Support HDMI output, maximum support 4K |
3G/4G | PCI-E standard interface | Support various |
SIM card interface | Standard interface | Support various standards (depending on 3G / 4G module) |
Communication Methods
1. Wi-Fi Update Program
2. U-disk update program
3. TF Card Update Program
4. Ethernet cable to Update
5. Internet Update
Product Appearance
1. The 4G module is an optional accessory that is installed on the PCI-E port. If the picture is different from the actual product, it is not a fake or inferior product. If you have any questions, please contact us for confirmation.
2. The model label is attached to the sales product. The product picture in the specification is different from the actual product. It is not a fake or inferior product. If you have any questions, please contact us for confirmation.
Statement
This HUIDU HD-M21 Specification is just for reference only, if you have any problems during using this LCD Controller or have any questions about this datasheet, please contact the HUIDU tech department.