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HUIDU HD-M21 Specification

Check the latest HUIDU HD-M21 Specification that describes this LCD controller overview, function list,, appearance interface definition, Communication Methods. Dimensions and Technical Parameters.
HUIDU HD-M21 Specification

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.

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 
CPURK3288, Quad-core, the highest frequency 1.8GHz, Android 7.1.2
GPUMail-T764 GPU MP4 Quad-core GPU
Supports OpenGL ES1.1/2.0,OpenVG1.1,OpenCL
MemoryDDR3, 2GB by default
Built-in storage
capacity
eMMC 8GB supports 16/32 / 64GB
TF Card expansion (can be used to expand SSD)
NetworkSupport 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 rotationSupport manual rotation of 0 degrees, 90 degrees, 180 degrees, 270degrees
Display interface1 * 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
AudioSupport standard left and right channel line output
Power amplifier2 outputs (8ohms, 10 watts dual audio amplifier output)
MicrophoneDifferential MIC input
Touch screenSupport 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.
RTCBuilt-in real-time clock function
USB1 USB-2.0 HOST, 1 USB-2.0 OTG, 4 extended USB ports (one of USB share
with 4G module)
InfraredInfrared receiver, support infrared remote control function
LED1 * Power status LED (green), 1 * System LED (green, blinking by default)
Button1 * upgrade key
Serial port2 UART port, 1 DEBUG port
IO port5 IO input and output control, can be used as key scanning control
Power AdapterInput: 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 systemAndroid 7.1.2
AudioMP3, WMA, WAV, APE, FLAC, AAC, OGG, M4A, 3GPP, and other formats
VideoSupport H.264, VP8, MAV, WMV, AVS, H.263, MPEG4, and other videos
formats
1080P multi-video decoding
ImageSupport 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.
Languagesupport multi-language
InputStandard 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 watchdogSupport software watchdog

Product Size Specifications

unit:(mm)

HUIDU HD-M21 Product Size

Product Interface Diagram

HUIDU HD-M21 Interface Diagram
HUIDU HD-M21 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.

HUIDU HD-M21 PWR interface
NO.definitionAttributesDescription
612VInput12V Input
512VInput12V Input
4GNDGroundGround
3GNDGroundGround
25VSInputStandby 5Vinput
1STBOutputStandby signal output

2. MIC (Microphone) interface and definition

HUIDU HD-M21 Microphone interface
No.definitionAttributesDescription
1MIC-PInputMIC+Input
2MIC-NInputMIC-Input

3. LED/IR (Remote control) interface and definition

HUIDU HD-M21 LED IR Remote control interface
No.definitionAttributesDescription
1REDOutputRed light
25VPower5V Output
3GRNOutputGreenlight
4IOOutputRemote signal output
5IRInputRemote signal Input
6GNDGroundGround
75VPower5V Output

4. LVDS BL (LVDS backlight) interface

HUIDU HD-M21 LVDS backlight interface
No.definitionAttributesDescription
1GNDGroundGround
2GNDGroundGround
3ADJOutputBacklight brightness control
4ENOutputBacklight enable control
512VPower12V output
612VPower12V output

5. EDP BL(EDP backlight) interface and definition

HUIDU HD-M21 EDP backlight interface
No.definitionAttributesDescription
1GNDGroundGround
2GNDGroundGround
3ADJOutputBacklight brightness control
4ENOutputBacklight enable control
512VPower12Voutput
612VPower12Voutput

6.LVDS Interface and definition

HUIDU HD-M21 LVDS interface

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

In order to avoid burning boards and screens, please note the following:
  1. 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.
  2. Please use a multimeter to confirm that the power supply selected by the jumper cap is correct.
  3. When connecting the 6 / 8-bit LVDS screen cable, install it near pin1.
No.definitionAttributesDescription
1VCCPower3.3V / 5V / 12V optional output
2VCC
3VCC
4GNDGroundGround
5GNDGroundGround
6GNDGroundGround
7RXO0-OutputOdd 0-
8RXO0+OutputOdd 0+
9RXO1-OutputOdd 1-
10RXO1+OutputOdd 1+
11RXO2-OutputOdd 2-
12RXO2+OutputOdd 2+
13GNDGroundGround
14GNDGroundGround
15RXOC-OutputOdd Clock-
16RXOC+OutputOdd Clock+
17RXO3-OutputOdd 3-
18RXO3+OutputOdd 3+
19RXE0-OutputEven 0-
20RXE0+OutputEven 0+
21RXE1-OutputEven 1-
22RXE1+OutputEven 1+
23RXE2-OutputEven 2-
24RXE2+OutputEven 2+
25GNDGroundGround
26GNDGroundGround
27RXEC-OutputEven Clock-
28RXEC+OutputEven Clock+
29RXE3-OutputEven 3-
30RXE3+OutputEven 3+

7.EDP Interface and definition

This interface is a common EDP screen interface, in the form of 10 * 2 double row pins, 3.3V screen power supply。
In order to avoid burning boards and screens, please note the following:

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.

HUIDU HD-M21 EDP Interface and definition
No.definitionAttributesDescription
1VCCPoweroutput
2VCCPoweroutput
3GNDGroundGround
4GNDGroundGround
5T0POutputTrue Signal Link Lane 0
6T0NOutputComplement Signal Link Lane 0
7T1POutputTrue Signal Link Lane 1
8T1NOutputComplement Signal Link Lane 1
9T2POutputTrue Signal Link Lane 2
10T2NOutputComplement Signal Link Lane 2
11T3POutputTrue Signal Link Lane 3
12T3NOutputComplement Signal Link Lane 3
13GNDGroundGround
14GNDGroundGround
15AUPOutputTrue Auxiliary Channel
16AUNOutputComplement Signal Link Lane 0
17GNDGroundGround
18GNDGroundGround
19GNDGroundGround
20GNDGroundGround

8.USB Interface and definition

HUIDU HD-M21 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.definitionAttributesDescription
15VSPower5V Output
2DMInput / outputDM
3DPInput / outputDP
4GNDGroundGround

9.SPK (Power amplifier) interface

HUIDU HD-M21 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)

HUIDU HD-M21 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

HUIDU HD-M21 Audio interface and definition

11.KEY Interface (extension) and definition

HUIDU HD-M21 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

HUIDU HD-M21 UART (Serial Port) Port

The board have to two sets of ordinary UART serial ports, which can support the UART serial port devices on the market.

  1. Check the serial port voltage matches or not. Cannot directly connect to RS232, RS485 serial devices.
  2. 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

HUIDU HD-M21 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)

HUIDU HD-M21 4PIN RJ45 (Ethernet port)
No.DefinitionAttributesDescription
1TXPOutputOutput +
2TXNOutputOutput –
3RXPInputInput +
4RXNInputInput –

15.TP interface

HUIDU HD-M21 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

HUIDU HD-M21 16pin HDMI OUT interface
Serial numberdefinitionAttributesdescription
1H2+OutputTMDS Data2+
2H2-OutputTMDS Data2-
3H1+OutputTMDS Data1+
4H1-OutputTMDS Data1-
5H0+OutputTMDS Data0+
6H0-OutputTMDS Data0-
7HC+OutputTMDS Clock+
8HC-OutputTMDS Clock-
9CECOutputCEC
10SCLOutputSCL
11SDAOutputSDA
12HPDInputHDMI OUT hot plug detection signal
13GNDGroundedGrounded
14GNDGroundedGrounded
155V5V positiveOutput
16GNDGroundedGrounded

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

HUIDU HD-M21 Wi-Fi Update Program

2. U-disk update program

HUIDU HD-M21 U-disk update program

3. TF Card Update Program

HUIDU HD-M21 TF Card Update Program

4. Ethernet cable to Update

HUIDU HD-M21 Ethernet cable to Update

5. Internet Update

HUIDU HD-M21 Internet Update

Product Appearance

HUIDU HD-M21 LCD Controller Card
HUIDU HD-M21 LCD Controller Card
Note:

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.

HUIDU HD-M21 Specification

Check the latest HUIDU HD-M21 Specification that describes this LCD controller overview, function list,, appearance interface definition, Communication Methods. Dimensions and Technical Parameters.
HUIDU HD-M21 Specification

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.

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 
CPURK3288, Quad-core, the highest frequency 1.8GHz, Android 7.1.2
GPUMail-T764 GPU MP4 Quad-core GPU
Supports OpenGL ES1.1/2.0,OpenVG1.1,OpenCL
MemoryDDR3, 2GB by default
Built-in storage
capacity
eMMC 8GB supports 16/32 / 64GB
TF Card expansion (can be used to expand SSD)
NetworkSupport 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 rotationSupport manual rotation of 0 degrees, 90 degrees, 180 degrees, 270degrees
Display interface1 * 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
AudioSupport standard left and right channel line output
Power amplifier2 outputs (8ohms, 10 watts dual audio amplifier output)
MicrophoneDifferential MIC input
Touch screenSupport 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.
RTCBuilt-in real-time clock function
USB1 USB-2.0 HOST, 1 USB-2.0 OTG, 4 extended USB ports (one of USB share
with 4G module)
InfraredInfrared receiver, support infrared remote control function
LED1 * Power status LED (green), 1 * System LED (green, blinking by default)
Button1 * upgrade key
Serial port2 UART port, 1 DEBUG port
IO port5 IO input and output control, can be used as key scanning control
Power AdapterInput: 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 systemAndroid 7.1.2
AudioMP3, WMA, WAV, APE, FLAC, AAC, OGG, M4A, 3GPP, and other formats
VideoSupport H.264, VP8, MAV, WMV, AVS, H.263, MPEG4, and other videos
formats
1080P multi-video decoding
ImageSupport 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.
Languagesupport multi-language
InputStandard 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 watchdogSupport software watchdog

Product Size Specifications

unit:(mm)

HUIDU HD-M21 Product Size

Product Interface Diagram

HUIDU HD-M21 Interface Diagram
HUIDU HD-M21 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.

HUIDU HD-M21 PWR interface
NO.definitionAttributesDescription
612VInput12V Input
512VInput12V Input
4GNDGroundGround
3GNDGroundGround
25VSInputStandby 5Vinput
1STBOutputStandby signal output

2. MIC (Microphone) interface and definition

HUIDU HD-M21 Microphone interface
No.definitionAttributesDescription
1MIC-PInputMIC+Input
2MIC-NInputMIC-Input

3. LED/IR (Remote control) interface and definition

HUIDU HD-M21 LED IR Remote control interface
No.definitionAttributesDescription
1REDOutputRed light
25VPower5V Output
3GRNOutputGreenlight
4IOOutputRemote signal output
5IRInputRemote signal Input
6GNDGroundGround
75VPower5V Output

4. LVDS BL (LVDS backlight) interface

HUIDU HD-M21 LVDS backlight interface
No.definitionAttributesDescription
1GNDGroundGround
2GNDGroundGround
3ADJOutputBacklight brightness control
4ENOutputBacklight enable control
512VPower12V output
612VPower12V output

5. EDP BL(EDP backlight) interface and definition

HUIDU HD-M21 EDP backlight interface
No.definitionAttributesDescription
1GNDGroundGround
2GNDGroundGround
3ADJOutputBacklight brightness control
4ENOutputBacklight enable control
512VPower12Voutput
612VPower12Voutput

6.LVDS Interface and definition

HUIDU HD-M21 LVDS interface

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

In order to avoid burning boards and screens, please note the following:
  1. 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.
  2. Please use a multimeter to confirm that the power supply selected by the jumper cap is correct.
  3. When connecting the 6 / 8-bit LVDS screen cable, install it near pin1.
No.definitionAttributesDescription
1VCCPower3.3V / 5V / 12V optional output
2VCC
3VCC
4GNDGroundGround
5GNDGroundGround
6GNDGroundGround
7RXO0-OutputOdd 0-
8RXO0+OutputOdd 0+
9RXO1-OutputOdd 1-
10RXO1+OutputOdd 1+
11RXO2-OutputOdd 2-
12RXO2+OutputOdd 2+
13GNDGroundGround
14GNDGroundGround
15RXOC-OutputOdd Clock-
16RXOC+OutputOdd Clock+
17RXO3-OutputOdd 3-
18RXO3+OutputOdd 3+
19RXE0-OutputEven 0-
20RXE0+OutputEven 0+
21RXE1-OutputEven 1-
22RXE1+OutputEven 1+
23RXE2-OutputEven 2-
24RXE2+OutputEven 2+
25GNDGroundGround
26GNDGroundGround
27RXEC-OutputEven Clock-
28RXEC+OutputEven Clock+
29RXE3-OutputEven 3-
30RXE3+OutputEven 3+

7.EDP Interface and definition

This interface is a common EDP screen interface, in the form of 10 * 2 double row pins, 3.3V screen power supply。
In order to avoid burning boards and screens, please note the following:

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.

HUIDU HD-M21 EDP Interface and definition
No.definitionAttributesDescription
1VCCPoweroutput
2VCCPoweroutput
3GNDGroundGround
4GNDGroundGround
5T0POutputTrue Signal Link Lane 0
6T0NOutputComplement Signal Link Lane 0
7T1POutputTrue Signal Link Lane 1
8T1NOutputComplement Signal Link Lane 1
9T2POutputTrue Signal Link Lane 2
10T2NOutputComplement Signal Link Lane 2
11T3POutputTrue Signal Link Lane 3
12T3NOutputComplement Signal Link Lane 3
13GNDGroundGround
14GNDGroundGround
15AUPOutputTrue Auxiliary Channel
16AUNOutputComplement Signal Link Lane 0
17GNDGroundGround
18GNDGroundGround
19GNDGroundGround
20GNDGroundGround

8.USB Interface and definition

HUIDU HD-M21 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.definitionAttributesDescription
15VSPower5V Output
2DMInput / outputDM
3DPInput / outputDP
4GNDGroundGround

9.SPK (Power amplifier) interface

HUIDU HD-M21 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)

HUIDU HD-M21 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

HUIDU HD-M21 Audio interface and definition

11.KEY Interface (extension) and definition

HUIDU HD-M21 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

HUIDU HD-M21 UART (Serial Port) Port

The board have to two sets of ordinary UART serial ports, which can support the UART serial port devices on the market.

  1. Check the serial port voltage matches or not. Cannot directly connect to RS232, RS485 serial devices.
  2. 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

HUIDU HD-M21 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)

HUIDU HD-M21 4PIN RJ45 (Ethernet port)
No.DefinitionAttributesDescription
1TXPOutputOutput +
2TXNOutputOutput –
3RXPInputInput +
4RXNInputInput –

15.TP interface

HUIDU HD-M21 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

HUIDU HD-M21 16pin HDMI OUT interface
Serial numberdefinitionAttributesdescription
1H2+OutputTMDS Data2+
2H2-OutputTMDS Data2-
3H1+OutputTMDS Data1+
4H1-OutputTMDS Data1-
5H0+OutputTMDS Data0+
6H0-OutputTMDS Data0-
7HC+OutputTMDS Clock+
8HC-OutputTMDS Clock-
9CECOutputCEC
10SCLOutputSCL
11SDAOutputSDA
12HPDInputHDMI OUT hot plug detection signal
13GNDGroundedGrounded
14GNDGroundedGrounded
155V5V positiveOutput
16GNDGroundedGrounded

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

HUIDU HD-M21 Wi-Fi Update Program

2. U-disk update program

HUIDU HD-M21 U-disk update program

3. TF Card Update Program

HUIDU HD-M21 TF Card Update Program

4. Ethernet cable to Update

HUIDU HD-M21 Ethernet cable to Update

5. Internet Update

HUIDU HD-M21 Internet Update

Product Appearance

HUIDU HD-M21 LCD Controller Card
HUIDU HD-M21 LCD Controller Card
Note:

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.

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