3.97inch 16BIT Module OTM8009A SKU:MRB3971

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Product Picture

MRB3973-002.jpg MRB3973-004.jpg MRB3973-003.jpg

Product Description

  • 3.97-inch color screen, support 16BIT RGB 65K color display, display rich colors
  • 800x480 resolution for clear display
  • 16-bit parallel bus transmission for fast transfer speed
  • Supports ALIENTEK STM32 Mini, Elite, WarShip, Explorer, and Apollo development boards for direct plug-in use
  • Support for touch function
  • Support SD card function expansion
  • Provides a rich sample program for STM32 and C51 platforms
  • Military-grade process standards, long-term stable work
  • Provide underlying driver technical support

Product Parameters

Name Parameter
Display Color 16BIT RGB 65K color
Screen Size  3.97(inch)
Type TFT
Driver IC OTM8009A
Resolution 800*480 (Pixel)
Module Interface 16Bit parallel interface
Active Area  51.84x86.40(mm)
Module PCB Size 59.18x111.51(mm)
Operating Temperature -20℃~60℃
Storage Temperature -30℃~70℃
Operating Voltage 3.3V/5V
Power Consumption TBD
Rough Weight(Package containing) No touch: 50 (g) / With touch: 62 (g)

Interface Definition



There is an error in the screen printing of the different mode switching resistor
in the red box of the above picture. The correct screen print is as follows:
8Bit R2,R4
16Bit R3,R4
24Bit R2,R6
Number Pin Label Description
1 CS LCD reset control pin( low level enable)
2 RS LCD register / data selection control pin(high level: register, low level: data)
3 WR LCD write control pin
4 RD LCD read control pin 
5 RST LCD reset control pin( low level reset)
6 DB0 LCD data bus low 8-bit pin
7 DB1
8 DB2
9 DB3
10 DB4
11 DB5
12 DB6
13 DB7
14 DB8 LCD data bus high 8-bit pin
15 DB9
16 DB10
17 DB11
18 DB12
19 DB13
20 DB14
21 DB15
22 NC Undefined, reserved
23 BL LCD backlight control pin(High level light)
24 VCC Module power positive pin (module has integrated voltage regulator IC, so the power supply can be connected to 5V or 3.3V)
25 VCC
26 GND Module power ground pin
27 GND
28 NC Undefined, reserved
29 MISO Touch screen SPI bus data input pin
30 MOSI Touch screen SPI bus data output pin
31 PEN Touch screen interrupt detection pin(Low level when a touch occurs)
32 NC Undefined, reserved
33 T_CS Touch screen IC chip select control pin(Low level enable)
34 CLK Touch screen SPI bus clock control pin

How to use on STM32 development board

This module is compatible with the ALIENTEK STM32 development board. The specific usage is as follows:

  • Step 1: Download the test program
  1. Download the STM32 Mini development board IO emulation or other development board FSMC test program from the Program Download column (only these programs support the STM32 development board in-line)
  2. You can also download the standard routines that come with the punctual atomic STM32 development board
  3. For a description of the relevant test procedures, please refer to the test program documentation in the package
  • Step 2: Connect the STM32 development board
  1. Find the TFTLCD interface on the development board, connect the module pins and interfaces, and then plug them directly into
the interface(for the connection method, please refer to the instructions of the ALIENTEK STM32 development board)
  • Step 3: Compile and download the program to the development board
  1. Compile and download the program you need to test to the STM32 development board( Don't know how to compile and download?
  • Step 4: Observe the running of the program
  1. After the program is finished, observe the running status of the program. If it can be displayed normally, the program runs successfully.

Program Download

Product Documentation

Reference Materials

Common Software