4.0inch 8&16BIT Module ST7796S SKU:MRB3951

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Revision as of 17:36, 7 May 2019 by Lin (talk | contribs) (Interface Definition)
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Product Video

Product Picture

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Product Description

  • 4.0-inch color screen, support 16BIT RGB 65K color display, display rich colors
  • 320x480 resolution for clear display
  • Supports 8-bit and 16-bit parallel bus transmission with fast transfer speed
  • Supports ALIENTEK STM32 Mini, Elite, WarShip, Explorer, and Apollo development boards TFTLCD 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
SKU MRB3951
Screen Size  4.0(inch)
Type TFT
Driver IC ST7796S
Resolution 480*320 (Pixel)
Module Interface 8bit or 16Bit parallel interface
Active Area  83.52x55.68(mm)
Module PCB Size 61.98x108.80 (mm)
Operating Temperature -10℃~60℃
Storage Temperature -20℃~70℃
Operating Voltage 3.3V~5V
Power Consumption TBD
Product Weight TBD

Interface Definition

8-bit and 16-bit data bus mode switching circuits in the blue box (this module uses 16-bit mode)

MRB3951-005.jpg

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 (not used in 8-bit data bus mode)
15 DB9
16 DB10
17 DB11
18 DB12
19 DB13
20 DB14
21 DB15
22 SDCS SD card selection control pin (used when using the SD card expansion function, this test program is not used)
23 BL LCD backlight control pin(High level light)
24 VDD Module power positive pin (module has integrated voltage regulator IC, so the power supply can be connected to 5V or 3.3V)
25 VDD
26 GND Module power ground pin
27 GND
28 NC LCD backlight power positive pin (default shared onboard backlight power supply, this pin can not be connected)
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 FCS Flash chip select control pin (used when using the Flash extension function, this test program is not used)
33 T_CS Touch screen IC chip select control pin(Low level enable)
34 CLK Touch screen SPI bus clock control pin

Product Documentation

Program Download

Reference Materials

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. 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.

Common Software

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