STMicroelectronics B-LCD40-DSI1

Overview

B-LCD40-DSI1 from STMicroelectronics is a 4-inch WVGA TFT LCD daughterboard with MIPI® DSI interface and integrated capacitive touch panel, supporting up to two-lane DSI data transmission, 480×800 RGB resolution, 16.7M colors, and single/two-point touch with gesture recognition. It operates from a 2.8–3.3 V supply for display and touch circuitry and requires 5 V for backlight drive.

For engineers reviewing the B-LCD40-DSI1 datasheet, B-LCD40-DSI1 pinout, B-LCD40-DSI1 application, or B-LCD40-DSI1 equivalent, this board is intended as an optional display add-on for STM32F769I-DISCO and evaluation boards including STM32F769I-EVAL, STM32F779I-EVAL, STM32F469I-EVAL, and STM32F479I-EVAL - enabling rapid UI prototyping in embedded HMI development.

Technical Context

The B-LCD40-DSI1 implements a self-capacitive touch panel controlled via I²C (not DSI), while display pixel data and timing are delivered exclusively over the MIPI® DSI interface with configurable lane count (1 or 2 lanes) and support for video mode operation. The board includes level-shifting circuitry to interface with STM32 discovery/evaluation boards' DSI PHY and touch controller GPIOs.

It integrates dedicated power regulation for the LCD panel and touch sensor (2.8–3.3 V), separate 5 V backlight driver circuitry with current-limiting, and mechanical mounting features compatible with ST's standard 20-pin DSI connector (CN2) on target boards.

Key Specifications

Availability

B-LCD40-DSI1 is available at Aetrix Electronics and suitable for STM32-based HMI development, industrial display prototyping, and embedded GUI validation requiring stable component supply and documented board-level integration.

Supply support for B-LCD40-DSI1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, analog ICs, MEMS, and power devices for industrial, automotive, and consumer applications.

The B-LCD40-DSI1 belongs to ST's STM32 ecosystem evaluation hardware family, developed specifically to accelerate graphical user interface development and DSI interface validation for STM32F4/F7 series MCUs with integrated DSI host controllers.

FAQ

Is the B-LCD40-DSI1 compatible with STM32H7 series discovery boards?

No. The B-LCD40-DSI1 is mechanically and electrically designed for STM32F469I/F479I/F769I/F779I discovery and evaluation boards only. STM32H7 series boards use different DSI PHY configurations, connector pinouts, and power sequencing - no official support or adapter is provided by ST.

Does the board include a built-in DSI-to-RGB bridge or require MCU-side DSI controller support?

The B-LCD40-DSI1 has no internal bridge; it requires a host MCU with native MIPI® DSI transmitter capability (e.g., STM32F769I). The board accepts raw DSI packets and drives the LCD panel directly using its integrated timing controller and source/gate drivers.

What touch controller IC is used, and is its firmware upgradable?

The board uses ST's TSC (Touch Sensing Controller) interface routed to the host MCU's I²C bus; no standalone touch IC is present. Touch processing is performed in firmware on the host STM32, and calibration parameters are stored in MCU flash - fully upgradable via application code updates.

Can the backlight brightness be PWM-controlled through the board?

Yes. The 5 V backlight supply includes a dedicated PWM input (BL_EN/BL_PWM pin) referenced to the host board's DSI connector, allowing dynamic brightness control from the STM32's TIM peripheral without external components.