company news about Understanding the Interface and Power Sequencing of the SFTC400B-8951AN TFT Module

For embedded systems engineers, integrating a TFT display involves more than just picking a resolution. Interface compatibility, power sequencing, and signal integrity are just as important. Let’s take a closer look at the SFTC400B-8951AN—a 4-inch square TFT module from Saef Technology Limited—and explore what makes it a technically sound choice for professional applications.

Flexible Dual-Interface Support

This module supports both 3-wire SPI and RGB interfaces, allowing designers to choose the best fit for their MCU or FPGA. The RGB interface uses 18 data lines (6 per color) and standard sync signals (HSYNC, VSYNC, DE, PCLK), making it compatible with most display controllers.

Pinout Designed for Easy Integration

With a 40-pin 0.5mm pitch FPC connector, the module provides:

• Dedicated power pins (VCI, TP_VCI)

• Reset and control signals

• I2C touch interface (though this model is without CTP)

• LED backlight drive (A/K pins)

Strict Power-On/Off Timing

The datasheet specifies a power-on sequence where VDD must stabilize before the display is enabled, and the backlight should be turned on only after 200ms. Adhering to these timings ensures long-term reliability and avoids display artifacts.

Optical Performance Meets Industrial Standards

With a typical contrast ratio of 900:1 and a brightness of 450 cd/m², the screen remains readable even under bright ambient light. The 70% NTSC color gamut ensures accurate color representation—key for diagnostic or status-indicating UIs.

Designed for Long-Term Use

The module has been tested under:

• High-temperature operation (70°C for 120 hours)

• Thermal cycling (-20°C to 70°C)

• Humidity exposure (40°C, 90% RH)

These tests ensure that the display will perform reliably in real-world conditions.

Conclusion

Whether you're building a industrial handheld terminal, a laboratory instrument, or a smart home controller, the SFTC400B-8951AN offers a robust, easy-to-integrate display solution. With clear documentation and reliable performance, Saef Technology Limited continues to support engineers with high-quality components for demanding applications.