HOTHMI 1.54 inch Square TFT Screen 240X240 ST7789

Product Introduction

TFT-H015A2QQIST7N10 is a 1.54-inch Square TFT Screen designed for embedded devices, portable electronic products, and compact human-machine interfaces. The product features a 240 × 240 RGB resolution and a 27.72 × 27.72 mm active display area. Its square display format is suitable for compact electronic devices with specific requirements for display shape, device size, and PCB space.

This Square TFT Screen uses TFT LCD technology with a Normally Black display mode and supports 262K colors. It integrates an ST7789 TFT Driver IC, and the host communicates with the display module through a 4-Line Serial Interface. For devices using an MCU, MPU, or other embedded controller, the serial interface can be used for display initialization, image data writing, and display control.

In terms of display performance, this Square TFT Screen provides a typical brightness of 700 cd/m² and a typical contrast ratio of 900:1. The horizontal and vertical viewing angles are both 80°, supporting information readability from different viewing directions.

For temperature performance, this Square TFT Screen operates from -20°C to +70°C and has a storage temperature range of -30°C to +80°C. The product has also completed reliability tests including high-temperature operation, low-temperature operation, high-temperature storage, low-temperature storage, and high-temperature high-humidity operation.

Product Specifications

Square TFT Screen Product Highlights

• 1.54-Inch Square Display Structure：The 240 × 240 pixel resolution and 27.72 × 27.72 mm display area form a standard square display area, making this Square TFT Screen suitable for square control interfaces and compact electronic devices.
• ST7789 Driver Solution：The display uses an ST7789 Driver IC and supports a 4-Line Serial Interface. Engineers can control the display through SPI-type serial communication.
• 700 cd/m² Display Brightness：The standard non-touch version provides a typical brightness of 700 cd/m², meeting the display requirements of most indoor applications and some applications with higher ambient light levels.
• Full-View Design：The specification defines 80° viewing angles in both horizontal and vertical directions. The Full View structure helps users read display information from different viewing directions.
• Wide-Temperature Operation：The operating temperature range is -20°C to +70°C, making the Square TFT Screen suitable for industrial controls, instrumentation, and other equipment exposed to certain temperature variations.
• Integrated Display RAM：The ST7789 solution integrates graphic RAM for display data storage and can reduce some of the display buffer requirements on the host controller. The specification lists the display RAM as 240 × 320 × 18-bit.

Pin Description

Product Applications

The key advantages of this Square TFT Screen are its compact size, square display area, serial interface, and relatively high brightness. It is suitable for the following applications:

Compact Handheld Instruments

In portable testers, measuring instruments, or handheld control devices, PCB space is often limited. With a TFT dimension of 31.52 × 33.72 × 1.95 mm, this Square TFT Screen can be used to display measurement values, device status, parameter settings, and simple graphical interfaces. The 240 × 240 resolution provides sufficient space for basic text, numerical data, and icons on compact devices.

Embedded Control Panels

For embedded equipment that requires a display within a small panel, this Square TFT Screen can display operating status, menus, parameters, and operation prompts. The product uses a 4-Line Serial Interface and an ST7789 Driver IC, making it suitable for direct display control by an MCU. During development, engineers can design the communication and initialization procedures according to the interface resources of the host controller.

Smart Instruments and Status Display Devices

In compact instruments or status monitoring devices, the display mainly provides data and status information, such as numerical values, operating modes, alarm prompts, and equipment status. This product uses a Normally Black TFT, with a typical brightness of approximately 700 cd/m² and a typical contrast ratio of 900. The horizontal and vertical viewing angles are approximately 80°, supporting clear information display in embedded instrumentation applications.

Compact HMI Devices

For equipment with limited enclosure space that still requires a graphical human-machine interface, the 1.54-inch Square TFT Screen can serve as a compact display unit. The standard product does not include a touch panel, allowing engineers to use buttons, knobs, or other input methods according to the requirements of the complete device. The -20°C to +70°C operating temperature range also makes it suitable for embedded equipment exposed to certain temperature variations.

For the applications above, final product selection should be confirmed based on the host interface, power supply conditions, mechanical installation requirements, display brightness, operating temperature, and certification requirements of the complete device.

What Should Engineers Consider When Selecting a Square TFT Screen?

When selecting a Square TFT Screen, purchasing teams and engineers should focus on six key parameters.

First, confirm whether the 240 × 240 resolution and 27.72 × 27.72 mm active area meet the UI layout requirements. Second, verify whether the host controller can support the 4-Line Serial Interface and confirm the applicable I/O voltage range. Third, check the available installation space inside the device, as the TFT dimensions are approximately 31.52 × 33.72 × 1.95 mm. Fourth, evaluate whether the 700 cd/m² brightness is sufficient for the actual ambient lighting conditions. Fifth, confirm whether the -20°C to +70°C operating temperature range meets the actual temperature requirements of the equipment. Finally, if touch interaction is required, confirm in advance whether the standard non-touch version needs to be developed with a TP solution.

Technical FAQ

Q1: How can the TFT-H015A2QQIST7N10 Square TFT Screen be connected to an MCU?

A: This Square TFT Screen uses a 4-Line Serial Interface. The interface definition in the specification includes control signals such as CS, RESX, SCK, SDA, and D/CX. SCK is the serial interface clock, SDA is the SPI interface data input/output, D/CX is used to distinguish display data from commands, and CS is an active-low chip select signal. During engineering development, the host MCU should configure the communication timing according to its SPI resources and correctly handle the reset and chip-select signals. The product supports RGB444, RGB565, and RGB666 display data formats.

Q2: What are the power supply parameters of this Square TFT Screen, and what should engineers consider when designing the power system?

A: According to the detailed electrical parameters in the specification, the TFT power supply VCI has an operating range of 2.5–3.3V, with a typical value of 2.8V. IOVCC has an operating range of 1.7–3.3V, with a typical value of 1.8V. The recommended power supply relationship is 1.7V ≤ IOVCC ≤ VCI ≤ 3.3V. During engineering design, the actual supply voltage should remain within the specified operating range, and the absolute maximum ratings should not be exceeded to reduce the risk of abnormal LCD module operation.