HOTHMI 1.3 inch Round TFT Display 240×240 UART

Product Introduction

HTM-H013A6-UART-A02 is a 1.3 Inch Round TFT Display designed for small embedded devices, human-machine interface terminals, and smart electronic products. It uses a round TFT LCD structure with a resolution of 240 × 240 pixels. The TFT active area has a diameter of approximately 32.40 mm, while the overall TFT outline is approximately 35.60 mm, making it suitable for electronic products that require a circular display interface and limited installation space. The display uses a Normally Black mode and provides a 60% NTSC color gamut, which can be used to display icons, numbers, status information, and simple graphical interfaces.

From a system integration perspective, this Round TFT Display integrates an EzUILet module and uses UART (TTL) as the communication interface. For embedded products controlled by an MCU, the display module can communicate with the main controller through UART for menu, parameter, status, and graphical UI control. The CN1 connector provides VDD, GND, RXD, and TXD, making it convenient for hardware engineers to connect the display module to the main control board.

The Round TFT Display operating temperature range is -20 to +70°C, while the storage temperature range is -30 to +80°C. These specifications allow the display to be used in conventional industrial electronics, instrumentation, and indoor smart terminals. The brightness is 300 cd/m², which can be considered during the initial display selection process for indoor instruments, controllers, smart terminals, and portable electronic devices.

For resource updates, this model uses a dedicated download PCB, with a resource storage capacity of 1024K-Byte. For embedded projects based on EzUILet, engineers need to consider the available resource capacity, number of UI pages, image resource size, and future update requirements during the development stage.

Product Specifications

Round TFT Display Product Highlights

• 1.3-Inch Round Display Structure：The product provides a circular active display area with a diameter of approximately 32.40 mm. This compact Round TFT Display is suitable for small instruments, rotary control interfaces, and electronic devices that use a circular display window.
• UART (TTL) Communication：This Round TFT Display uses UART (TTL) as the communication interface. The CN1 connector provides VDD, GND, RXD, and TXD, allowing the module to be connected to an MCU with a UART peripheral.
• EzUILet Module：The module is configured with EzUILet, which is suitable for embedded applications that require independent UI display control and resource management.
• Compact Mechanical Design：The maximum TFT + PCBA thickness is approximately 6.31 mm, while the PCB thickness is approximately 1.20 mm. This compact structure can be useful in small electronic products where internal installation space is limited.

Pin Description

Product Applications

Smart Instruments and Compact Equipment

A Round TFT Display is well suited to small measuring instruments, electronic meters, and testing equipment. Typical information displayed on the screen can include temperature, pressure, rotational speed, operating status, alarm information, and equipment parameters.

The circular active display area can also be matched with an instrument panel, rotary knob, or other round mechanical structures. This helps maintain a consistent relationship between the display window and the product housing.

Smart Home Controllers

In smart home equipment, the 1.3-inch round screen can display operating modes, device status, time, temperature, or graphical icons. Example applications include compact air-quality monitors, smart control knobs, and environmental sensor terminals.

The UART interface makes it convenient to connect the display module to an MCU for parameter updates and status information.

Wearable and Portable Electronic Devices

The 1.3-inch size is suitable for portable products where installation space is limited. The 240 × 240 resolution provides sufficient display capability for icons, numbers, status bars, and simple user interfaces.

When a product requires a circular display opening, this Round TFT Display can simplify mechanical integration compared with using a conventional rectangular display inside a circular enclosure.

Industrial Control and Status Indicators

The Round TFT Display can also be used in compact industrial controllers, equipment status terminals, and auxiliary display units. It can present operating status, alarm codes, counter values, and equipment parameters.

For industrial applications, engineers should first verify whether the actual operating temperature remains within the specified -20 to +70°C range. Brightness, vibration, humidity, and EMC requirements should also be evaluated according to the actual installation environment.

Engineering FAQ

Q1: How does the HTM-H013A6-UART-A02 communicate with an MCU through UART?

The HTM-H013A6-UART-A02 uses UART (TTL) and provides VDD, GND, RXD, and TXD through the CN1 connector. During hardware integration, the display module TXD should be connected to the MCU RXD, and the display module RXD should be connected to the MCU TXD. The two devices should share a common ground.

Since the actual interface is UART (TTL), engineers should also verify that the MCU UART electrical level is compatible with the display module before finalizing the hardware design.

Q2: How are UI resources updated on the HTM-H013A6-UART-A02, and how much storage is available?

This Round TFT Display is configured with EzUILet, a dedicated download PCB, and 1024K-Byte Resource Storage Capacity. During project development, engineers should plan the available 1024K-Byte storage according to the size of UI images, icons, fonts, and page resources.

The corresponding dedicated download PCB is used to update the display resources. Resource planning should also take future UI revisions and product updates into account.

From minor concept tweaks to full custom redesign & development, our engineering team offers end-to-end technical support. Feel free to contact us for custom display demands or technical issues during product selection.