Case Details
As a professional touchscreen manufacturer, we are committed to meeting complex application requirements through technological innovation and flexible solutions. Recently, in order to meet the specific interface matching requirements of customers in the electronic scale industry, we skillfully used the 11.6-inch off-the-shelf PCAP touch screen with the exclusive adapter board, successfully overcoming the problem that direct communication could not be achieved due to inconsistent pin definitions, and ensuring the rapid response of the equipment in commercial retail and weighing environments.
Project Background
In view of the fact that the customer's electronic scale motherboard has been finalized and the circuit cannot be changed, the customer plans to purchase our 11.6-inch (model: STC-11697, equipped with EETI ILI2511 chip scheme) off-the-shelf PCAP touch screen. However, the standard capacitive screen of our company is 6pin I2C interface, while the I2C interface of the customer's existing motherboard is 7pin. Due to the inconsistency between the physical interface and the pin definition, the direct connection cannot work normally. In order to meet this special situation, and on the premise that customers don't consider customization and pursue high efficiency and low cost, our professional engineering team conducted in-depth analysis and put forward an efficient conversion scheme for the adapter board.
Key Solutions
Aiming at the pin difference between 6pin and 7pin I2C interfaces, the engineering team quickly designed a special interface adapter board, which accurately rearranged the physical paths of power supply (VDD/VCC), GND), clock wire (SCL), data wire (SDA), interrupt signal (INT) and reset signal (RST) to realize signal bridging.
Combined with the electrical characteristics of ILI2511 chip on the FPC, our engineering team installed a matching pull-up resistor and pre-filter circuit on the external adapter board. This design effectively counteracts the parasitic capacitance caused by interface conversion, and blocks the power supply and RF interference in the electronic scale in advance on the physical link, ensuring the complete I2C communication waveform and stable transmission.
This scheme does not require the customer to change the motherboard, nor does it require our company to re-open the mold or change the software and hardware of the touch screen. Connect the existing screen and motherboard directly through the adapter board, and solve the problem of communication failure caused by incompatible interfaces with high service efficiency and response speed.
Overall Impact
After strict wiring and on-site simulation test of electronic scales, we successfully promoted the formal procurement of the project. The 11.6-inch touch screen is perfectly compatible with the customer's motherboard, with sensitive touch response, accurate click and stable operation, which meets the needs of high-frequency and high-intensity touch use in commercial retail. Our scheme has reached the final expectation of customers with the lowest time and capital cost. Customers are highly satisfied with our team's efficient response and expertise.
Conclusion
Through professional hardware design and technical optimization, we successfully overcome the problem of mismatch between the interface pins of the motherboard and the touch screen, showing the strong technical adaptability of our company team and the timeliness of the solution. In the future, we will continue to innovate and provide high-quality touch screen solutions in various industries to achieve mutual benefit and win-win between manufacturers and customers.
