Abstract : This paper introduces a Cypress-based EZ-Color controller and a codeless embedded design software PSoC express to achieve a high-brightness LED lighting color mixing scheme. Compared with the previous solutions, the solution has the advantages of high integration, low cost, good flexibility and unprecedented ease of use, and can effectively solve the problem of low frequency flicker and electromagnetic interference.
Key words : EZ-Color controller; color mixing; PrISM technology; PSoC express
introduction
With the ever-changing pace of the semiconductor lighting industry, high-bright LEDs with long life, low energy consumption, flexible application, environmental protection and other advantages are gestating a new industrial revolution - the lighting revolution, making our lives and work The environment is glamorous and colorful. However, since the LED itself is a characteristic of a semiconductor device, LED lighting design faces two major challenges - LEDs of the same color have various types of specifications and the performance of the LED is lowered with temperature. This requires lighting engineers to make LED model specifications and temperature compensation considerations when designing LED lighting color mixing. LED model specifications and temperature compensation algorithm design are not only complex, but also require lighting engineers to have a more professional knowledge of color theory. This has led many lighting design engineers to avoid complicated LED model specification compensation algorithm design by designing and producing LEDs with specified specifications. But this will bring an increase in cost to the entire system, because LED suppliers usually charge an additional 10% of the designation fee. In order to help the majority of lighting design engineers solve the challenge of LED color mixing design, this paper introduces a Cypress-based EZ-Color controller that does not require the specification of LED models, and can quickly and easily complete a high-performance LED lighting with excellent performance. Color mixing design.
EZ-Color controller
The EZ-Color controller is a programmable system-on-chip chip from Cypress for high-brightness LED lighting color mixing applications. It is mainly composed of 8-bit microprocessor, programmable analog module and digital module, plus hardware multiply accumulator, I2C, Flash, SRAM and other peripheral peripheral modules, as shown in Figure 1.
Figure 1 Functional block diagram of the EZ-Color controller
Therefore, in addition to the calculation control function of the general LED color mixing system, the EZ-Color controller can flexibly realize the required analog and digital peripheral functions according to the specific requirements of the color mixing system through programmable analog and digital modules. For example, the EZ-Color controller CY8CLED16 with 16 programmable digital modules can be integrated to realize the LED lighting color mixing system of up to 16 LED control channels. It can also be designed as a 32-bit resolution 4-channel LED control channel. Color mixing system. In order to facilitate the user to achieve high-brightness LED color mixing design simply and quickly, Cypress built a three-color LED color mixing module based on EZ-Color controller and codeless design software. This color mixing module has been configured with PSoC internal registers, programmable module internal wiring, LED model specifications and temperature compensation algorithm software. When users need to design the lighting color mixing system, just select the three-color LED color mixing driver as the windows operation and drag and drop it into the PSoC express design area. All the lighting color mixing software will be automatically generated.