Products are becoming very intelligent and connected with each other. Devices such as speakers, TVs, refrigerators, set-top boxes and smoke detectors are no longer objects that just sit there – users can control them remotely or through voice wakeup. Devices are much smarter than before, which means they will also require an improved human-machine interface.
A light-emitting diode (LED) indicator like an LED ring, LED matrix or red-green-blue (RGB) LED lighting interacts with users by changing patterns, such as chasing or blinking. Figure 1 shows some pattern examples.
Figure 1: Examples of LEDs used for a human machine interface
To have a very friendly human-machine interface, these elements are important:
While at first this list may seem daunting, all you need to generate great LED effects is a smart LED driver with these key features:
TI’s LP50xx family of multichannel, RGB LED drivers, shown in Figure 2, is a good fit with this feature list.
Figure 2: LP50xx family functional block
The devices integrate a 12-bit PWM generator that operates above a human-audible frequency, at 29 kHz per channel, enabling smooth, vivid color with zero audible noise. 18-, 24-, 30- and 36-channel options provide independent color mixing and brightness control. With an integrated power-saving mode, these LED drivers dramatically reduce power consumption to improve total system efficiency in standby mode.
The LP50xx family enables you to achieve seamless, smooth animation in applications that use a human-machine interface, such as portable electronics, building automation and appliances.
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