If a human-machine interface requires extremely reliable, yet very compact, RGB SPST buttons, the TL3220 excels thanks to its highly robust mechanical design. It also has full RGB backlighting for maximum user-friendliness.

Adding backlighting to keys instantly improves a product's perceived value. It also helps reduce operator fatigue. In the case of a control panel, keys controlling systems exceeding limits could be backlit in a different color. With the TL3220, e-switch provides HMI designers with a one-stop shop solution.

5×5 Mm Small, Surface Mount

The TL3220 is extremely compact. Its outline is only 4.9×4.9 mm, with a low-profile height of only 2 mm. When combined with the surface-mount installation flanges, the result is an extremely compact touch button that can be placed in the most space-constrained of front panels.

The activation distance is just 0.2 mm, with a pushing force of 160 +/- 50 gf, ensuring secure, yet comfortable, activation of the knob.

The electrical contacts are rated for 100,000 touch cycles and can handle 12 V DC and 50 mA. All of this is achieved across an operating temperature range from -40 to +85°C; the buttons are environmentally proof to IP5X.

Integrated RGB LED for Switch Backlighting

One outstanding aspect of the TL3220 family is the RGB LED on the top of the key. The diode pinout is as shown.

Thanks to the three exposed cathodes, driving the LED can be handled with a variety of LED driver ICs, which are affordable and easy to deploy. Furthermore, advanced algorithms can be used to create light effects on the keypad.

The TL3220 data sheet specifies a reflow soldering profile. The TL3220 RGB switches are completely reflow oven-proof. They can be deployed on front panels during the standard pick-and-place process used to populate other components.

A Variety of Options Are Available

e-switch provides a variety of customization options. The most commonly used version is SKU TL3220AF160RGBR, which has all the properties described above. Should the circuit designer need to customize the component, this is also possible.

Conclusion

If a front panel design requires an attractive, yet compact and sturdy, RGB LED-backlit SPST button, the e-switch TL3220 is an excellent choice. Thanks to its reliable construction and the ability to withstand 100,000 cycles, the longevity of the resulting device is secured. The exposed RGB LED, then, permits designers to create advanced illumination scenarios. In short, a component adding luster to front panels.