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HTTM is HelTec Touch Model shorthand;
□ → Number of keys: S- single key, D- double keys, T- triple keys, F- four keys;
◇ → Version attribute: C- conventional version, S- Special Edition (customized version);
△ → backlight colors: B- blue, R- red, G- green

Default models  ：HTDS-SCR

 HTTM series touch key module has the following features:
1. There is no mechanical parts, no wear, infinite life, reduce maintenance costs later;
2. The sensing part which can be placed in any insulating layer (usually a glass or plastic material) behind, it is easy to seal with the surrounding environment into the keyboard, in order to play the role of moisture and water;
3. The panel arbitrary pattern, button size, any shape design, characters, trademarks, and other transparent window with arbitrary, so that the overall stronger sense of product;
4. Compared with the physical buttons, touch buttons and more difficult to damage;
5. You can modify the resistance of the back, adjust the output signal of the latch output or keep the output level (see 3.3.2);
6. + 2.7V ~ + 6V wide input voltage range, + 3.3V signal output can be directly used to drive relays, optocouplers, LED lights and other original documents;
7. -30 ~ + 70 ℃ operating temperature range;
8. The touch sensitive, no lag, delay, flicker and other adverse reactions;
9. Built-in anti-jamming algorithm, with excellent anti-jamming performance.

Features：

Operating voltage: + 2.7 ~ 6V
l Working temperature: 30 ~ + 70 ℃
l OUT pin output voltage: + 3.3V ± 0.1V
l OUT pin Maximum Output Current: 500mA