Tty6858 single channel capacitive LED dimming touch control chip
Summary
6858 is a special single channel touch chip for LED lamps, which has the following features:
L brightness adjustment can choose stepless dimming or segmented dimming according to option.
L stable PWM frequency modulation output, frequency: 16KHz.
L the available media for touch surface are: glass, acrylic, plastic, ceramics, metal, etc.
L wide DC voltage application range: 2.4v-5.5v.
L provide low power consumption application mode, normal working current: 5.5V @ < 3mA, 3.3V @ < 1.5mA; sleep current: 5.5V @ < 20ua,
3.3V @ ＜ 10uA (related to external CS capacitance)
The application circuit is simple, the peripheral components are few, and the processing cost is effectively reduced.
L provide good resistance to external stray signal interference and mobile phone high-frequency signal interference, making touch reliability more stable.
L has a good waterproof performance, even if there is water over the touch surface will not affect the touch operation performance.
2. characteristics
There are four function options for the LED ﹣ O output corresponding to the TP touch input, which are determined by the opt1 and OPT2 pin options, as shown in the table below:
PS:0=GND; 1=VDD
Function description of mode OPT2 opt1
1 00 led three touch dimming function.
2001 with brightness memory, short touch LED light fade / fade switch control, long touch LED is none
Level dimming function.
3 1 0 without brightness memory, short touch LED light fade / fade switch control, long touch LED is
Stepless dimming function.
No brightness memory, short touch led on / off control, long touch led stepless
Dimming work