产品名称:

WTC68K1R

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  • 应用秘籍
  • 产品概述
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  • 参考方案

Operating voltage: 3.3V

Output voltage range: GND

Sensing thickness (insulating medium): 0-10mm

Response time of effective touch: Less than 200ms

Operating temperature: -40°C—+85°C

Storage temperature: -50°C—+125°C


Be applicable to various kitchen apparatuses, audio and video devices, air conditioners, sanitary electrical apparatuses,lights and switches, security equipment, instruments, portable player, mobile phones, electronic toys and learning machines.


WTC68K1R Capacitive sensitive touch switch & roller encoder chip

WTC68K1R series touch sensing IC is an integrated circuit designed to achieve human touch interface.It can replace mechanical light touch and mechanical rotary encoder, to realize waterproof and dustproof, seal isolation,solid and beautiful operation interface. A WTC68K1R can achieve3 ~ 8 independent touch key and a touch roller encoder.It can provide user with a low-cost human-computer interaction interface. The operation and signal output of the touch roller coder is the same as the mechanical wheel coder. But there are no burrs for the output pulse of the mechanical code. The user does not have to handle the soft and hardware aiming at the burr, and only needs to adjust one capacitor Csel that can change the sensitivity of all channels, with high production efficiency.



 Definitions of WTC68K1R Pins:

 

WTC68K1R(8键+1编码器触摸感应滚轮IC )

                   Figure 1


Definitions of WTC62K1R Pins:

Pin No.Pin NameUsageFunction Description
1SW8|Touch key (induction disc) interface 6
2SW9|Touch key (induction disc) interface 7
3SW10|Roller induction disc unit interface
4SW11|Roller induction disc unit interface
5SW12|Roller induction disc unit interface
6SW13|Roller induction disc unit interface
7SW14|Roller induction disc unit interface
8SW15|Roller induction disc unit interface
9
CSEL|Roller induction disc unit interface
10GND |Roller induction disc unit interface
11CODER1OSensitivity adjustable capacitor interface
12CODER0OPower ground
13OUT A ORoller encoder pulse output A
14OUT BORoller encoder pulse output B
15OUT2O

The output of BCD code and the input of the fine tuning, and

the output of the roller encoder pulse is 0

16OUT3|/O

The output of BCD code and the input of the fine tuning, and

the output of the roller encoder pulse is 1

17
/RST|

The output of BCD code and the input of the fine tuning, and

the output of the roller encoder pulse is 2

18VCC|Touch key SW3 status output
19BLC   OChip reset pin
20BUZZOpositive power supply output
21SW0|

The Key state indicator: 1 indicates that there is no key

pressed in the key; 0 indicates that there is key pressed

22SW1|

The input signal of the sensitivity adjustment: setting 0

indicates that the user input the set sensitivity; when setting

1, it indicates that the module performs the test work

normally

23SW2|Touch key (induction disc) interface 0
24SW3|Touch key (induction disc) interface 1
25SW2|Touch key (induction disc) interface 2
26SW2|Touch key (induction disc) interface 3
27SW3|Touch key (induction disc) interface 4
28SW3|Touch key (induction disc) interface 5

 

 

Peripheral Circuit:

The peripheral circuit of WTC68K1R is very simple, and only needs a few resistors and capacitors. The key component is capacitor CSEL for adjusting the sensitivity and IK resistance group for measuring the matched impedance of circuit. CSEL should use 10%-precision polyester capacitor, capacitor made of NOP material or capacitor made of X7R material . 1K resistance group can provide you with the best and most stable measurement effect, and CSEL and matched resistance shall be placed as close as possible to IC at PCB layout. 

Figure 4 below shows the peripheral circuit diagram of WTC68K1R application


WTC68K1R                      Figure 4: WTC68K1R Application Schematic Diagram


Output Display:


The output of the touch key:

After the effective touch occurred is detected, WTC68K1R in 200ms will set the OUT FLAG leg in low indicator state.At this time, the external MCU of the customer can read the key value of the touch through the module BCD code data port. After the user's finger leaves the touch key, the OUT FLAG leg is automatically setting high.

WTC68K1R

                         Figure 2: Sequence diagram of the output of the key


Touch rotary encoder output:

The operation mode and output signal of the touch roller are consistent with the common mechanical roller encoder. But there is no the burr of mechanical output pulse. The user does not have to handle the soft and hardware aiming at the burr

WTC68K1R 

                                              Figure 3: Sequence diagram of touch roller output

 

The rotation of roller gives 30 pulses a week.

The phase difference between the two pulses is around 6ms


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