产品名称:

WTC6601RSI

  • 产品参数
  • 应用秘籍
  • 产品概述
  • 工作电路
  • 参考方案

Operating voltage: 3.3V

Output voltage range: GND

Sensing thickness (insulating medium): 0-20mm

Response time of effective touch: Less than 100ms

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.


WTC6601RSI Inductive touch Switch chip of six-channel electric capacitance

Specification  (V1.3)

WTC6601RSI 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 WTC6601RSI can achieve 3-4 independent touch keys and a touch roller encoder. It can provide user with a low-cost human-computer interaction interface. Touch roller, slide bar can be very sensitive to detect the finger on the sliding direction and sliding distance of the roller or slide bar, respectively and continuously output multi-pulse signals from the UP output foot or DOWN output foot. The longer the fingers sliding distance, the more the number of pulses output from UP and Down. The main controller can follow on the basis of the pulse signal to control the increase or decrease of physical quantity, make the operation roller and slide bar reaching the effect of the operating multi-turn potentiometer and sliding potentiometer


Definitions of Product Pins:

Pin arrangement

WTC6601RSI(6键+1滚轮/滑条触摸感应滚轮IC)

          Figure 1

 

The definitions of WTC6601RSI pins:


Pin No.Pin NameUsageFunction Description
1BLCOBacklight LED control pin
2BUZZOBuzzer control pin
3SW8|Roller induction disc unit interface
4SW9|Roller induction disc unit interface
5SW10|Roller induction disc unit interface
6SW11|Roller induction disc unit interface
7SW12|Roller induction disc unit interface
8SW13|Roller induction disc unit interface
9
SW14|Roller induction disc unit interface
10SW15|Roller induction disc unit interface
11CSEL|Capacitor interface for adjusting the sensitivity
12GND|Power ground
15UP OThe output foot of the forward siding pulse
16DOWN OThe output foot of the reverse sliding pulse
17OUT2OTouch key SW2 output
18OUT3/|OTouch key SW3 output
17
OUT2OTouch key SW2 status output
18OUT3|/O Touch key SW3 status output
21/RST  |Chip reset pin
22VCC|positive power supply output
23SW0|Touch key (induction disc) interface 0
24SW1|Touch key (induction disc) interface 1
25SW2|Touch key (induction disc) interface 2
26SW3|Touch key (induction disc) interface 3
27SW4|Touch key (induction disc) interface 4
28SW5|Touch key (induction disc) interface 5


Output Display:

The output of the touch key

When there is no any key pressed in WTC6601RSI, the four key output end OUT0-OUT5 are all high impedance state. When the valid touch on the keys induction disk occurred is detected, WTC6601RSI responds within 100 ms, the corresponding key output port outputs the low level, until the finger leaves the induction disk, and the output port can restore to the high impedance state. Taking SW0 channel as an example, the sequence diagram of the output signal is as follows:

WTC6601RSI

                                         Figure 2: Sequence diagram of the output of the key

The signal output does not have the output jitter of mechanical key. The user does not need to make shaking process of mechanical key.

 Touch slide bar roller output:

Touch roller, slide bar can very sensitively to detect the sliding direction and sliding distance of the finger on the roller or slide bar, continually outputs the pulse signal respectively from the UP output foot or DOWN output foot. The longer the fingers sliding distance is, the more number of the pulse output by UP or DOWN is.

WTC6601RSI

             Figure 3: The output sequence diagram of the touch roller

Application circuit and sensitivity setting:

he peripheral circuit and the matters needing attention

The peripheral circuit of WTC6601RSI 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 paster or capacitor made of X7R material paster. 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 5 is the application peripheral circuit diagram

WTC6601RSI

                                          Figure 4: Application schematic diagram

 

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