产品名称:

WTC6401RSI

  • 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.


WTC6401RSI Inductive touch Switch chip of six-channel electric capacitance

Specification  (V1.5)

WTC6401RSI 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 WTC6401RSI can achieve 2-4 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:

WTC6401RSI

         Figure 1

The definitions of WTC6401RSI pins

Pin No.

Pin Name

Usage

Function Description

1

SW8

|

Roller induction disc unit interface

2

SW9

|

Roller induction disc unit interface

3

SW10

|

Roller induction disc unit interface

4

SW11

|

Roller induction disc unit interface

5

SW12

|

Roller induction disc unit interface

6

SW13

|

Roller induction disc unit interface

7

SW14

|

Roller induction disc unit interface

8

SW15

|

Roller induction disc unit interface

9

CSEL

|

Capacitor interface for adjusting the sensitivity

10

GND

|

Power ground

11

UP

O

Roller, slide bar UP pulse output foot

12

DOWN

O

Roller, slide bar DOWN pulse output foot

13

OUT0

O

Touch key SW0 output

14

OUT1

O

Touch key SW1 output

15

OUT2

O

Touch key SW2 output

16

OUT3

|/O 

Touch key SW3 output

17

/RST

|

Chip reset pin

18

VCC

positive power supply output

19

BLC

O

Backlight LED control pin

20

BUZZ

O

Buzzer control pin

21

SW0 

Touch key (induction disc) interface 0

22

SW1

Touch key (induction disc) interface 1

23

SW2

|

Touch key (induction disc) interface 2

23

SW3

|

Touch key (induction disc) interface 3

 Output Display: 

 The output of the touch key

When there is no any key pressed in WTC6401RSI, the four key output end OUT0-OUT3 are all high impedance state. When the valid touch on the keys induction disk occurred is detected, WTC6401RSI 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:

WTC6401RSI

                                        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.

WTC6401RSI

             Figure 3: The output sequence diagram of the touch roller

Application circuit and sensitivity setting:

 The peripheral circuit and the matters needing attention

he peripheral circuit of WTC6401RSI 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

WTC6401RSI




 

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