产品名称:

WTC6316BSI

  • 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,Maximum: 50mm

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.


WTC6316BSI Inductive touch key chip of sixteen-channel electric capacitance

Fast Browsing (1.5) 

WTC6316BSI series touch sensing IC is an integrated circuit designed to achieve human touch interface. It can replace the mechanical light touch key to realize waterproof and dustproof, seal isolation, with strong and artistic operation interface. A WTC6316BSI can achieve 4 to 16 independent keys. The user can use it flexibly according to the needs.


Definitions of WTC6316BSI Pins:

引脚图8.jpg

 Figure 1:WTC6316BSI pin configuration diagram

The definitions of WTC6316BSI pins:

Pin No

Pin Name

Usage

Function Description

1

SW9

|

Sense element of key 9

2

SW8

|

Sense element of key 8

3

SW7

|

Sense element of key 7

4

SW6

|

Sense element of key 6

5

SW5

|

Sense element of key 5

6

SW4

|

Sense element of key 4

7

SW3

|

Sense element of key 3

8

SW2

|

Sense element of key 2

9

SW1

|

Sense element of key 1

10

SW0

|

Sense element of key 0

11

CSEL

|

Capacitor interface for adjusting the sensitivity

12

GND

|

Power ground

13

CODER1 

|

When the selection foot of the work mode: connects GND, the single key working mode is selected, and when it connects to VCC, the multi-key combination mode is selected.

14

S1

|

The S1 must be connected to VCC usufully for the internal test foot

15

SDI 

|

Data input line of the chip SPI interface

16

SDO 

O

The data output line of the chip SPI interface

17

SCK

|

The clock input line of the chip SPI interfac

18

SCS 

|

The chip selection enabled line of the Chip SPI interface

19

/RST  

|

Chip reset pin

20

VCC

|

positive power supply output

21

OUT_FLAG

O

The key state indicator: when there is key pressed, it outputs the low level signal of 50mS

22

TS

|

The TS must be connected to VCC usufully for the internal test foot

23

SW15

|

Sense element of key 15

24

SW14

|

Sense element of key 14

25

SW13

|

Sense element of key 13

26

SW12

|

Sense element of key 12

27

SW11

|

Sense element of key 11

28

SW10

|

Sense element of key 10

 Output Display:

When the effective touch on the sense element occurred is detected, the foot of OUT_ FLAG of WTC6316BSI within 150ms will output the level signal of 50ms. The customer can use this signal to realize the key awakening function, and at the same time, can externally connect a triode to drive a DC buzzer to realize the voice indication of the touch key . As shown in figure 2.

WTC6316BSI

                          Figure 2: The signal driving buzzer of OUT_FLAG

OUT_FALG is an indication pulse that is output after the touch key is touched, but it does not indicate the touch time of the key. The key value of the touch key will kept on the finger all the time until the finger is left, and can it be continually read and judged in the program.

The SPI interface of WTC6316BSI

 SPI sequence diagram

The SPI time sequence diagram is shown in figure 3:

WTC6316BSI

             Figure 3: Sequence diagram of the SPI interface of WTC6316BSI

Multi-key combination (SHIFT) mode:

The peripheral circuit of the multi-key combination (SHIFT) mode and the matters needing attention

The peripheral circuit of WTC6316BSI 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 circuit diagram of WTC6316BSI of WTC6316BSI work under the multicity combination of 16 keys(SHIFT) mode

WTC6316BSI





 

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