产品名称:

WTC6312ML

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

Operating voltage: 2.2V

Output voltage range: GND

Sensing thickness (insulating medium): 0-20mm

Response time of effective touch: Less than 150ms

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.


WTC6312ML Inductive touch key chip of twelve-channel electric capacitance

Specification  (V1.4)

WTC6312ML 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.The very low standby power consumption of it can meet the requirements of reliability and low power consumption of the protection equipment of the safe box password lock and other battery power supply. A WTC6312ML can achieve 4 to 12 independent keys. The user can use it flexibly according to the needs.


Definitions of WTC6312ML Pins: 

引脚图7.jpg

Figure 1:WTC6312ML pin configuration diagram

 

The definitions of WTC6312ML pins:

Pin No.

Pin Name

Usage

Function Description

1

SW7

|

Sense element of key 7

2

SW6

|

Sense element of key 6

3

SW5

|

Sense element of key 5

4

SW4

|

Sense element of key 4

5

SW3

|

Sense element of key 3

6

SW2

|

Sense element of key 2

7

SW1

|

Sense element of key 1

8

SW0

|

Sense element of key 0

9

CSEL

|

Capacitor interface for adjusting the sensitivity

10

GND 

|

Power ground

11

BLC 

O

The backlight control can also be used to indicate the working state of the chip. When it is low electrical level, it indicates that the chip is in the normal working condition, and when it is high electrical level, it indicates that the chip has entered into the dormant state. At this time, the working current of the chip can be reduced to below 10uA

12

WAKE 

I

The external connection of the chip awakens the pin. After the chip enters the dormancy and when the foot has a change from high electrical level to low electrical level, it can

immediately awaken the chip.

(The interior of WAKE foot has about 30K of the upper pulling resistance).

13

SDI

|

Data input line of the chip SPI interface

14

SDO 

O

The data output line of the chip SPI interface

15

SCK

|

The clock input line of the chip SPI interface

16

SCS 

|

The chip selection enabled line of the Chip SPI interface

17

/RST

|

Chip reset pin

18

VCC

|

positive power supply output

19

OUT_FLAG   

O

Key status indicator: when there is key pressed, it is the low level

signal. And when all the keys are flicked, it restores to be high level

20

TS

I

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

21

SW8

|

Sense element of key 8

22

SW9

|

Sense element of key 9

23

SW10

|

Sense element of key 10

24

SW11

|

Sense element of key 11


The SPI interface of WTC6312ML:

SPI sequence diagram

The SPI time sequence diagram is shown in figure 4:

WTC6312ML

                 Figure 4: Sequence diagram of the SPI interface of WTC6312ML

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

The peripheral circuit of WTC6312ML 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 WTC6312ML of WTC6312ML work under the multicity combination of 12 keys(SHIFT) mode

WTC6312ML





 



 

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