产品名称:

WTC7514DSI(W)

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Operating voltage: 3.3V

Output voltage range: GND

Sensing thickness (insulating medium): 0-20mm

Response time of effective touch: Less than 140ms

Operating temperature: -40°C—+85°C

Storage temperature: -50°C—+125°C


It is applicable to various kinds of kitchen equipment, audio and video equipment, air conditioner, sanitary appliance, lamp switch, safety defense, instrument, portable player, electronic toys and learning machine and other products.


WTC7514DSI(W) 14 channel touch sensitive key chip specification (V1.2)

Specification  (V1.2) 

WTC7514DSI (W) is a kind of touch-sensitive key chip。The interior of this chip integrates the 14 channel capacitance measurement circuit, the calibration circuit and RISC processor of the independent design, provides the users with 14 man-machine interface scheme of capacitive touch sensitive key. Technical Parameters It meets the industrial application specification, can provide the users with more reliable performance.


 Definitions of WTC7514DSI(W) Pins and pin configuration diagram:

 

WTC7514DSI/WTC7514DSW(14键IIC/BCD输出触摸感应IC)

 Figure 1:WTC7514DSI(W) pin configuration diagram

The table 1 is the definitions of WTC7514DSI(W) 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

SW13 

|

Sense element of key 13

12

SW12 

|

Sense element of key 12

13

SDA/BCD0  

|

The data line of the Chip IIC interface. When BCD is output, the data is 0 bit (8421 code)

14

SDD0/BCD1 

O

The address set foot of the Chip IIC interface. When BCD is output, the data is the 1 bit (8421 code)

15

ACL/BCD2 

|

The clock input line of the chip IIC interface. When BCD is output, the data is 2 bit (8421 code)

16

ADD1/BCD3 

|

The address set foot of the chip IIC interface. When BCD is output, the data is 3 bit (8421 code).

17

IOS

|

The selected foot of output interface. When connecting GND, the IIC bus mode is making the data exchange externally. When connecting VCC, the BCD code (8421) mode to externally output key value when connecting VCC chip.

18

VCC

|

positive power supply output

19

OUT_FLAG 

O

The key state indicates that when the IOS is connected with GND, it outputs the high level pulse signal of 50mS when there is the key pressed, and when the IOS is connected with the VCC, it outputs the high level when there is the key pressed, and the low level is restored when the finger is left


20

TS 

|

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

21

SW11 

|

Sense element of key 11

22

SW10

|

Sense element of key 10

23

SW9

|

Sense element of key 9

24

SW8

|

Sense element of key 8

 

Working circuit diagram of WTC7514DSI(W)

 

The peripheral circuit of WTC7514DSI(W) is very simple, and only needs a few resistors and capacitors that it can work

 WTC7514DSI(W) Figure 2: Working circuit diagram of using IIC interface of WTC7514DSI (W)

WTC7514DSI(W)


 

 Figure 3: Working circuit diagram of using BCD code (8421) interface of WTC7514DSI (W)

 

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