产品名称：

WTC7508DSI

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参考方案

It meets the industrial application specification, can provide the users with more reliable performance.

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..

WTC7508DSI 14 channel touch sensitive key chip

Specification （V1.1）

WTC7508DSI is a kind of touch-sensitive key chip。The interior of this chip integrates the 8 channel capacitance measurement circuit, the calibration circuit and RISC processor of the independent design, provides the users with 8 man-machine interface scheme of capacitive touch sensitive key. Technical

Definitions of WTC7508DSI Pins and pin configuration diagram:

引脚图13.jpg

Figure 1：WTC7508DSI pin configuration diagram

The table 1 is the definitions of WTC7508DSI pins:

Pin No.	Pin Name	Usage	Function Description
1	SW5	\|	Sense element of key 5
2	SW4	\|	Sense element of key 4
3	SW3	\|	Sense element of key 3
4	SW2	\|	Sense element of key 2
5	SW1	\|	Sense element of key 1
6	SW0	\|	Sense element of key 0
7	CSEL	\|	Capacitor interface for adjusting the sensitivity
8	GND	\|	Power ground
9	SDA/BCD0	\|	The data line of the Chip IIC interface. When BCD is o tput, the data is 1 bit (8421 code)
10	SCL/BCD1	\|	The clock input line of the chip IIC interface. When BCD is output, the data is 2 bit (8421 code)
11	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.
12	VCC	\|	positive power supply output
13	ADD0/BCD2	\|	The address set foot of the chip IIC interface. When BCD is output, the data is 3 bit (8421 code).
14	ADD1/BCD3	\|	The address set foot of the chip IIC interface. When BCD is output, the data is 4 bit (8421 code).
15	SW7	\|	Sense element of key 7
16	SW6	\|	Sense element of key 6

Working circuit diagram of WTC7508DSI:

WTC7508DSI （8键可选IIC/BCD输出触摸感应IC )

Figure 2: Working circuit diagram of using IIC interface of WTC7508DSI

ADD1,ADD0 设定 IC 地址为 70H

Figure 3: Working circuit diagram of using BCD code (8421) interface of WTC7508DSI

Data when BCD code is output:

When there is no finger touch the induction disk chip, the data output by BCD3~BCD0 pin is 0(8421 code). When the effective touch on induction disk occurred is detected, in 150ms, through BCD3~BCD0 pin, WTC7508DSI outputs the BCD code of the corresponding plate channel, so that to deal with MUC when finger is left the induction disk, theBCD3~BCD0 pin recovers to be 0

The following figure is a sequence diagram of BCD data output

WTC7508DSI （8键可选IIC/BCD输出触摸感应IC )

WTC7508DSI

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