产品名称:

WTC1008BSI

  • 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. It especially applies to the displayer, TV and other electronic devices that use A/D key input


WTC1008BSI 8-Channel Capacitive-Sensing Touch Button Chip

Specification  (V1.5)

WTC1008BSI 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 WTC1008BSI can achieve 3 to 8 independent keys. The user can use it flexibly according to the needs. It especially can be used to replace the display, TV set and other mechanical keys of wide applications of A/D key input mode.


Pin Configuration:

 

引脚图14.jpg

Figure 1: Pin Diagram Of WTC1008BSI


Definitions of Pins:

Pin No.Pin NameUsageFunction Description
1SW7|Interface of touch key 7 (sense element 7)
2SW6|Interface of touch key 6 (sense element 6)
3SW5|Interface of touch key 5 (sense element 5)
4SW4|Interface of touch key 4 (sense element 4)
5SW3|Interface of touch key 3 (sense element 3)
6SW2|Interface of touch key 2 (sense element 2)
7SW1|Interface of touch key 1 (sense element 1
8SW0|Interface of touch key 0 (sense element 0)
9
CSEL|Capacitor interface for adjusting the sensitivity
10GND|Power ground
11TS |Internal test foot, usually fixed with VCC
12HLS|

The selection of the initial electrical level on the state output: the initial state of connecting VCC output is high impedance, and the initial of connecting GND output is low

13OUT0OSW0 status output
14OUT1OSW1 status output
15OUT2OSW2 status output
16OUT3OSW3 status output
17
/RST|IC reset pin
18VCC| Power input
19OUT4  OSW4 status output
20OUT5OSW5 status output
21OUT6OSW6 status output
22OUT7OSW7 status output
23BUZZOBuzzer control pin
24BLCOBacklight LED control pin 


Output Display:

When the effective touch occurred on the sensor disc is detected, the WTC1008BSI outputs the state of the sensing disk channel being touched in in 100ms, so that the user MCU can process it or directly drive to perform the circuit work. WTC1008BSI has two types of output. Select by HLS food of 1C connecting GND of VCC.

 The output indication when HLS is connecting VCC.

WTC1008BSI

                 Figure 2: The sequence diagram when HLS is connecting VCC

The output indication when HLS is connecting GND

WTC1008BSI

               Figure 2:The sequence diagram when HLS is connecting GND

 

Peripheral Circuit and Precautions:

The peripheral circuit of WTC1008BSI 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 or capacitor made of X7R material . 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 4 is the application circuit diagram of WTC1008BSI working under the 8 key mode



WTC1008BSI

                   Figure 4: WTC1008BSI Application Schematic Diagram

 

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