产品名称：

WTC1008BSI

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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 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:

Figure 1: Pin Diagram Of WTC1008BSI

Definitions of Pins:

Pin No.	Pin Name	Usage	Function Description
1	SW7	\|	Interface of touch key 7 (sense element 7)
2	SW6	\|	Interface of touch key 6 (sense element 6)
3	SW5	\|	Interface of touch key 5 (sense element 5)
4	SW4	\|	Interface of touch key 4 (sense element 4)
5	SW3	\|	Interface of touch key 3 (sense element 3)
6	SW2	\|	Interface of touch key 2 (sense element 2)
7	SW1	\|	Interface of touch key 1 (sense element 1
8	SW0	\|	Interface of touch key 0 (sense element 0)
9	CSEL	\|	Capacitor interface for adjusting the sensitivity
10	GND	\|	Power ground
11	TS	\|	Internal test foot, usually fixed with VCC
12	HLS	\|	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
13	OUT0	O	SW0 status output
14	OUT1	O	SW1 status output
15	OUT2	O	SW2 status output
16	OUT3	O	SW3 status output
17	/RST	\|	IC reset pin
18	VCC	\|	Power input
19	OUT4	O	SW4 status output
20	OUT5	O	SW5 status output
21	OUT6	O	SW6 status output
22	OUT7	O	SW7 status output
23	BUZZ	O	Buzzer control pin
24	BLC	O	Backlight 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.

Figure 2: The sequence diagram when HLS is connecting VCC

The output indication when HLS is connecting GND

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

Figure 4: WTC1008BSI Application Schematic Diagram

WTC1008BSI

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