产品名称：

WTC62K1R

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Operating voltage:2.4V

Working current: normal mode 1mA (3V power supply)

Sleep mode 10uA (3V power supply)

Output voltage range: GND

Sensing thickness (insulating medium): 0-10mm

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.

WTC62K1R Capacitive sensitive touch switch & roller encoder chipSpecification (V1. 2)

WTC62K1R series touch sensing IC is an integrated circuit designed to achieve human touch interface.It can replace mechanical light touch and mechanical rotary encoder, to realize waterproof and dustproof, seal isolation, solid and beautiful operation interface. A WTC62K1R can achieve 2 independent touch keys and a touch roller encoder. It can provide user with a low-cost human-computer interaction interface. The operation

and signal output of the touch roller coder is the same as the mechanical wheel coder. But there are no burrs for the output pulse of the mechanical code. The user does not have to handle the soft and hardware aiming at the burr, and only needs to adjust one capacitor Csel that can change the sensitivity of all channels, with high production efficiency. Through selecting the appropriate Csel capacitance value and properly adjusting the sensing disk area, it can make WTC62K1R to adapt the Insulation panels of different thickness of 0 — 10mm.

Definitions of WTC62K1R Pins：

Figure 1

Definitions of WTC62K1R Pins：

Pin No.	Pin Name	Usage	Function Description
1	SW5	\|	Roller induction disc unit interface
2	SW4	\|	Roller induction disc unit interface
3	SW3	\|	Roller induction disc unit interface
4	SW2	\|	Roller induction disc unit interface
5	SW1	\|	Roller induction disc unit interface
6	SW0	\|	Roller induction disc unit interface
7	CSEL	\|	Sensitivity adjustable capacitor interface
8	GND	\|	Power ground
9	ZB	O	Roller encoder pulse output B
10	ZA	O	Roller encoder pulse outputA
11	/RST	\|	Chip reset pin
12	VCC	\|	positive power supply output
13	K_OUT1	O	Touch key 1 output
14	K_OUT2	O	Touch key 2 output
15	KEY_IN1	\|	Touch key 1 (induction disc) input interface
16	KEY_IN2	\|	Touch key 2 (induction disc) input interface

Peripheral Circuit：

RP1 and RP2 are the match resistance group. Please try to place them close to the IC

WTC62K1R

Figure 4: WTC62K1R Application Schematic Diagram

The output of the touch key:

When the occurrence of effective touch on the sense element is detected, WTC62K1R will output the status of corresponding sense element channel within 100ms, so that it can be processed by user MCU, or directly drive the execution circuit to work The relationship between the output signal and the touch key input channel is shown below The signal output does not have the output jitter of the mechanical key. The user does not need to make mechanical key to jitter.

WTC62K1R

Figure 2: Sequence diagram of the output of the key

Touch rotary encoder output

WTC62K1R

Figure 3: Sequence diagram of touch roller output

The rotation of roller a week gives 20 pulses. One pulse is divided into four beats such as 01，10,11. and 10，00，01，11。

The phase difference between the two pulses is around 2.5ms.

WTC62K1R

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