产品名称：

WTC401SPI

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产品参数
应用秘籍
产品概述
工作电路
参考方案

按键数量： 1-4个按键，一个机械按键
滑条/滚轮数： 1个编码器(滑条/滚轮)
按键反应模式： 单键反应模式
技术机理： 电容数字转换技术
按键感应盘大小： 最小3mm×3mm ,最大30mm×30mm , 根据实际需要和面板厚度而定
按键感应盘间距： 最小间距2mm,根据实际需要而定
按键感应盘形状： 任意形状多边形,圆形或椭圆形,中间可留孔或镂空
按键感应盘材料： PCB铜箔,金属片,平顶圆柱弹簧,导电橡胶,导电油墨,导电玻璃的ITO层等
对PCB的要求： 双面PCB
面板材质： 绝缘材料,如有机玻璃,普通玻璃,钢化玻璃,塑胶,木材,纸张,陶瓷,石材等
面板厚度： 0~5mm
按键灵敏度调节方式： 改变基准电容CSEL 的值可对按键的灵敏度进行调节
有效触摸反应时间： 小于100ms
防水性能： 对面板撒水,喷水按键不发生误动 ,面板漫水,积水时触摸按键无异常反映
抗射频干扰性能： 能够有效消除GSM 手机贴近面板拨打或接听电话，大功率对讲机贴近面板进行对讲操作产生的射频干扰
工作电压范围： 2.4V-5.5V
工作温度范围： －40℃－+85℃
数据传输接口： 按键输出为SPI接口，滑条/滚轮输出为SPI数据
储存温度范围： －50℃－+125℃
芯片封装形式： SSOP24(150MIL)
典型应用： 各种触摸感应遥控器，例如LED调光混色遥控器等需要连续调节物理量的应用场合

1、LED调光（亮度，混色，色温）

2、LED照明遥控器

3、热水器

4、音响

5、抽油烟机电机调速

WTC401SPI 4 keys + 1 roller slider capacitive touch sensing chip

Specification (V1. 1)

WTC401SPI has 4 keys and 1 roller/slider. Through the output key value of the SPI interface and the roller of finger touch, position data is 0 ~ 7FH, total 128 pieces. SSOP24A encapsulation.

Definitions of WTC401SPI Pins:

Figure 2：WTC401SPI Pin Diagram

Definitions of WTC401SPI Pins:

Pin No.	Pin Name	Usage	Function Description
1	SW8	\|	Capacitive sensor (pulley sense element) interface 8
2	SW9	\|	Capacitive sensor (pulley sense element) interface 9
3	SW10	\|	Capacitive sensor (pulley sense element) interface 10
4	SW11	\|	Capacitive sensor (pulley sense element) interface 11
5	SW12	\|	Capacitive sensor (pulley sense element) interface 12
6	SW13	\|	Capacitive sensor (pulley sense element) interface 13
7	SW14	\|	Capacitive sensor (pulley sense element) interface 14
8	SW15	\|	Capacitive sensor (pulley sense element) interface 15
9	CSEL	\|	Sensitivity adjustable capacitor interface
10	GND	\|	Power ground
11	S0	O	The internal test leg Usually needs to suspend the S0
12	S1	O	The internal test leg Usually needs to suspend the S1
13	SDI	\|	Roller encoder pulse output 1
14	SDO	O	Roller encoder pulse output 0
15	SCK	\|	Data input line of the chip SPI interface is input the sensitivity adjustment data
16	SCS	\|	The data output line of the chip SPI interface is output the key and slider data
17	/RST	\|	Chip reset pin
18	VCC	\|	positive power supply output
19	OUT FLAG	O	Key status indicator has the output low level signal when pressing the key or slide bar, and the output high level signal when the finger leaves the key or slide bar. The initial of the electrifying is the high level output
20	TS	O	The internal test leg needs to suspend the TS
21	SW0	\|	Capacitive sensor (key sense element) interface 0
22	SW1	\|	Capacitive sensor (key sense element) interface 1
23	SW2	\|	Capacitive sensor (key sense element) interface 2
24	SW3	\|	Capacitive sensor (key sense element) interface 3

Chip Application Schematic Diagram:

WTC401SPI

SPI sequence diagram:

Figure 4: Sequence diagram of the SPI interface of WTC401SPI

WTC401SPI

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