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RD1136

更新时间： 2024-11-06 14:57:15

品牌	Logo	应用领域
莱迪思 - LATTICE		/
页数	文件大小	规格书
5页	687K
描述
Capacitive Touch Sense Controller - Documentation

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RD1136 数据手册

Capacitive Touch Sense Controller

October 2012

Reference Design RD1136

Introduction

Capacitive sensing is a technology based on capacitive coupling which takes human body capacitance as input.

Capacitive touch sensors are used in many devices such as laptop trackpads, digital audio players, computer dis-

plays, mobile phones, mobile devices, tablets and more. Capacitive sensors are preferred for their versatility, reli-

ability and robustness, unique human-device interface and cost reduction over mechanical switches.

The Capacitive Touch Sense Controller reference design demonstrates touch sensing and control using the

iCE40™ FPGA. This design implements four touch sense buttons with outputs to LEDs.

This reference design is implemented in Verilog. The Lattice iCEcube2™ Place and Route tool integrated with the

Synplify Pro synthesis tool is used for implementation of the design. The design can also be targeted to other

iCE40 family members.

Features

• Four capacitive touch sensitive user buttons

• Up to four LED toggle control outputs

• 3.3 MHz frequency operation

• Touch sensitive resolution up to 300ns

Functional Description

Figure 1. Block Diagram

BTN1

BTN2

LED1

LED2

LED3

LED4

Capacitive

Touch

Capacitive

Touch

Sense

LED

BTN3

BTN4

Button

Block

Sense

Controller

CLK_3P3_MHz

or product names are trademarks or registered trademarks of their respective holders. The specifications and information herein are subject to change without notice.

www.latticesemi.com

rd1136_01.0

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