AC103003 Microchip Technology, AC103003 Datasheet

AC103003

Manufacturer Part Number

AC103003

Description

BOARD DEMO PIC10F CAP TOUCH

Manufacturer

Microchip Technology

Series

mTouch™r

Datasheets

1.MA180025.pdf (12 pages)

2.AC103003.pdf (2 pages)

3.AC103003.pdf (10 pages)

4.AC103003.pdf (2 pages)

Specifications of AC103003

Sensor Type

Touch, Capacitive

Embedded

Yes, MCU, 8-Bit

Utilized Ic / Part

PIC10F204, PIC10F206

Interface Type

USB

Operating Voltage

2 V to 5.5 V

Data Bus Width

8 bit

Maximum Operating Temperature

+ 125 C

Minimum Operating Temperature

- 40 C

Silicon Manufacturer

Microchip

Silicon Core Number

PIC10F204, PIC10F206

Kit Application Type

Sensing - Touch / Proximity

Application Sub Type

Capacitive Touch

Kit Contents

Board And Literature

For Use With/related Products

PIC10F204/6

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Voltage - Supply

Interface

Sensitivity

Sensing Range

Lead Free Status / Rohs Status

Lead free / RoHS Compliant

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

AC103003

Manufacturer:

Microchip Technology

Quantity:

135

Current page: 1 of 10
Download datasheet (190Kb)

INTRODUCTION

This

implementing capacitive sensing on the PIC10F204/6

family of controllers. It assumes general knowledge of

the sensing process; it is also recommended that

application note AN1101, “Introduction to Capacitive

Sensing”, be read in order to understand the hardware

concepts.

PIC10F204 and PIC10F206 microcontrollers have an

onboard comparator that can be used for capacitive

sensing of a single key.

FIGURE 1:

The output of the comparator will change to the low

state. Then, it discharges slowly through R1 until it

reaches the trip point of the internal band gap reference

of 0.6V. The output of the comparator will go high again

and the cycle repeats itself.

Author:

application

Touchpad

Marcel Flipse

Microchip Technology Inc.

note

BASIC OSCILLATOR SCHEMATIC

describes

Capacitive Sensing with PIC10F

Band Gap

Buffer

0.6V

method

GP0

IMPLEMENTATION

Capacitive sensing is implemented by turning the

comparator into a relaxation oscillator. The output of

the comparator is used to charge and discharge the

sensing capacitor, that is formed by a pad on the circuit

board. The charge rate is determined by the RC time

constant, created by an external resistor and the

capacitance of the pad.

Introduction of additional capacitance from a person’s

finger to ground causes a frequency change. This

change is measured by the PIC

to detect a finger press.

The basic oscillator circuit is shown in Figure 1. C

the

capacitance has no charge and the voltage is zero.

Therefore, the output of the comparator will be high and

the touch pad is rapidly charged through D1 until it

reaches V

OSC

parasitic

GP2

capacitance.

Prescaler

AN1202

1:256

Data bus

During

MCU and processed

TMR0

DS01202B-page 1

start-up

this

Related parts for AC103003

AC103003 Summary of contents

Page 1

... Then, it discharges slowly through R1 until it reaches the trip point of the internal band gap reference of 0.6V. The output of the comparator will go high again and the cycle repeats itself. © 2008 Microchip Technology Inc. IMPLEMENTATION Capacitive sensing is implemented by turning the comparator into a relaxation oscillator. The output of ...

Page 2

... The detection scheme used to detect a finger press is based on the principle that there is rapid drop in frequency counts from the running average finger touches the pad, the capacitance increases and the frequency drops. To initialize the oscillator, the following sequence is needed: /4). The software then OSC © 2008 Microchip Technology Inc. ...

Page 3

... The upper trace shows the oscillator being turned on periodically for 100 ms. The lower trace shows the PIC microcontroller transmitting the real time data serially over the free available pin. © 2008 Microchip Technology Inc. AN1202 FIGURE 3: FREQUENCY BURSTS DETECTING A FINGER PRESS At this point the system is complete, except for the detection and signaling of a button press ...

Page 4

... Thus, the larger the pad, the greater the distance. Any material in between the hand and the sensor may influence the maximum distance. FIGURE 6: PROXIMITY SWITCH © 2008 Microchip Technology Inc ...

Page 5

... Reset until the operating parameters are met. Alternatively, a circuit shown in Figure 7 below can be used. This way, the MCLR pin can still be used as a general purpose input pin. © 2008 Microchip Technology Inc. FIGURE 7: CIRCUIT BOARD DESCRIPTION The full schematic is illustrated in Appendix A. The board can be powered by an external power supply or by the serial port ...

Page 6

... Additional reference materials include: AN1101, “Introduction to Capacitive Sensing” AN1102, “Layout for Capacitive Sensing” AN1103, “Software Handling for Capacitive Sensing” AN1104, “Capacitive Mini-Button Configurations” DS01202B-page 6 © 2008 Microchip Technology Inc. ...

Page 7

Page 8

Page 9

... PowerMate, PowerTool, REAL ICE, rfLAB, Select Mode, Total Endurance, WiperLock and ZENA are trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. SQTP is a service mark of Microchip Technology Incorporated in the U.S.A. All other trademarks mentioned herein are property of their respective companies. ...

Page 10

... Fax: 886-3-572-6459 Taiwan - Kaohsiung Tel: 886-7-536-4818 Fax: 886-7-536-4803 Taiwan - Taipei Tel: 886-2-2500-6610 Fax: 886-2-2508-0102 Thailand - Bangkok Tel: 66-2-694-1351 Fax: 66-2-694-1350 © 2008 Microchip Technology Inc. EUROPE Austria - Wels Tel: 43-7242-2244-39 Fax: 43-7242-2244-393 Denmark - Copenhagen Tel: 45-4450-2828 Fax: 45-4485-2829 France - Paris Tel: 33-1-69-53-63-20 ...

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