E240B Atmel, E240B Datasheet

E240B

Manufacturer Part Number

E240B

Description

BOARD EVAL FOR QT240-IS QTOUCH

Manufacturer

Atmel

Series

Quantum, QTouch™r

Datasheets

1.QT240-ISSG.pdf (12 pages)

2.E240B.pdf (1 pages)

Specifications of E240B

Sensor Type

Touch, Capacitive

Sensing Range

4 Buttons/Keys

Voltage - Supply

7 V ~ 12 V

Embedded

Utilized Ic / Part

QT240

Lead Free Status / RoHS Status

Contains lead / RoHS non-compliant

Interface

Sensitivity

Lead Free Status / Rohs Status

Lead free / RoHS Compliant

For Use With/related Products

QT240-ISS

Other names

427-1113

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

E240B

Manufacturer:

Atmel

Quantity:

135

Current page: 1 of 12
Download datasheet (277Kb)

APPLICATIONS

! PC Peripherals

! Backlighted buttons

The QT240 charge-transfer (“QT’”) QTouch IC is a self-contained digital sensor IC capable of detecting near-proximity or touch

on four electrodes. It allows electrodes to project independent sense fields through any dielectric like glass, plastic, stone,

ceramic, and wood. It can also turn metal-bearing objects into intrinsic sensors, making them responsive to proximity or touch.

This capability coupled with its continuous self-calibration feature can lead to entirely new product concepts , adding high value

to product designs.

Each of the channels operate s independently of the others, and each can be tuned for a unique sensitivity level by simply

changing its sample capacitor value. Two speeds are supported, one of which consumes on ly 90µA of typical current at 4V.

Unique among capacitance sensors, the device incorporates spread -spectrum modulation for unsurpassed EMC compliance.

The devices are designed specifically for human interfaces, like control panels, appliances, gaming devices, lighting controls,

or anywhere a mechanical switch or button may be found; they may also be used for some material sensing and control

applications.

These devices feature a SYNC pin which allows for synchronization with additional similar parts and/or to an external source to

suppress interference. This pin doubles as a drive pin for spread-spectrum modulation. Option pins are provided which allow

different timing and feature settings.

The RISC core of these devices use signal processing techniques pioneered by Quantum which are designed to survive

numerous real-world challenges, such as ‘stuck sensor’ conditions, component aging, moisture films, and signal drift.

By using the charge-transfer principle, these devices deliver a level of performance clearly superior to older technologies yet

are highly cost-effective.

Four independent charge-transfer (‘QT’) touch keys

Individual outputs per channel - active high

Projects prox fields through any dielectric

Sensitivity easily adjusted on a per-channel basis

100% autocal for life - no adjustments required

3.9V ~ 5.5V single supply operation

10s, 60s, infinite autorecal timeout (strap options)

Sync pin for line sync to suppress noise

Spread spectrum operation

Pin options for auto recalibration timings

Extremely low cost per key

20-SSOP RoHS compliant package

! Appliance controls

! Security systems

-40

C to +85

AVAILABLE OPTIONS

! Access systems

! Pointing devices

4 K

QT240-ISSG

SSOP-20

SS/SYNC

SNS2K

SNS1K

OUT1

OUT2

OUT3

SNS2

SNS1

VSS

n.c.

OUCH

QT240-ISSG

20-SSOP

! Instrument panels

! Gaming machines

QT240

™ S

QT240R R1.11/1006

ENSOR

SNS3K

SNS3

SNS4K

SNS4

n.c.

OSC

VDD

/RES

OUT4

n.c.

Related parts for E240B

E240B Summary of contents

Page 1

Four independent charge-transfer (‘QT’) touch keys " Individual outputs per channel - active high " Projects prox fields through any dielectric " Sensitivity easily adjusted on a per-channel basis " 100% autocal for life - no adjustments required ...

Page 2

Contents 1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...

Page 3

Overview 1.1 Introduction QT240 devices are burst mode digital charge-transfer (QT) sensor ICs designed specifically for touch controls; they include all hardware and signal processing functions necessary to provide stable sensing under a wide variety of conditions. Only a ...

Page 4

Figure 1.2 Fast, Spread-spectrum Circuit RSNS1 RSNS2 22K 22K CS2 CS1 10nF R1 10nF RS2 1M 2.2K RS1 2.2K S1 SPEED OPT VDD OUT1 OUT2 OUT3 QT240_ISS OUT4 Multiple touch electrodes connected to any SNSnK can be used, for example, ...

Page 5

The signal drift compensation is 'asymmetric'; the reference level drift-compensates in one direction faster than it does in the other. Specifically, it compensates faster for decreasing signals than for increasing signals. Increasing signals should not be compensated for quickly, since ...

Page 6

Table 2.1 S1 Speed / Sync Options - SNS1K Pin 4 Fast / Spread Spectrum Slow / Sync Table 2.2 OPT Options S2 S3 SNS3K pin 20 SNS4K pin 18 DC Out Vss Vdd Vdd Vss DC Out Toggle Vdd ...

Page 7

Power Supply, PCB Layout The power supply can range from 3 volts. If this fluctuates slowly with temperature, the device will track and compensate for these changes automatically with only minor changes in sensitivity. If the ...

Page 8

Higher values of Rsns will make crosstalk problems worse; try to keep Rsns to 22K or less if possible. In general try to keep the QT240 close to the electrodes and reduce the adjacency of the sense wiring to ground ...

Page 9

Specifications 4.1 Absolute Maximum Specifications Operating temp ...

Page 10

Signal Processing Vdd = 4.0V 10pF 10nF, Fosc = 100kHz recommended range, unless otherwise noted Description Threshold differential (positive) Hysteresis Fast negative threshold differential Consensus filter length (Detection integrator) Positive drift compensation rate ...

Page 11

Marking QT240-ISSG xxxx = fab code 4.8 Moisture Sensitivity Level (MSL) MSL Rating lQ Part Temperature Range +85 C QT240-IG © QRG xxxxR 1 Peak Body Temperature O MSL3 260 C 11 Package SSOP-20 ...

Page 12

This device is covered under one or more United States and corresponding international patents. QRG patent numbers can be found online at www.qprox.com. Numerous further patents are pending, which may apply to this device or the applications thereof. The ...

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