qt60325b-as Quantum Research Group, qt60325b-as Datasheet

qt60325b-as

Manufacturer Part Number

qt60325b-as

Description

32, 48, 64 Key Qmatrix? Keypanel Sensor Ics

Manufacturer

Quantum Research Group

Datasheet

1.QT60325B-AS.pdf (42 pages)

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APPLICATIONS

The QT60325B, QT60485B, and QT60645B digital charge-transfer (“QT”) QMatrix™ ICs are designed to detect human touch on

up to 32, 48, or 64 keys respectively using a scanned, passive X-Y matrix. It will project the keys through almost any dielectric, e.g.

glass, plastic, stone, ceramic, and even wood, up to thicknesses of 5 cm or more. The touch areas are defined as simple 2-part

interdigitated electrodes of conductive material, like copper or screened silver or carbon deposited on the rear of a control panel.

Key sizes, shapes and placement are almost entirely arbitrary; sizes and shapes of keys can be mixed within a single panel of

keys and can vary by a factor of 20:1 in surface area. The sensitivity of each key can be set individually via simple functions over

the SPI port, for example via Quantum’s QmBtn program. Key setups are stored in an onboard eeprom and do not need to be

reloaded with each power-up.

These ICs are designed specifically for appliances, electronic kiosks, security panels, portable instruments, machine tools, or

similar products that are subject to environmental influences or even vandalism. They permit the construction of 100% sealed,

watertight control panels that are immune to humidity, temperature, dirt accumulation, or the physical deterioration of the panel

surface from abrasion, chemicals, or abuse. To this end the devices contain Quantum-pioneered adaptive self-calibration, drift

compensation, and digital filtering algorithms that make the sensing function robust and survivable. The devices use short dwell

times and Quantum’s patent-pending AKS™ feature to permit operation in wet environments.

The parts use a passive key matrix, dramatically reducing cost over older technologies that require an ASIC for every key. The

key-matrix can be made of standard flex material (e.g. Silver on PET plastic) or ordinary PCB material to save cost.

External circuitry consists of an opamp, R2R ladder-DAC network, a common PLD, a FET switch, and a small number of resistors

and capacitors which can fit into a footprint of roughly 8 sq. cm (1.5 sq. in). Control and data transfer is via a SPI port which can

be configured in either a Slave or Master/Slave mode.

QT60xx5B ICs make use of an important new variant of charge-transfer sensing, transverse charge-transfer, in a matrix format

that minimizes the number of required scan lines to provide a high economy of scale.

The B version is identical to the earlier QT60xx5 parts in all respects except that the device exhibits lower signal noise.

QT60xx5B replaces QT60xx5 parts with no circuit changes. After 2003, QT60xx5 devices will no longer be available.

Security keypanels

Industrial keyboards

Advanced second generation QMatrix controllers

Up to 32, 48 or 64 touch keys through any dielectric

Panel thicknesses to 5 cm or more

100% autocal for life - no adjustments required

Keys individually adjustable for sensitivity, response time,

and many other critical parameters

Mix and match key sizes & shapes in one panel

Passive matrix - no components at the keys

Moisture suppression capable

AKS™ - Adjacent Key Suppression feature

Synchronous noise suppression

Sleep mode with wake pin

SPI Slave or Master/Slave interface to a host controller

Low overhead communications protocol

44-pin TQFP package

Appliance controls

Outdoor keypads

32, 48, 64 K

-40

C to +105

QT60325B, QT60485B, QT60645B

AVAILABLE OPTIONS

ATM machines

Touch-screens

QT60325B-AS

QT60485B-AS

QT60645B-AS

QMatrix

TQFP

X2WS

SCLK

MISO

MOSI

RST

XTO

Vdd

Vss

XTI

™

44 43 42 41 40 39 38 37 36

12 13 14

EYPANEL

QT60325B

QT60485B

QT60645B

TQFP-44

Automotive panels

Machine tools

Pat Pend. R1.06/0403

19 20

ENSOR

CZ2

YS0

YS1

YS2

Aref

AGnd

AVdd

YC7

YC6

YC5

YC4

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