qt60320c Quantum Research Group, qt60320c Datasheet

qt60320c

Manufacturer Part Number

qt60320c

Description

32-key Qmatrix? Charge-transfer Ic

Manufacturer

Quantum Research Group

Datasheet

1.QT60320C.pdf (14 pages)

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Download datasheet (380Kb)

NOT RECOMMENDED FOR NEW DESIGNS

APPLICATIONS -

The QT60320 digital charge-transfer (“QT”) QMatrix™ IC is designed to detect touch on up to 32 keys in a scanned X-Y matrix. It will

project the keys through almost any dielectric, like glass, plastic, stone, ceramic, and even most kinds of 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,

Indium-Tin-Oxide (ITO), or screened silver or carbon deposited on the rear of the 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 or more

in area. The gain (sensitivity) and threshold of each key can be set individually via simple commands over the UART port, for example

via the freeware QmBtn program. Key setups are stored internally in an onboard eeprom and do not need to be reloaded.

The IC is designed specifically to work with appliances, ATM machines, security panels, portable instruments, machine tools, or

similar products that are subject to environmental 'challenges' or even physical attack. It permits the construction of 100% sealed,

watertight keypanels that are immune to environmental factors such as humidity and condensation, temperature, dirt accumulation, or

the physical deterioration of the panel surface from abrasion, chemicals, or abuse. To this end the QT60320 contains

Quantum-pioneered self-calibration, drift compensation, and digital filtering algorithms that make the sensing function extremely

robust and survivable.

The device can readily control keys over graphical LCD panels or LEDs when used with clear, conductive ITO electrodes. It does not

require 'chip on glass' or other exotic fabrication techniques, thus allowing the OEM to source the keymatrix from multiple vendors.

External circuitry consists of an opamp, a common PLD, and a quad fet switch, which can fit into a footprint of roughly 1 square inch

(6.5 sq. cm). The device also can control two status LEDs, and includes in addition 8 addressable output drive lines and 4 readable

spare input lines which can be used to control LEDs, LCDs, or other panel functions without requiring additional control lines from the

host CPU. It also makes available to the user 86 bytes of onboard writeable and readable eeprom via the serial interface, thus helping

to reduce system cost by eliminating extra components.

QT60320 technology makes use of an important new variant of charge-transfer sensing, transverse charge-transfer, in an XY format

that minimizes the number of required scan lines. Unlike older technologies it does not require one IC per key, and is cost competitive

even with some membrane technologies. In many cases it can also replace resistive XY sense elements commonly used in touch

screens, at a fraction of the price.

This part is not recommended for new designs. Consult Quantum for advice on alternatives.

Security keypanels

Industrial keyboards

Creates 32 ‘touch buttons’ through any dielectric

100% autocal for life - no adjustments required

'N' key rollover: senses all 32 keys in parallel

Keys individually adjustable for sensitivity

Mix 'n match key sizes & shapes in one panel

Tolerates a 20:1 variance in key sizes on a panel

Panel thicknesses to 5 cm or more

Back lit keys possible with ITO electrodes

LED status function drives

User-addressable multifunction drive pins

User-addressable internal eeprom

Simple, universal serial interface

5V single supply operation

44-pin TQFP package

One square inch (6.5 square cm) of PCB required

Appliance controls

Outdoor keypads

-40

C to +105

AVAILABLE OPTIONS

32-K

ATM machines

Touch-screens

QT60320C-AS

TQFP

ATRIX

RST

Gnd

XT2

Vcc

XT1

™ C

44 43 42 41 40 39 38 37 36

12 13 14

QT60320

HARGE

Automotive panels

Machine tools

-T

QT60320C

QT60320C R1.08/01.03

19 20

RANSFER

CC1

CC2

Aref

AGnd

Vcc

Related parts for qt60320c

qt60320c Summary of contents

... If the voltage on Cs rises excessively it can fall outside of the ADC's range. To reduce the voltage again without affecting gain, one of two (or both) Cz capacitors can be switched to Figure 1-2 Field Flows When Touched Figure 1-3 Fields With a Conductive Film 2 ove rly element elem ent QT60320C R1.08/01.03 ...

Page 3

... The PLD takes as its input all 'X' and 'Y' lines, and with added RC time constants creates the required short dwell time on the Y switches. The code for the PLD is available freely on X drives ( shown Reset switch Cs QT60320C R1.08/01.03 Interdigitated keys ADC ...

Page 4

... Cz capacitors, an amplifier, some analog switches, and an R2R ladder DAC to operate. The Cs capacitor performs the charge integration function by collecting charge coupled though a selected key during the Figure 1-7 Drift Compensation is Hysteresis Threshold could be Output HRESHOLD AND YSTERESIS ALCULATIONS URATION I ETECTION NTEGRATOR Reference Signal QT60320C R1.08/01.03 ...

Page 5

... Two indicator LEDs (optional show sensing state and calibration status; 74AC04 inverters to drive the two banks of analog switches in opposite states; Two 74HC4066 analog switches 15nF A reset mosfet, most any small-signal mosfet with a guaranteed on-state at 4 volts QT60320C R1.08/01. ...

Page 6

... Baud Rate: Parity: Length: Stop bits: These specifications hold if the device is operated from an 8MHz crystal or resonator. 6 basis. The algorithm uses a drive line and a gate A . The acquisition of a key is done using a B 9600 None 8 bits 1 QT60320C R1.08/01.03 successive ...

Page 7

... X1/Y1 immediately following that for the gain. X1/Y2 The gain and threshold settings for all X1/Y3 buttons are held in an internal byte array, starting at address 100 (decimal). X1/Y4 QT60320C R1.08/01.03 R EPORTING R EPORTING ...

Page 8

... 15nF (a common value for the circuit), then each Cz should be 820pF. The Cz capacitors should be of type NPO or C0G ceramic, or PPS film X6/Y1 X5/Y1 X4/Y1 X3/Y1 X6/Y2 X5/Y2 X4/Y2 X3/Y2 X6/Y3 X5/Y3 X4/Y3 X3/Y3 X6/Y4 X5/Y4 X4/Y4 X3/ OMMAND SER ORT RITE - OMMAND SER ORT EAD CAPACITORS Z QT60320C R1.08/01. X2/Y1 X1/Y1 X2/Y2 X1/Y2 X2/Y3 X1/Y3 X2/Y4 X1/Y4 ...

Page 9

... This is a considerable advantage in dealing with ESD. The part's Y control pins do not directly go to the matrix. The 4 user-input pins may be vulnerable and should be resistor and/or diode protected if they are in danger of being subject to ESD. 9 QT60320C R1.08/01.03 ...

Page 10

... F4.com = !(ys4 & !xsd); " enables to 3125 are active low F3.com = !(ys3 & !xsd); F2.com = !(ys2 & !xsd); F1.com = !(ys1 & !xsd The EPLD functions to generate control signals for the QS3125 quad n-channel switch, to POLARITY OUTPUT_TYPE Feed_Pin ) Feed_Pin ) Feed_Pin ) Feed_Pin ) Feed_Pin ) 10 FEEDBACK_TYPE ) QT60320C R1.08/01.03 ...

Page 11

... E6S3 BOARD SCHEMATIC LQ 11 QT60320C R1.08/01.03 ...

Page 12

... Low input logic level V High input logic level HL V Low output voltage OL V High output voltage Input leakage current A R Acquisition resolution LQ Min Typ Max 25 0.8 2.2 0.6 Vdd-0.7 ± +105 Units Notes 4mA sink V 1mA source µA bits QT60320C R1.08/01. ...

Page 13

... TQFP A 0 QT60320C- Inches Min Max Notes 0.386 0.394 SQ 0.458 0.478 SQ 0.003 0.008 0.018 0.030 0.002 0.006 - 0.047 0.012 0.018 0.031 0.031 BSC 0.315 0.315 BSC 0 7 Marking QT60320C-A QT60320C R1.08/01.03 ...

Page 14

Tel: +44 (0)23 8056 5600 Fax: +44 (0)23 8045 3939 Tel: 412-391-7367 Fax: 412-291-1015 The specifications set out in this document are subject to change without notice. All products sold and services supplied by QRG are subject to our ...

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