Y2B X4
SMP X3
SDA X2
SCL X1
/RST X0
Y0A S_SYNC
Y1A VREF
Y2A LATCH
lQ QT60160, QT60240
16 AND 24 KEY QMATRIX TOUCH SENSOR ICs
These devices are designed for low cost mobile and consumer electronics
applications.
31 30 27 25
32 29 28 26
QMatrix technology employs transverse charge-transfer sensing electrode
M_SYNC 1 24 Y1B
designs which can be made very compact and are easily wired. Charge is
CHANGE 2 23 Y0B
forced from an emitting electrode into the overlying panel dielectric, and then
VSS 3 22 A0
QT60240
collected on a receiver electrode which directs the charge into a sampling
VDD 4 QT60160 21 VSS
capacitor which is then converted directly to digital form without the use of
VSS 5 20 VDD
amplifiers.
VDD 6 MLF-32 19 A1
Keys are configured in a matrix format that minimizes the number of required
X6 7 18 VDD
scan lines and device pins. The key electrodes can be designed into a
X7817 X5
910 11 12 13 14 15 16
conventional Printed Circuit Board (PCB) or Flexible Printed Circuit Board
(FPCB) as a copper pattern, or as printed conductive ink on plastic film.
AT A GLANCE
Number of keys: 1 to 16 (QT60160), or 1 to 24 (QT60240)
Technology: Patented spread-spectrum charge-transfer (transverse mode)
Key outline sizes: 6mm x 6mm or larger (panel thickness dependent); widely different sizes and shapes possible
Key spacings: 8mm or wider, center to center (panel thickness dependent)
Electrode design: Two-part electrode shapes (drive-receive); wide variety of possible layouts
Layers required: One layer (with jumpers), two layers (no jumpers)
Electrode materials: PCB, FPCB, silver or carbon on film, ITO on film, Orgacon ink on film
Panel materials: Plastic, glass, composites, painted surfaces (low particle density metallic paints possible)
Adjacent Metal: Compatible with grounded metal immediately next to keys
Panel thickness: Up to 50mm glass, 20mm plastic (key size dependent)
Key sensitivity: Individually settable via simple commands over serial interface
2
Interface: I C slave mode (100kHz), or parallel output via external shift registers
Moisture tolerance: Best in class.
Power: 1.8V ~ 5.5V, 40A (16 keys at 1.8V, 2s Low Power mode). Guaranteed to 1.62V.
Package: 32-pin 5 x 5mm MLF RoHS compliant
TM
Signal processing: Self-calibration, auto drift compensation, noise filtering, Adjacent Key Suppression
Applications: Mobile phones, remote controls, domestic appliances, PC peripherals, automotive
Orgacon is a registered trademark of Agfa-Gevaert N.V
AVAILABLE OPTIONS
Part Number Keys T
A
0 0
QT60160-ISG 16 -40 C to +85 C
0 0
QT60240-ISG 24 -40 C to +85 C
LQ Copyright 2006 QRG Ltd
QT60240-ISG R8.06/0906Contents
1 Overview 5 I2C Operation
............................... 3 ............................ 15
1.1 Introduction 5.1 Interface Bus
............................ 3 ........................... 15
1.2 Part Differences 5.2 Transferring Data Bits
.......................... 3 ....................... 15
1.3 Enabling / Disabling Keys 5.3 START and STOP Conditions
..................... 3 ................... 15
5.4 Address Packet Format
2 Hardware and Functional
..................... 3 ...................... 15
2.1 Matrix Scan Sequence 5.5 Data Packet Format
....................... 3 ........................ 15
2.2 Burst Paring 5.6 Combining Address and Data Packets Into a Transmission
............................ 3 .... 16
2.3 Cs Sample Capacitor Operation
6 Setups
.................. 3 ................................ 17
2.4 Sample Capacitor Saturation 6.1 Introduction
................... 4 ............................ 17
2.5 Sample Resistors 6.2 Negative Threshold - NTHR
......................... 4 .................... 17
2.6 Signal Levels 6.3 Positive Threshold - PTHR
........................... 4 .................... 17
2.7 Matrix Series Resistors 6.4 Drift Compensation - NDRIFT, PDRIFT
...................... 5 .............. 17
2.8 Key Design 6.5 Detect Integrators - NDIL, FDIL
............................ 6 .................. 18
2.9 PCB Layout, Construction 6.6 Negative Recal Delay - NRD
..................... 6 .................... 18
2.9.1 Overview
6.7 Positive Recalibration Delay - PRD
........................... 6 ................ 18
2.9.2 LED Traces and Other Switching Signals
6.8 Burst Length - BL
.............. 6 ......................... 19
2.9.3 PCB Cleanliness
6.9 Adjacent Key Suppression - AKS
........................ 6 ................. 19
2.10 Power Supply Considerations 6.10 Oscilloscope Sync - SSYNC
.................. 6 ................... 19
2.11 Startup / Calibration Times 6.11 Mains Sync - MSYNC
.................... 7 ...................... 19
2.12 Reset Input 6.12 Sleep Duration - SLEEP
........................... 7 ..................... 20
2.13 Spread Spectrum Acquisitions 6.13 Wake on Key Touch - WAKE
.................. 7 ................... 20
2.14 Detection Integrators 6.14 Awake Timeout - AWAKE
....................... 7 .................... 20
2.15 Sleep 6.15 Drift Hold Time - DHT
.............................. 7 ...................... 20
2.16 Wiring 6.16 Setups Block
.............................. 8 .......................... 21
3 Interfaces 7 Specifications
.............................. 10 ........................... 23
3.1 Introduction 7.1 Absolute Maximum Electrical Specifications
............................ 10 ............ 23
3.2 Shift Register Output Mode 7.2 Recommended Operating Conditions
.................... 10 ............... 23
3.3 I2C Port 7.3 DC Specifications
.............................. 10 ......................... 23
3.4 CHANGE Pin 7.4 Timing Specifications
........................... 11 ....................... 23
7.5 Power Consumption
4 Control Commands
........................ 12 ........................ 24
4.1 Introduction 7.6 Mechanical Dimensions
............................ 12 ...................... 25
4.2 Writing Data to the Device 7.7 Marking
..................... 12 .............................. 25
4.3 Reading Data From the Device 7.8 Moisture Sensitivity Level (MSL)
.................. 12 .................. 25
4.4 Report Detections for All Keys
................... 12
4.5 Raw Data Commands
....................... 13
4.6 Cal All
............................... 13
4.7 Setups
.............................. 13
lQ 2 QT60240-ISG R8.06/0906