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PDF QT60240 Data sheet ( Hoja de datos )
| Número de pieza | QT60240 | |
| Descripción | (QT60160 / QT60240) 16 AND 24 KEY QMATRIX TOUCH SENSOR ICs | |
| Fabricantes | QUANTUM | |
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lQ
QT60160, QT60240
16 AND 24 KEY QMATRIX™ TOUCH SENSOR ICs
These devices are designed for low cost mobile and consumer electronics
applications.
QMatrix™ technology employs transverse charge-transfer sensing electrode
designs which can be made very compact and are easily wired. Charge is
forced from an emitting electrode into the overlying panel dielectric, and then
collected on a receiver electrode which directs the charge into a sampling
capacitor which is then converted directly to digital form without the use of
amplifiers.
Keys are configured in a matrix format that minimizes the number of required
scan lines and device pins. The key electrodes can be designed into a
conventional Printed Circuit Board (PCB) or Flexible Printed Circuit Board
(FPCB) as a copper pattern, or as printed conductive ink on plastic film.
M_SYNC
CHANGE
VSS
VDD
VSS
VDD
X6
X7
32 31 30 29 28 27 26 25
1 24
2 23
3 QT60240 22
4 QT60160 21
5 20
6 MLF-32 19
7 18
8 17
9 10 11 12 13 14 15 16
Y1B
Y0B
A0
VSS
VDD
A1
VDD
X5
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
Interface:
I2C slave mode (100kHz), or parallel output via external shift registers
Moisture tolerance: Best in class.
Power:
1.8V ~ 5.5V, 40µA (16 keys at 1.8V, 2s Low Power mode). Guaranteed to 1.62V.
Package:
32-pin 5 x 5mm MLF RoHS compliant
Signal processing: Self-calibration, auto drift compensation, noise filtering, Adjacent Key Suppression TM
Applications:
Mobile phones, remote controls, domestic appliances, PC peripherals, automotive
†Orgacon is a registered tra demark of Agfa-Gevaert N.V
LQ
Part Number
QT60160-ISG
QT60240-ISG
AVAILABLE OPTIONS
Keys
16
24
TA
-400C to +850C
-400C to +850C
Copyright © 2006 QRG Ltd
QT60240-ISG R8.06/0906
1 page  
Figure 2.5 Probing X-Drive
Waveforms With a Coin
Figure 2.6 Recommended Key Structure
‘T’ should ideally be similar to the complete thickness the fields
need to penetrate to the touch surface. Smaller dimensions will also
work but will give less signal strength. If in doubt, make the pattern
coarser. The lower figure shows a simpler structure used for
compact key layouts, for example for mobile phones. A layout with a
common X drive and three receive electrodes is depicted.
Y0
QmBtn software is available free of charge on Quantum’s
website www.qprox.com.
The signal swing from the smallest finger touch should
preferably exceed 8 counts, with 12 being a reasonable
target. The signal threshold setting (NTHR) should be set to a
value guaranteed to be less than the signal swing caused by
the smallest touch.
Increasing the burst length (BL) parameter will increase the
signal strengths as will increasing the sampling resistor (Rs)
values.
X0
Y1
Y2
2.7 Matrix Series Resistors
The X and Y matrix scan lines can use series resistors
(referred to as Rx and Ry respectively) for improved EMC
performance (Figure 2.7, page 9).
X drive lines require Rx in most cases to reduce edge rates
and thus reduce RF emissions. Typical values range from
1K✡ to 20K✡.
Y lines need Ry to reduce EMC susceptibility problems and in
some extreme cases, ESD. Typical Y values are about 1K✡.
Y resistors act to reduce noise susceptibility problems by
forming a natural low-pass filter with the Cs capacitors.
It is essential that the Rx and Ry resistors and Cs capacitors
be placed very close to the chip. Placing these parts more
than a few millimeters away opens the circuit up to high
frequency interference problems (above 20MHz) as the trace
lengths between the components and the chip start to act as
RF antennae.
The upper limits of Rx and Ry are reached when the signal
level and hence key sensitivity are clearly reduced. The limits
of Rx and Ry will depend on key geometry and stray
capacitance, and thus an oscilloscope is required to
determine optimum values of both.
Dwell time is the duration in which charge coupled from X to
Y is captured (Figure 2.4, page 4). Increasing Rx values will
cause the leading edge of the X pulses to increasingly roll off,
causing the loss of captured charge (and hence loss of signal
strength) from the keys.
The dwell time of these parts is fixed at 500ns. If the X pulses
have not settled within 500ns, key gain will be reduced; if this
happens, either the stray capacitance on the X line(s) should
be reduced (by a layout change, for example by reducing X
line exposure to nearby ground planes or traces), or, the Rx
resistor needs to be reduced in value (or a combination of
both approaches).
lQ
5 QT60240-ISG R8.06/0906
5 Page 
3.4 CHANGE Pin
Pin 2 (CHANGE) is an active-high output that can be used to
alert the host to key touches or key releases, thus reducing
the need for wasteful I2C communications. Normally, the host
can simply not bother to communicate with the device, except
when the CHANGE pin goes high.
CHANGE becomes active only when there is a change in key
state (either touch or touch release); CHANGE goes low
again only when the host performs a read from address 1, the
detect status register for all keys on Y0. CHANGE does not
self-clear; only an I2C read from location 1 will cause it to
clear.
It is important to read all three key state addresses to ensure
the host has a complete picture of which keys have changed.
In Shift Register mode the CHANGE pin does not operate
and should be left open.
Every key can be individually configured to wake a host
microcontroller upon a touch change; so, a product can wake
from sleep when any key state changes, or only when certain
desired keys change state. The configuration is set in the
Setups block (Section 6.13) on a key-by-key basis.
Key Scan
SCL
SDA
LATCH
Figure 3.2 Shift Register Cycle
Key 0 Key 1 Key 2 Key 21 Key 22 Key 23
Key 0
Key 3
Key 4
tSCL
tSCH
tSDA-SCL
Key 23
tLATCH
lQ
11 QT60240-ISG R8.06/0906
11 Page | ||
| Páginas | Total 26 Páginas | |
| PDF Descargar | [ Datasheet QT60240.PDF ] | |
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