AT42QT2160 Datasheet, PDF (1/49 Pages) ATMEL Corporation – QSlide™, 16-key QMatrix™ Sensor IC

Features
• Number of keys: up to 16 keys, and one slider (constructed from 2 to 8 keys)
• Number of I/O lines: 11 (3 dedicated - configurable for input or output, 8 shared -
output only), PWM control for LED driving
• Technology: patented spread-spectrum charge-transfer (transverse mode)
• Key outline sizes: 6 mm x 6 mm or larger (panel thickness dependent); widely different
sizes and shapes possible
• Key spacings: 8 mm or wider, center to center (panel thickness dependent)
• Slider design: 2 to 8 keys placed in sequence, same design as keys
• Electrode design: two-part electrode shapes (drive-receive); wide variety of possible
layouts
• PCB layers required: one layer (with jumpers), two layers (no jumpers)
• Electrode materials: PCB, FPCB, silver or carbon on film, ITO 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 3 mm glass, 2.5 mm plastic (key size dependent)
• Key sensitivity: individually settable via simple commands over I²C-compatible
interface
• Interface: I²C-compatible slave mode (100kHz)
• Moisture tolerance: best in class
• Power: 1.8 V to 5.5 V
• Package: 28-pin 4 x 4 mm MLF RoHS compliant
• Signal processing: self-calibration, auto drift compensation, noise filtering, Adjacent
Key Suppression^TM technology
• Applications: laptop, mobile, consumer appliances, PC peripheral etc.
• Patents: AKS™ (patented Adjacent Key Suppression™) technology
QMatrix™ (patented charge-transfer method)
QSlide™ (patented charge-transfer method) (patent-pending QSlide sensing
configuration)
• This datasheet is applicable to revision 4R0 chips only
QSlide™, 16-key
QMatrix™
Sensor IC
AT42QT2160
1. Overview
The AT42QT2160-MMU (QT2160) is designed for use with up to 16 keys and a slider
(constructed from 2 keys up to 8 keys). There are three dedicated General Purpose
Input/Outputs (GPIOs) which can be used as inputs for mechanical switches etc. or as driven
outputs. There are eight shared General Purpose Outputs (GPOs) (X0...X7) which are driven
outputs only. There is PWM control for all GPIO/GPOs.
The 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. This directs the charge into a sampling capacitor which is then
converted directly to digital form, without the use of amplifiers.
The 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.
9502A–AT42–07/08