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IQS525 Schematic ( PDF Datasheet ) - Azoteq

Teilenummer IQS525
Beschreibung Capacitive Controller Platform
Hersteller Azoteq
Logo Azoteq Logo 




Gesamt 30 Seiten
IQS525 Datasheet, Funktion
ProxSense®
IQS550/572/525/512 Capacitive Controller Platform
IQS5xx-A000 Trackpad/Touchscreen Controller
Multiple Channel Projected Capacitive Controller, with Proximity, Touch and Snap
The IQS5xx-A000 is a projected capacitive touch and proximity trackpad/touchscreen
controller implementation on the IQS550, IQS572, IQS525 and IQS512 platforms. The
IQS5xx-A000 features best in class sensitivity, signal-to-noise ratio and automatic tuning
of electrodes. Low power proximity detection allows extreme low power operation.
Main Features
Proximity, touch and snap* on each channel
Multi-touch and multi-hover support
3584 x 2304 resolution (IQS550)
I2CTM communications interface
ATI: automatic tuning for optimum sensitivity
Supply Voltage 1.65V to 3.6V
Proximity low power operation (<10uA)
Event mode and streaming modes
Dedicated proximity channel for long range proximity sensing
Internal voltage regulator and reference capacitor
On-chip noise detection and suppression
Maximum channels
Minimum report rate
(with dual touch / max channels active)
Resolution
(for shown Tx Rx configurations)
IQS550
150
100Hz
3584 x 2304
(15 x 10)
IQS572
72
170Hz
2048 x 1792
(9 x 8)
IQS525
25
220Hz
1280 x 768
(6 x 4)
IQS512
12
400Hz
768 x 512
(4 x 3)
Applications
Compact Capacitive Keyboards
Remote Control Trackpads
Appliances
Navigation devices
Kiosks and POS terminals
E-readers
Consumer electronics
Available options
TA QFN(7x7)-48 QFN(4x4)-28 QFN(4x4)-28
-40°C to 85°C
IQS550
IQS572
IQS525
*patents pending
TSSOP-20
IQS512
Copyright © Azoteq (Pty) Ltd
All Rights Reserved.
IQS5xx-A000 Trackpad Datasheet
Revision 1.11
Page 1 of 79
April 2015






IQS525 Datasheet, Funktion
IQ Switch®
ProxSense® Series
1 Overview
The IQS550 / IQS572 / IQS525 / IQS512 is a capacitive sensing controller designed for multi-
touch applications using projected capacitance touch panels. The device offers high sensitivity
proximity/hover (PROX) detection and contact detection (TOUCH) through a selectable
number of sensor lines (Rx’s and Tx’s).
Touch and proximity positions are calculated to provide multiple X-Y coordinates.
The device has an internal voltage regulator and Internal Capacitor Implementation (ICI) to
reduce external components. Advanced on-chip signal processing capabilities yields a stable
high performance capacitive controller with high sensitivity.
The controller uses the principle of projected capacitance charge transfer on the trackpad.
When a conductive object such as a human finger approaches the sense plate it will decrease
the detected capacitance. Observing the measured results at various sensing points on the
trackpad enables the controller to determine PROX and TOUCH on all channels, and
accurately determine the coordinates on the touch area. Multiple touch positions can thus be
obtained.
Due to the advanced sensitivity of the device, MULTIPLE non-contact (proximity hover) co-
ordinates can also be obtained. These hover co-ordinates can be used to predict the touch
co-ordinate of an approaching user, before the touch is made, allowing innovative user
interface options.
Multiple filters are implemented to suppress and detect noise and track slow varying
environmental conditions, and avoid effects of possible drift. The Auto Tuning (ATI) allows for
the adaptation to a wide range of touch screens without using external components.
An innovative addition, known as a Snap* (Click), is also available on each channel. This
adds another output additional to the PROX and TOUCH of each channel.
The trackpad application firmware on the IQS5xx is very flexible in design, and can incorporate
standard touch sensors, trackpad / touchscreen areas (giving XY output data) and
conventional snap-dome type buttons, all providing numerous outputs such as Prox, Touch,
Snap, Touch Strength and actual finger position even before physical contact, all in one
solution.
This datasheet applies to the following IQS550 version:
Product Number 40 / Project Number 0 / Version Number 56
This datasheet applies to the following IQS572 version:
Product Number 58 / Project Number 0 / Version Number 1
This datasheet applies to the following IQS525 version:
Product Number 52 / Project Number 0 / Version Number 3
This datasheet applies to the following IQS512 version:
Product Number 53 / Project Number 0 / Version Number 2
*patents pending
Copyright © Azoteq (Pty) Ltd
All Rights Reserved.
IQS5xx-A000 Trackpad Datasheet
Revision 1.11
Page 6 of 79
April 2015

6 Page









IQS525 pdf, datenblatt
IQ Switch®
ProxSense® Series
Table 2.3 QFN48 Pin-out
Pin Name
Description
15
1 TOUT Global Touch Output
16
2 SDA
I2C Data
3 SCL
I2C Clock
4 VDDHI Supply Voltage
5
VSS
Ground Reference
6
VREG
Internal Regulator
Voltage
7
NRST
Reset (active LOW)
8 RDY
I2C RDY
9
RFIN
RF antenna input
10 Rx0 Receiver electrode
11 Rx1 Receiver electrode
12 Rx2 Receiver electrode
13 Rx3 Receiver electrode
14 Rx4 Receiver electrode
17
18
19
20
21
22
23
24
25
26
27
28
Rx5 /
TX4
Rx6 /
TX3
Rx7 /
TX2
Tx1
Tx0
PD2
PD3
PD4
PD5
PD6
PD7
PB0
PGM
POUT
Receiver / Transmitter
electrode
Receiver / Transmitter
electrode
Receiver / Transmitter
electrode
Transmitter electrode
Transmitter electrode
General purpose I/O
General purpose I/O
General purpose I/O
General purpose I/O
General purpose I/O
General purpose I/O
General purpose I/O
Programming Pin
Global Prox Output
Copyright © Azoteq (Pty) Ltd
All Rights Reserved.
IQS5xx-A000 Trackpad Datasheet
Revision 1.11
Page 12 of 79
April 2015

12 Page





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