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PDF IQS133 Data sheet ( Hoja de datos )
| Número de pieza | IQS133 | |
| Descripción | Minimalist 3 Channel Capacitive Sensor | |
| Fabricantes | Azoteq | |
| Logotipo |  |
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IQ Switch®
ProxSense® Series
IQS133 Datasheet
IQ Switch® - ProxSense® Series
Minimalist 3 Channel Capacitive Sensor with Compensation for Sensitivity Reducing
Objects
Unparalleled Features
Sub 4uA current consumption
Automatic tuning for optimal operation in various environments & compensation against
sensitivity reducing objects
The IQS133 ProxSense® IC is a fully integrated three channel capacitive contact and proximity
sensor with market leading sensitivity and automatic tuning of the sense electrodes. The IQS133
provides a minimalist implementation requiring as few as 2 external components. The device is
ready for use in a large range of applications while programming options allow customisation in
specialized applications.
Main Features
3 Channel input device
Differentiated Touch & Proximity Output
ATI: Automatic tuning to optimum sensitivity
Supply Voltage 3V to 5V
Internal voltage regulator and reference capacitor
OTP options
Direct (logic level) and serial data output
Low Power Modes (sub 4µA min)
Proximity & Touch Thresholds
Automatic drift compensation
MSOP-10
Representations only,
not actual markings
Development and Programming tools available (VisualProxSense and USBProg)
Small outline MSOP–10
Applications
White goods and appliances
Remote Controls
Office equipment, toys, sanitary ware
Flame proof, hazardous environment Human Interface Devices
Proximity detection that enables backlighting activation (Patented)
Wake-up from standby applications
Replacement for electromechanical switches
GUI trigger on proximity detection.
Available options
TA MSOP-10
-40°C to 85°C
IQS133
1 page  
IQ Switch®
ProxSense® Series
5 High Sensitivity
Through patented design and advanced signal other products. When the device is used in
processing, the device is able to provide environments where noise or ground effects
extremely high sensitivity to detect Proximity. exist that lower the sensitivity, a reduced
This enables designs to detect proximities at proximity threshold is proposed to ensure
distances that cannot be equalled by most reliable functioning of the sensor.
6 User Configurable Options
The IQS133 provides One Time that can be used to program the OTP user
Programmable (OTP) user options (each options for prototyping purposes. More details
option can be modified only once). The device regarding the configuration of the device with
is fully functional in the default (unconfigured) the USBProg program is explained by
state. OTP options are intended for specific application note: “AZD007 – USBProg
applications.
Overview” which can be found on the Azoteq
The configuration of the device can be done website.
on packaged devices or in-circuit. In-circuit Alternate programming solutions of the
configuration may be limited by values of IQS133 also exist. For further enquiries
external components chosen.
regarding this matter please contact Azoteq at
6.1 Configuring of Devices
[email protected] or the local
distributor.Table 6-1: User Selectable
Azoteq offers a Configuration Tool (CTxxx) Configuration Options: Bank 0
and accompanying software (USBProg.exe)
Copyright © Azoteq (Pty) Ltd 2012.
All Rights Reserved.
IQS133/133Z Datasheet
Revision 1.6
Page 5 of 23
October 2012
5 Page 
IQ Switch®
ProxSense® Series
Charge Cycle
Duration = tCHARGE
Zoom to Boost Mode after proximity detected
CX
tSAMPLE
tSAMPLE
Figure 7.1 LP Modes: Charge cycles
7.5 ATI Base Value
The sensitivity gain of the Proximity channel
can be set by adjusting the Base Value of the
ATI algorithm. Decreasing the base from 200
to 150 or even 50 will increase the sensitivity
and vice versa. By decreasing the base value,
the analog gain from the sensor is increased.
Configuration: Bank1 bit1-0
BASE1:BASE0: Proximity Base Value
Bit Selection
00 200
01 50
10 100
11 250
7.6 Filters used by the IQS133
The IQS133 devices employ various signal
processing functions that includes the
execution of various filters as described
below.
7.6.1 Long Term Average (LTA)
Capacitive touch devices detect changes in
capacitance that are not always related to the
intended proximity or touch of a human. This
is a result of changes in the environment of
the sense plate and other factors. These
changes need to be compensated for in
various manners in order to reliably detect
touch events and especially to detect
proximity events. One mechanism the IQS133
employs is the use of a Long Term Averaging
filter (IIR type filter) which tracks slow
changes in the environment (expressed as
changes in the counts). The result of this filter
is a Long Term Average (LTA) value that
forms a dynamic reference used for various
functions such as identification of proximity
and touch events.
The LTA is calculated from the counts (CS).
The filter only executes while no proximity or
touch event is detected to ensure
compensation only for environmental
changes. However there may be instances
where sudden changes in the environment or
changes in the environment while a proximity
or touch event has been detected cause the
CS to drift away from the LTA. To
compensate for these situations a Halt Timer
(tHALT) has been defined.
The Halt Timer is started when a proximity or
touch event occurs (for the 133Z, all the
channels‟ filters halt on a proximity event) and
when it expires the LTA filter is recalibrated.
Recalibration causes LTA < CS, thus the
disappearance of proximity or touch events.
The designer needs to select a Halt Timer
value to best accommodate the required
application.
Configuration: Bank1 bit7-6
tHALT1:tHATL0: Halt time of Long Term Average
Bit Selection
00 20 seconds
01 40 seconds
10 Never
11 ALWAYS (Prox on 40 seconds)
Notes:
With the Never (bit selection “10”)
option, the filter will not halt when any
proximity or touch condition occurs.
With the „ALWAYS‟ (bit selection “11”)
option and the detection of a proximity
event the execution of the filter will be
halted for only 40 seconds and with the
detection of a touch event the execution
of the filter will be halted as long as the
touch condition applies.
Copyright © Azoteq (Pty) Ltd 2012.
All Rights Reserved.
IQS133/133Z Datasheet
Revision 1.6
Page 11 of 23
October 2012
11 Page | ||
| Páginas | Total 24 Páginas | |
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