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부품번호 | IQS229 기능 |
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기능 | Single Channel Capacitive Proximity/Touch Controller | ||
제조업체 | Azoteq | ||
로고 | |||
전체 15 페이지수
ProxSense® Series
IQS229 Datasheet
Single Channel Capacitive Proximity/Touch Controller for SAR Applications
The IQS229 ProxSense® IC is a self-capacitance controller designed for devices that are
required to meet SAR regulations. The IQS229 can detect a long term presence through
movement detection algorithms when the device (e.g. tablet or cell phone) is handled.
The IQS229 can be used in any application requiring long-term activation by animated objects.
A movement detection algorithm will indicate the presence of a user and aid in the long-term
stability of the solution. The device operates standalone and can be configured via digital
inputs.
Features
• SAR compliance in mobile devices
according to the IEC 62209-2 ed1.0
standard and the FCC standard (KDB
616217 - D04 SAR for laptop and tablets
v01)
• Failsafe firmware/hardware design
• Automatic Tuning Implementation (ATI) -
Automatic adjustment for optimal sensor
performance
• Minimal external components
• Standalone operation
• 25mm detection distance
• Up to 60pF sensor load
• On-chip movement detection algorithm
• Internal Capacitor Implementation (ICI) –
reference capacitor on-chip
• Configuration settings via external pins
• Activation threshold
• Movement filter threshold
• Activation time-out
• Supply voltage: 1.8V to 3.6V
• Low power consumption: 30uA (sub 10uA
in sleep mode)
• Low profile DFN10 package (3x3)
Applications
• SAR detection for tablets and mobile
phones
• SAR detection for wireless charging
stations (operating frequency > 100 MHz)
• SAR detection for USB dongle-type
devices
• Movement detection devices (anti-theft)
• Reed relay replacement
• White goods and appliances
• Human Interface Devices
• Proximity activated backlighting
• Applications with long-term activation
Copyright © Azoteq 2013
All Rights Reserved
Available Packages
TA DFN10 (3x3)
-40°C to 85°C
IQS229
IQS229 Datasheet v1.0
Page 1 of 15
ProxSense® Series
1.1.5 Integrated features
The device includes an internal voltage
regulator and reference capacitor (Cs).
Various advanced signal processing
techniques are combined for creating a
robust solution.
These techniques include:
• Movement detection filter (to release an
activation in the case of inactivity)
• Advanced noise filtering on incoming
sample stream
• Superior methods of parasitic
capacitance compensation while
preserving sensitivity
1.1.6 Data streaming
A 1-wire data streaming interface is offered
for debugging purposes. Streaming mode
and stand-alone mode are interchangeable
via simple hardware configurations. This is
offered because streaming may be useful
at various stages of a design.
Streaming mode is offered through a simple
pull-up resistor on the standard digital
output pin. Standalone mode is enabled
through a pull-down resistor on this pin.
1.1.7 Hardware configuration options
Various configuration options are made
available through digital input pins. These
include:
• the activation threshold,
• inactivity time-out settings
• and movement threshold selection
Special device configurations are only
available on special request and can be
done by setting one time programmable
(OTP) options. These will only be available
on special orders, aiming to meet most
needs with configuration pins.
1.1.8 Automatic Calibration
Proven Automatic Tuning Implementation
(ATI) algorithms are used to calibrate the
device to the sense electrode. This
algorithm is optimised for applications
where a fixed detection distance (in mid-air)
is required for failure safe detection.
1.1.9 Capacitive sensing method
The charge transfer method of capacitive
sensing is employed on the IQS229. (The
charge transfer principle is thoroughly
described in the application note: “AZD004
- Azoteq Capacitive Sensing”.)
1.2 Operation
1.2.1 Device Setup
Typical device use allows for very little to
no setup before integration. A few
characteristics may be fixed via four of the
IQS229 pins - each having three possible
pin states. This should suffice for most
simple and intended applications.
Note: It is important that any pins
connected to an MCU are kept high
impedance (Hi-Z) from the MCU side during
power-up. This is to ensure correct start-up
especially with a high impedance strap
resistor on the OUT pin for standalone
power-up.
1.2.2 Configuration pin setup
Configuration options are selected by:
• Floating a pin
• pull-up resistor
• pull-down resistor
See section 4 for choosing a specific
configuration. For configurations not
covered by the configuration pins, custom
ICs will be available in bulk orders.
Information on custom configurations are
available on special request.
At start-up device parameters are read and
set according to the configuration pin
states. Configuration pins are then changed
to digital outputs and are written to the state
that was read (for minimising current
consumption). Floating pins are written low.
After configuration, calibration routines are
Copyright © Azoteq 2013
All Rights Reserved
IQS229 Datasheet v1.0
Page 4 of 15
4페이지 ProxSense® Series
4 Configuration Options
4.1 Activation Threshold
The threshold adjustment is offered through
3 configuration pins.
THR0 is a first level of threshold adjustment.
THR1 is a second level for refining the
threshold.
L = LOGIC LOW, H = LOGIC HIGH, F = FLOAT
THR0 (pin 8)
L L L F F F HHH
THR1 (pin 6)
L F HL F HL F H
Corresponding Threshold Level
012345678
◄More sensitive
Less sensitive►
It is important to note that most sensitive
settings are heavily dependent on design
factors influencing SNR. These may be in
order where fail-safe activations are
required, but is not recommended for
activation critical applications.
4.2 Timer Settings
Large environmental shifts (capacitance
increases or decreases) are regarded as
activations. Such conditions are intelligently
cleared via the movement filter and timer.
The timer would reset with each detected
movement. If no movement is detected for
the duration of the timer, the activation will
be cleared. A few options exist for the
duration of this timer.
Timer options are a summarized in the table
below:
TIMER (pin 1) Time-out
Low 60sec
Float
3min
High
10min
For custom timers the IQS229 makes it
possible to distinguish between a threshold
release and a no-movement release. The
master device may then override the IQS229
output until the custom master timer has
expired.
OUT pin
OUT pin
Figure 4.1 Normal release with threshold
crossing (top), time-out release after no-
movement condition (bottom)
4.3 Human movement filter
threshold
The MOV_THR pin offers adjustment of the
threshold used to determine if a movement
event should be triggered. From a default
setting (pin FLOATING), the threshold can
be increased or decreased by a percentage
of the capacitive sensor operating point
(long-term average).
MOV_THR (pin 7)
Movement
Threshold
Low More sensitive
Float
Default
High
Less sensitive
Copyright © Azoteq 2013
All Rights Reserved
IQS229 Datasheet v1.0
Page 7 of 15
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부품번호 | 상세설명 및 기능 | 제조사 |
IQS229 | Single Channel Capacitive Proximity/Touch Controller | Azoteq |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |