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PDF IQS316 Data sheet ( Hoja de datos )
| Número de pieza | IQS316 | |
| Descripción | Multi-channel Capacitive Sensing Controller | |
| Fabricantes | Azoteq | |
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IQS316 Datasheet
IQ Switch® - ProxSense® Series
Multi-channel Capacitive Sensing Controller with Advanced Signal Processing Functions
The IQS316 is a 20 channel surface capacitive touch and proximity controller with advanced on-
chip signal processing features, including Antenna Tuning Implementation (ATI). Proximity
detection can be distributed over all keys, or only selected keys, providing high flexibility for stable
operation in varying designs. The controller is based on patented capacitive sensing technology
that yields stability with high sensitivity and excellent noise immunity. This controller can operate
with a small number of external components to provide a low cost solution for medium to high
channel count applications.
Main Features
16 Touch Keys with distributed Proximity Sensing
Internal Capacitor Implementation (ICI). No external reference capacitors required
Class leading proximity sensitivity with dedicated Prox Mode charging scheme
User selectable gain through Antenna Tuning Implementation (ATI)
All channels individually configurable for maximum design flexibility
Advanced on-chip signal processing
User selectable I2C and SPI communication
High sensitivity
Internal voltage regulator
Supply voltage 2.85V-5.5V
Low power modes (45uA)
Active shield options
RF detection
Available in QFN(5x5)-32 package
8 General Purpose I/O’s
Applications
Representation
only, not actual
marking
Office machines
Digital cameras
Keypads
High-end kitchen appliances
Personal Media Players
Consumer Electronics
White goods and appliances
Kiosk and POS Terminals
Launch a menu on user approaching
Available options
TA
-40°C to 85°C
QFN32
IQS316
Copyright © Azoteq (Pty) Ltd 2015
All rights reserved.
IQS316 Datasheet
Revision 1.02
Page 1 of 27
April 2015
1 page  
IQ Switch®
ProxSense® Series
Table 2.1 QFN32 top view
In Table 2.2 a description of all
Pin Name
Description
communication pins are given.
1 MOSI-I2CA0 Refer to Table 2.2
Table 2.2 Communication pins
2 SOMI-SDA Refer to Table 2.2
SPI
I2C
3 RDY
Refer to Table 2.2
Name Description Name Description
4
SCK-SCL
Refer to Table 2.2
MOSI Master Out I2CA0 Sub-Address
5
/SS-IRDY
Refer to Table 2.2
Slave In
0
6
POUT
Proximity output
SOMI Slave Out SDA Data
7 SPI_ENABLE Comms Selection
Master In
8
/MCLR
Master Clear
/SS Slave Select IRDY I2C Ready
9
VDDHI
Supply Voltage
SCK Serial Clock SCL Clock
10 RFIN
RF Noise Input
RDY SPI Ready Not used
11 VSS
12 ICTRL
Ground Reference
Current Reference
Pins are used as defined in the standard
communications protocols, except for the
13 ZC
ZC Input
additional RDY pin in SPI mode and the
14
SHLD_B
Shield
IRDY pin in I2C mode. The ready is an
15
SHLD_A
Shield
indication to the master that data transfer is
16 VREG
Internal Regulator ready to be initiated (that the communication
Voltage
window is available).
17 CxB0
18 CxB1
19 CxB2
20 CxB3
21 CxA0
22 CxA1
23 CxA2
Cx Sensor Line
Cx Sensor Line
Cx Sensor Line
Cx Sensor Line
Cx Sensor Line
Cx Sensor Line
Cx Sensor Line
2.2 ICTRL
A reference resistor of 39k MUST be placed
from the ICTRL I/O to ground, as shown in
Figure 1.1. It is very important that the track
to the resistor must be as short as possible,
with the other side having a good connection
to ground.
24
25
CxA3
CxB4
Cx Sensor Line
/ Cx Sensor Line / I/O
3 ProxSense® Module
GPIO_0
26 CxB5/
Cx Sensor Line / I/O The device contains a ProxSense® module
GPIO_1
that uses patented technology to provide
27
28
29
CxB6
GPIO_4
CxB7
GPIO_5
CxA4
GPIO_2
/ Cx Sensor Line / I/O
/ Cx Sensor Line / I/O
/ Cx Sensor Line / I/O
detection of PROX/TOUCH on the numerous
sensing lines. The ProxSense™ module is a
combination of hardware and software,
based on the principles of charge transfer. A
set of measurements are taken and used for
calculating the touch controller outputs.
30
CxA5
/ Cx Sensor Line / I/O 3.1 Charge Transfer Concepts
GPIO_3
Capacitance measurements are taken with a
31
CxA6
GPIO_6
/ Cx Sensor Line / I/O
charge transfer process that is periodically
initiated. The measuring process is referred
32
CxA7
/ Cx Sensor Line / I/O to as a charge transfer cycle and consists of
GPIO_7
the following:
Copyright © Azoteq (Pty) Ltd 2015
All rights reserved.
IQS316 Datasheet
Revision 1.02
Page 5 of 27
April 2015
5 Page 
IQ Switch®
ProxSense® Series
automatic selection are highlighted in the 4.3 Proximity Output (POUT)
table.
All the individual PROX status for each
Table 4.1 Automatic Shield channel is available through the device
Setting Channels
memory map, but an additional POUT I/O has
Group
0
SHLD_A
CxA0
SHLD_B
CxB0
been added. This I/O is active HIGH when
any of the PROX channels (CH0 – CH3)
sense a PROX. This could, for example, be
1 CxA0
CxB0
used to control the backlighting of an
2 CxA1
CxB1
application.
3 CxA2
CxB2
4.4 Zero Cross Synchronising
4 CxA3
CxB3
When an application is operated in a noisy AC
environment, it could be required to
The active driven shields follow the waveforms synchronise the charging to the AC. This
of the sensor lines. A screenshot of two pairs reduces the noise influence on the count
of shield and sensor lines are illustrated in value. This is not normally required since the
Figure 4.2. It can be seen that generally 2 Prox Mode filters should remove this AC
different channels have very similar signals, component, but is available if needed.
and it has been found that the shield of a
specific channel can be effectively used to
If unused, it is best to connect directly to GND.
shield the other channels in the same timeslot 4.5 Device Sleep
(Group).
The IQS316 can be placed in low power
SLEEP mode. This however is a totally
inactive state, and no channel sensing is
performed. This could be used if an
application does not require the keys to be
sensed, or if custom low power mode is
implemented. All the device settings and data
is retained after waking from the sleep.
4.6 Communication Bypass
The IQS316 can be set up to bypass the
communication window. This could be useful
if a master does not want to be interrupted
during every charging cycle of the IQS316.
Figure 4.2 Active shields
The communication will be resumed (Ready
Pull-up resistors are required on each shield
line as shown in Figure 6.9 and Figure 6.10.
A suggested value for the pull-up resistors are
2kΩ when using the controller at 3.3V, and
4.7kΩ when using the controller at 5V.
Smaller resistor values will increase the
driving ability of the shield, but will also
increase the current consumption.
will indicate available data) if the IQS316
senses a proximity. The master can also
initiate communication if required (only in SPI).
Therefore the master sends a command to
bypass the communication. The IQS316 then
continually does conversions without
interaction with the master, until a proximity
occurs, which is most likely the first time that
the master will be interested in the IQS316
For more information regarding shielding, refer data.
to the application note
Implementation of Driven Shield”.
“AZD009 If the master wants to force the
communication to resume in SPI mode, then
Copyright © Azoteq (Pty) Ltd 2015
All rights reserved.
IQS316 Datasheet
Revision 1.02
Page 11 of 27
April 2015
11 Page | ||
| Páginas | Total 27 Páginas | |
| PDF Descargar | [ Datasheet IQS316.PDF ] | |
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