IQ Switch
®
ProxSense
®
Series
IQS213/A Datasheet
IQSwitch
®
- ProxSense
®
Series
3-Channel Capacitive Touch/Swipe Function Controller
Overview
Unparalleled Features
Sub 5µA* current consumption (“Zero-Power” electronic switch).
Internal Capacitor Implementation
(ICI) – Reference capacitor on-chip
Automatic Tuning Implementation
(ATI) - Automatic tuning for optimal operation in various
environments & compensation against sensitivity reducing objects
IQS213A advised for applications with high load-capacitances and high sensitivity
requirements.
The
IQS213(A)
ProxSense
®
IC is a fully integrated two or three channel capacitive swipe function
sensor with market leading sensitivity and automatic tuning of the sense electrodes. The
IQS213(A)
provides a minimalist implementation requiring few external components, with OTP-
option settings and an I
2
C-compatible interface that allow configuration for numerous applications.
Main Features
2 or 3 Channel (Projected or Self Capacitance) Input device
Swipe Function or Differentiated Touch and Distributed Proximity Electrode Implementation
Variable User Interface with Adjustable Swipe Function Configuration
Auto-Off and Advanced Auto-Off Warning Function
Supply voltage: 1.8V to 3.6V
Internal voltage regulator and reference capacitor
Advanced on-chip digital signal processing
OTP (One Time Programmable) options available
2
I C compatible interface
Low Power Modes (sub 4µA*)
Variable Proximity & Touch Thresholds
Small outline MSOP-10 package
Sanitary ware, toys, office equipment
Flashlights, headlamps, keychain lights
Splash- / waterproof devices
Swipe-to-Unlock / Wake from Standby applications
Replacement for electro-mechanical
switches
Applications
Advantages
Prevents accidental activation of conventional touch sensors
Improved digital filtering to reduce external noise
High immunity against aqueous substances
2
Highly adjustable device with continuous data or event driven I C communication
Available options
T
A
-40°C to 85°C
MSOP10
IQS213A / IQS213
*
Current consumption dependant on selected Low Power settings.
Copyright © Azoteq (Pty) Ltd 2011
All Rights Reserved
IQS213A (IQS213) Datasheet
Revision 2.1
Page 1 of 46
March 2014
IQ Switch
®
ProxSense
®
Series
Contents
OVERVIEW .......................................................... 1
1
2
3
4
FUNCTIONAL OVERVIEW .......................... 3
1.1
A
PPLICABILITY
............................................... 3
ANALOGUE FUNCTIONALITY ................... 3
DIGITAL FUNCTIONALITY ......................... 3
HARDWARE CONFIGURATION ................. 4
4.1
IQS213A (IQS213) - MSOP10 P
IN
-O
UT
....... 4
4.2
R
EFERENCE
D
ESIGN
...................................... 5
4.2.2 Power Supply and PCB Layout .............. 5
4.2.3 Design Rules for Harsh EMC
Environments ...................................................... 6
4.2.4 High Sensitivity ....................................... 6
8.3
S
ELF
-
OR
P
ROJECTED
C
APACITANCE
............. 26
8.4
R
ATE OF
C
HARGE
C
YCLES
............................ 27
8.4.1 Normal Power rate ................................ 27
8.4.2 Low Power rates ................................... 27
8.5
T
OUCH
R
EPORT
R
ATE
.................................. 27
8.6
A
CTIVE CHANNELS
....................................... 27
8.7
L
ONG
T
ERM
A
VERAGE
(LTA) ........................ 28
8.8
D
ETERMINE
T
OUCH OR
P
ROX
........................ 28
8.9
ATI ............................................................ 28
8.9.1 ATI Sensitivity ....................................... 28
8.9.2 ATI Target............................................. 28
8.9.3 ATI Base (MULTIPLIER) ...................... 28
8.9.4 Re-ATI .................................................. 29
8.10
RF D
ETECTION
............................................ 29
8.10.1
RF detector sensitivity ...................... 29
9
COMMUNICATION .................................... 30
9.1
E
VENT
M
ODE
.............................................. 30
2
9.2
I C S
PECIFIC COMMANDS
.............................. 30
9.2.1 IC Reset indication ............................... 30
9.2.2 WDT ..................................................... 30
2
9.3
I C R
EAD AND
W
RITE SPECIFICS
................... 30
5
USER CONFIGURABLE OPTIONS ............ 7
5.1
C
ONFIGURING OF
D
EVICES
............................. 7
5.2
U
SER
S
ELECTABLE
C
ONFIGURATION
O
PTIONS
.. 8
5.3
IQS213A (IQS213) S
ETUP
E
XAMPLES
......... 14
5.3.1 Example 1: 3-Channel Self Capacitive,
Active Low Logic Output, SwipeSwitch with
Auxiliary Touch Output. ..................................... 14
5.3.2 Example 2: 3-Channel Projected
Capacitive, Active High Logic Output,
SwipeSwitch with Auxiliary Swipe Pulse Output. 15
5.3.3 Example 3: Normal Mode Operation .... 16
10
IQS213A (IQS213) MEMORY MAP .......... 31
10.1
M
EMORY
R
EGISTERS
................................... 31
10.2
M
EMORY
R
EGISTERS
D
ESCRIPTION
............... 33
10.2.1
Device Information ........................... 33
10.2.2
Device Specific Data ........................ 34
10.2.3
Current Sample (CS) or Count Data. 35
10.2.4
Device Settings ................................ 37
6
DESCRIPTION OF USER SELECTABLE
OPTIONS ............................................................18
6.1
IQS213A (IQS213) IC T
YPE
....................... 18
6.2
S
ELF
- / P
ROJECTED
C
APACITANCE
................ 18
6.2.1 Capacitive Sense Electrode Design
Samples ............................................................ 19
6.3
F
LOAT
R
X
................................................... 19
6.4
O
UTPUT
L
OGIC
S
ELECT
................................ 19
6.5
H
ALT
T
IME
.................................................. 20
6.6
L
OW
P
OWER
M
ODES
................................... 20
6.7
P
ROXIMITY
T
HRESHOLD
............................... 21
6.8
T
OUCH
T
HRESHOLDS
................................... 21
6.9
IQS213A (IQS213) SWIPE UI ................... 22
6.10
Z
ERO
S
TATES
A
LLOWED
.............................. 22
6.11
E
ND ON
Z
ERO
S
TATE
................................... 22
6.12
S
TATE
T
IMES
.............................................. 22
6.12.1
Minimum State Time ........................ 22
6.12.2
Maximum State Time ....................... 23
6.12.3
Overall State Time ........................... 23
6.13
T
OUCH
/S
WIPE
(P
IN
7) O
UTPUT
...................... 23
6.14
AC F
ILTER
.................................................. 23
6.15
ATI M
ETHOD
............................................... 23
6.16
B
ASE
V
ALUE
............................................... 23
6.17
ATI T
ARGET
V
ALUE
..................................... 23
6.18
A
UTO
-O
FF
/ A
DVANCED
A
UTO
-O
FF
W
ARNING
24
6.18.1
Advanced Auto-Off Warning (AAOW)
24
6.18.2
AAOW Clear / Reset ........................ 24
2
6.19
I C D
EBUG
................................................. 24
11 ELECTRICAL SPECIFICATIONS – ALL
PRELIMINARY .................................................. 40
11.1
11.2
25°C)
11.3
A
BSOLUTE
M
AXIMUM
S
PECIFICATIONS
........... 40
G
ENERAL
C
HARACTERISTICS
(M
EASURED AT
40
T
IMING
C
HARACTERISTICS
............................ 42
12
PACKAGING INFORMATION................... 43
F
IGURE
12.1 MSOP-10 B
ACK VIEW
. .......................... 43
F
IGURE
12.2 MSOP-10 S
IDE VIEW
. ........................... 43
F
IGURE
12.3 MSOP-10 T
OP VIEW
. ............................ 43
F
IGURE
12.4 MSOP-10 F
OOTPRINT
. ......................... 43
13
DEVICE MARKING ................................... 44
T
OP MARKING
.............................................. 44
B
OTTOM
M
ARKING
....................................... 44
13.1
13.2
14
15
ORDERING INFORMATION ..................... 45
G
ENERAL
P
ART
O
RDER
N
UMBER
.................. 45
14.1
CONTACT INFORMATION ....................... 46
7
ADDITIONAL FEATURES .........................24
7.1
N
OISE
D
ETECTION
....................................... 24
7.1.1 Notes for layout: ................................... 24
8
PROXSENSE MODULE ...........................26
8.1
8.2
C
HARGE
T
RANSFER
C
ONCEPTS
.................... 26
®
P
ROX
S
ENSE
M
ODULE
S
ETUP
...................... 26
IQS213A (IQS213) Datasheet
Revision 2.1
Page 2 of 46
March 2014
®
Copyright © Azoteq (Pty) Ltd 2011
All Rights Reserved
IQ Switch
®
ProxSense
®
Series
1 Functional Overview
The
IQS213A (IQS213)
is a two or three
channel capacitive proximity and touch
sensor with variable swipe function
configurations. Additional features include
internal voltage regulation and reference
capacitor (C
S
), which enables cost efficient
and minimal component designs. The device
offers flexible design approaches by allowing
the connection of two or three sense
antennas in either surface or projected
capacitance configurations.
For swipe function applications the device
has a single logic output to indicate swipe
actions and one complementary output for
consecutive swipe/touch activities.
The
device can also be configured to operate with
individual touch outputs, with an additional
proximity output when implementing surface
capacitance sense electrodes.
Full control by a master device is achieved by
configuring the logic outputs in a serial data
(I
2
C) communication option on TO0 (SCL),
TO1 (SDA) and TO2 (RDY).
The device automatically tracks slow varying
environmental changes via various filters,
detects noise and has an Automatic Tuning
Implementation (ATI) to tune the device for
optimal sensitivity.
by the digital circuitry. For projected-
capacitance configurations the capacitance is
measured between the transmit (TX) and
receive (CRX) pins. The measuring process
is referred to as a conversion and consists of
the discharging of C
S
and C
X
, the charging of
C
X
and then a series of charge transfers from
C
X
to C
S
until a trip voltage is reached. The
number of charge transfers required to reach
the trip voltage is referred to as the Count
(CS) Value.
The capacitance measurement circuitry
makes use of an internal C
S
and voltage
reference (V
REG
).
The analogue circuitry further provides
functionality for:
Power on reset (POR) detection.
Brown out detection (BOD).
3 Digital Functionality
The digital processing
responsible for:
functionality
is
1.1 Applicability
All specifications, except where specifically
mentioned otherwise, provided by this
datasheet are applicable to the following
ranges:
Temperature: -40°C to +85°C
Supply voltage (V
DDHI
): 1.8V to 3.6V
Device setup from OTP settings after
POR.
Management of BOD and WDT
events.
Initiation of conversions at the
selected rate.
Processing of CS and execution of
algorithms.
Monitoring and automatic execution of
the ATI algorithm.
Signal processing and digital filtering.
Detection of PROX and TOUCH
events.
Managing outputs of the device.
Managing serial communications.
Manage
programming
of
OTP
options.
2 Analogue Functionality
For self-capacitance configured sense
electrodes the analogue circuitry measures
the capacitance of the sense antennas
attached to the C
X
pins through a charge
transfer process that is periodically initiated
Copyright © Azoteq (Pty) Ltd 2011
All Rights Reserved
IQS213A (IQS213) Datasheet
Revision 2.1
Page 3 of 46
March 2014
IQ Switch
®
ProxSense
®
Series
4 Hardware Configuration
4.1
IQS213A (IQS213) - MSOP10 Pin-Out
Figure 4.1 : Pin-out of IQS213 Surface package
Table 4.1 : IQS213 Pin-out
Pin
1
2
3
4
5
6
7
8
9
10
Name
GND
CX0 (CRX0)
CX1 (CRX1)
VDDHI
VREG
SWIPE/TO2/RDY
PULSE/T01/SDA
AAOW/TO0/SCL
CX2 (CRX2)
PO/TX
IQS213 Pin-out
Type
Function
Supply Input
Ground Reference
Analogue
Sense Electrode 0
Analogue
Sense Electrode 1
Supply Input
Supply Voltage Input
Internal Regulator Pin
(Connect 1µF
Analogue Output
bypass capacitor)
Digital Output
Digital Output
Digital I/O
Analogue
Digital Output
Transmitter
Swipe Output/Touch Output/I
2
C:
RDY Output
Pulse Output/Touch Output/I
2
C:
SDA Output
Auto-Off Warning/Touch
Output/I
2
C: SCL Input
Sense Electrode 2
/ Proximity Output/ Projected Sense
Electrode
Copyright © Azoteq (Pty) Ltd 2011
All Rights Reserved
IQS213A (IQS213) Datasheet
Revision 2.1
Page 4 of 46
March 2014
IQ Switch
®
ProxSense
®
Series
4.2 Reference Design (
IQS213A, Self-Capacitance, Active-Low Output
)
*For IQS213, use C3 = 470nF.
Figure 4.2 : IQS213A Reference Design (Self-Capacitance, Active-Low)
4.2.2 Power Supply and PCB Layout
Azoteq IC's provide a high level of on-chip hardware and software noise filtering and ESD
protection (refer to application note “AZD013
– ESD Overview”).
Designing PCB's with better
noise immunity against EMI, FTB and ESD in mind, it is always advisable to keep the critical noise
suppression components like the de-coupling capacitors and series resistors in
Figure 4.2
as close
as possible to the IC. Always maintain a good ground connection and ground pour underneath the
IC. For more guidelines please refer to the relevant application notes as mentioned in
Section
4.2.3.
Copyright © Azoteq (Pty) Ltd 2011
All Rights Reserved
IQS213A (IQS213) Datasheet
Revision 2.1
Page 5 of 46
March 2014
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