IQ Switch
®
ProxSense
™
Series
Evaluation Kit: User Manual
IQ Switch
®
- ProxSense
TM
Series
IQS127 EV-Kit User Manual
Table of Content
1
2
3
4
5
INTRODUCTION............................................................................................................................................. 1
MOTHERBOARD ............................................................................................................................................ 1
SQUARE DAUGHTER BOARD ......................................................................................................................... 3
ROUND DAUGHTER BOARD .......................................................................................................................... 5
PROGRAMMING & STREAMING .................................................................................................................... 6
1 Introduction
This user manual describes the IQS127
evaluation kit. The EV-kit is made in two
parts, consisting of a mother board and
separate plug-in boards. It is developed to
facilitate
application
engineers
and
development engineers in evaluating the
IQS127 capacitive proximity and touch
sensor. LEDs are used to display the
output of the device. The design of the EV-
kit allows for flexibility, allowing the user to
use the IQS127 in direct mode, streaming
mode to a PC, or use the small plug-in
boards in an application circuit.
2 Motherboard
Figure 2.1 shows the top view of the EV-kit
mother board. Its features include:
Battery powered; or
USB powered
15mm Diameter button
Back-grid as Shield
Back-grid as Ground
Back-grid as Sense Plate
Slide switch for programming or
streaming selection (See Figure 2.3).
Figure 2.1
Copyright © Azoteq (Pty) Ltd 2010.
All Rights Reserved.
Top-View of EV-kit mother board.
Evaluation Kit: User
Manual
Revision 1.0.2
Page 1 of 7
November 2010
IQ Switch
®
ProxSense
™
Series
Figure 2.2
Box header for Streaming/Programming.
The mother board includes a box header
for programming and streaming the IQS127
devices through Azoteq configuration tools
(CTxxx) to a PC, as well as two jumpers:
W1 – for measuring current
W2 – for back-grid selection
Figure 2.3 shows the bottom view of the
mother board. The daughter boards are
powered by two 3V coin cell batteries, in
series, which is regulated on the mother
board to 4.5V. A ground pin and mini USB
connector is also available to connect and
review the effect of introducing larger
ground references.
.
Figure 2.3
Bottom view of mother board.
Copyright © Azoteq (Pty) Ltd 2010.
All Rights Reserved.
Evaluation Kit: User
Manual
Revision 1.0.2
Page 2 of 7
November 2010
IQ Switch
®
ProxSense
™
Series
3 Square Daughter Board
Figure 3.1 shows the top view of the
square daughter board. Its features
include:
Prox LED
Touch LED
Small PCB layout, 10.7mm x 10.7mm
Three possible assemblies:
Dual mode (D)
Shield mode (S)
Streaming mode (STRM)
Indicated by ink marking on
PCB
Figure 3.1
Top view of square daughter board. When looking from the top,
IC and PCB pins are mapped one-to-one.
GND (pin 2) and a sense plate (pin 6) from
the application to the square daughter
board. This allows the IQS127 to be tested
in existing applications.
Figure 3.2 shows the bottom view of the
square daughter board. Descriptions of the
components are given in Table 3.1. The
square daughter board can be wired into
applications, by connecting VDDHI (pin 5),
Copyright © Azoteq (Pty) Ltd 2010.
All Rights Reserved.
Evaluation Kit: User
Manual
Revision 1.0.2
Page 3 of 7
November 2010
IQ Switch
®
ProxSense
™
Series
Table 3.1
Square daughter board component descriptions.
Component
Use
Typical
Value
C1,C3
1
C2,C4
1
R1 & R2
R3
R4
Power
Supply 1uF,
decoupling capacitor
100pF
1
Internal
regulator 1uF,
decoupling capacitor
100pF
1
LED current
resistor
limiting 2k
CX
series
resistor 2k
(Added ESD protection)
Shield Pull-up resistor 10k
(only for IQS127S)
Figure 3.2
Bottom view of square daughter board.
1
Used for added RF immunity in extreme environments (GSM band)
Evaluation Kit: User
Manual
Revision 1.0.2
Page 4 of 7
November 2010
Copyright © Azoteq (Pty) Ltd 2010.
All Rights Reserved.
IQ Switch
®
ProxSense
™
Series
4 Round Daughter Board
Figure 4.1 shows the top view of the round
daughter board. Its features include:
Bi-colour Prox and Touch LED
Button on board
Backlighting through the button
Two possible assemblies:
Dual Mode
Streaming Mode
Figure 4.1
Top view of round daughter board.
button and output LEDs mounted on the
PCB already. To program the round
daughter board through the mother board,
R3 (2k) should be moved to R4 footprint.
R4 should also be placed instead of R3, to
connect larger/different sense plates to the
IQS127 (pin 6).
Figure 4.2 shows the bottom view of the
round
daughter
board.
Component
descriptions are given in Table 4.1. The
round daughter board makes it extremely
easy to wire the IQS127 into existing
applications for testing. It needs only
VDDHI (pin 5) and GND (pin 2), as it has a
Table 4.1
Component descriptions for round daughter board.
Component
C1,C3
2
C2,C4
2
R1 & R2
R3 or R4
DS1
Use
Power Supply
decoupling capacitor
Internal regulator
decoupling capacitor
LED current limiting
resistor
CX selection resistor
(Added ESD protection)
Bi-colour LED
Typical
Value
1uF,
100pF
2
1uF,
100pF
2
2k
2k
N/A
2
Used for added RF immunity in extreme environments (GSM band)
Evaluation Kit: User
Manual
Revision 1.0.2
Page 5 of 7
November 2010
Copyright © Azoteq (Pty) Ltd 2010.
All Rights Reserved.
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