IQ Switch
®
ProxSense
™
Series
Copyright © Azoteq (Pty) Ltd 2010.
Evaluation Kit: User
Manual
Page 5 of 7
All Rights Reserved.
Revision 1.0.2
November 2010
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.
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
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).
Table 4.1
Component descriptions for round daughter board.
Component
Use
Typical
Value
C1,C3
2
Power Supply
decoupling capacitor
1uF,
100pF
2
C2,C4
2
Internal regulator
decoupling capacitor
1uF,
100pF
2
R1 & R2
LED current limiting
resistor
2k
R3 or R4
CX selection resistor
(Added ESD protection)
2k
DS1
Bi-colour LED
N/A
2
Used for added RF immunity in extreme environments (GSM band)
