Azoteq IQ Switch ProxSense IQS231EV02 Manuale utente

IQ Switch®

ProxSense®Series

IQS231EV02 Quick start guide

Page 1 of 3

Revision 1.0

August 2015

IQS231EV02 Quick start guide

Single Channel Capacitive Proximity/Touch/SAR Controller with movement detection

The IQS231ProxSense®IC is a self-capacitance controller designed for SAR applications

where a reliable proximity detection function is required along with human and inanimate

object distinction. The IQS231 uses quick release and movement detection to achieve this.

The IQS231 operates standalone or I2C can be configured via OTP (One Time

Programmable) bits.

1 Reference design and pin layout

Figure 1.1 IQS231EV02

Figure 1.2 TSOT23-6 Pin layout

Table 1.1 Multifunction pin descriptions

IQS231 in TSOT23-6

Name

Type

Function

PRIMARY I/O

Digital Input/Output

Multifunction IO1 / SCL (I2C Clock signal)

VSS

Signal GND

SECONDARY

I/O / Tx

Digital Input/Output

Multifunction IO2 / SDA (I2C Data output)

/ Tx

VREG

Regulator output

Requires external capacitor

VDDHI

Supply Input

Supply:1.75V –3.6V

Sense electrode

Connect to conductive area intended for

sensor

Table 1.2 Pin-out description

Multifunction pin name

Multifunction pin option

IO1

Proximity output / Proximity output with heartbeat

IO2

Sensitivity input / Synchronization input /

Movement output / Touch output

IQS

231

IO1 / SCL

VSS

IO2 / SDA / Tx

Cx / Rx

VDDHI

VREG

IQ Switch®

ProxSense®Series

IQS231EV02 Quick start guide

Page 2 of 3

Revision 1.0

August 2015

Figure 1.3 Reference design

2 Default UI

Figure 2.1 Proximity UI no movement

GND

1uF

GND

100pF

1uF

GND

VDDHI

GND

VIN

VDDHI

GND

470R

GND

VDDHI

Configure these resistors for IQS231 I2C operation.

PIN3: IQS231 SDA Pull-up

PIN1: IQS231 SCL Pull-up

4.7K

VDDHI

SEC/SDA

GND

IO1/SCL

IO2/SDA/TX

Optional: LED and current limiting resistor

PIN1: Output LED and current limiting resistor

on primary output

VDDHI

1.0K

DS1

BLUE

PRIM/SCL

IO1/SCL IO1/SCL

IO1/SCL

IO2/SDA/TX

10pF

GND

LK1

2W-SLink Open

IO2/SDA/TX

IO1/SCL

VREG

CX/RX

VSS

VDDHI

IQS231

Option: Sensitivity input

GND for more sensitivity

POR

Hand held detect

Proximity Active

Quick release

active &

Proximity Active

Filter halt

Idle

Prox clear

Redo ATI

Prox active

ATI error

Prox active

Proximity Active

QR detect

Prox detect

5sec !Mov

2sec !Mov

Normal

prox

release

5sec

no prox

HH detect

enabled

Reference (LTA)

out-of-bounds

POR auto-ATI

calibration

complete

No calibration

convergence

10 sec

time-out

Mov

detect

5sec

!Mov

Disable HH

detect

IQ Switch®

ProxSense®Series

IQS231EV02 Quick start guide

Page 3 of 3

Revision 1.0

August 2015

Figure 2.2 IQS231 GUI

Different UI’s can be selected in the IQS231 GUI and can then be selected to run in

standalone mode.

The GUI is available for download from the Software & Tools section of azoteq.com and the

CT210 (sold separately) is used in conjunction with the GUI to select the different UI’s and

settings.

Using USBProg the IQS231 can be configured in different variations. Please note when

settings are programmed it is permanent.

X-ON Electronics

Largest Supplier of Electrical and Electronic Components

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