IQS360 datasheet(13/53 Pages) ETC2

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IQ Switch

ProxSense

® Series

IQS360 Datasheet

Page 13 of 53

Revision 1.10

October 2015

value deviation below the Long-Term

Average of the channel on a snap.



The conductive dome must however not

be too big relative to the pitch of the

Rx/Tx sensors, so as to not block the

field lines for the trackpad sensing.



No electrical connection between the

snap-dome and the Rx-Tx must be

made. Usually PCB solder-mask is

adequate. Optimally the sensors are

covered by solder-mask, with the snap-

dome directly above.



The snap-dome overlay must not have

varying air-gaps between itself and the

sensors.

Thus

having

the

overlay

securely fastened to the PCB is ideal. A

variable

air-gap

causes

sporadic

sensing, and gives unreliable data.

5.12 Block 7/5

When using the Reject Touches option

(see Section 5.13), the IQS360 has the

option to set the Block Event on 7 and

more touches instead of 5 or more touches,

by setting the Block 7/5 bit in Register

0x08, Settings byte 3. This feature is

typically used in 4x3 applications, where

the trackpad area is small.

5.13 Reject Touches

When Reject Touches is activated in

will set the block event flag in Register

0x01, byte1 if more than 5 (or 7 depending

on the Block setup) touches is detected at

one time. This allows the user to decide if

XY-data will be used, as 5 or more touches

will be present on the grid, which is often

the result of a flat user finger.

5.14 RX on Multiple

The IQS360 Trackpad charges in Projected

Capacitive mode. The proximity channel

(CH0

will,

however,

charge

Self

capacitive mode. By default, the IQS360

will only charge CTRX3 (Rx3) for CH0. It is

possible to set the IQS360 to charge all 4

Rx lines as one distributed Self Capacitive

Electrode. This is achieved by setting the

Rx Multiple bit in Register 0x08, Settings

byte 3.

5.15 Prox Projected

The proximity channel on the IQS360 CH0

can be changed to charge in projected

capacitive mode

1. This is achieved by

setting the “Prox Proj” bit in Register 0x08,

Settings byte 1 (Prox_Settings1). Projected

proximity sensing can be used with a single

Rx or all Rx electrodes. Single Rx is

recommended

for

3x3

trackpads,

with

proximity ring around the trackpad. For

improved distance, a GND ring can be

placed between the Rx ring and trackpad

diamonds on the PCB layout. Rx on

Multiple is recommended for 3x4 trackpads.

5.16 Force Sleep

The IQS360 can be set to hibernate

2, or go

back to low power mode at any time, even

if touches are still present, by setting the

Force Sleep bit in Register 0x08, Settings

byte 1 (Prox_Settings1). This will reseed

CH0, and the IQS360 will go into low

power, and wake up with movement in the

counts larger than the proximity threshold

in any direction.

This mode allows the master to put the

device into a low power state even if a user

finger is still on the trackpad. If a stationary

XY point is sensed by the master, such as

a user resting his finger on the trackpad for

a certain length of time a command is then

sent by the master to the device to enter

hibernation.

If for any reason the master wants to

cancel the Touch Hibernate mode, then it

must perform a ‘force comms’ similar to the

way it does it in EVENT_MODE, by

performing a RDY handshake.

5.17 Relative Data

By default the IQS360 will output Trackpad

data as absolute XY-coordinates. It is

possible to change this output to Relative

Coordinates, but setting the Relative Coord

bit in Register 0x08, Settings byte 3.

1 QFN32 devices only

2 QFN32 devices only

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