IQS360 datasheet(19/53 Pages) ETC2

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IQ Switch

ProxSense

® Series

IQS360 Datasheet

Page 19 of 53

Revision 1.10

October 2015



CS_SIZE

1: Size of sampling capacitor.



PROJ_BIAS bits: Adjusts the biasing of

some analogue parameters in the

mutual capacitive operated IC. (Only

applicable in mutual capacitance

mode.)



MULTIPLIER bits.

The base value used for the ATI function

can be implemented in 2 ways:

1. ATI_PARTIAL = 0. ATI automatically

adjusts MULTIPLIER bits to reach a

selected base value

2. Please refer

to Section 5.8 for available base

values.

2. ATI_PARTIAL = 1. The designer can

specify the multiplier settings. These

settings will give a custom base

value from where the compensation

bits

will

automatically

implemented to reach the required

target value. The base value is

determined by two sets of multiplier

bits. Sensitivity Multipliers which will

also scale the compensation to

normalise

the

sensitivity

and

Compensation Multipliers to adjust

the gain.

6.6.5 Re-ATI

An automatic re-ATI event will occur if the

CS is outside its re-ATI limits and no event

is present on the applicable channel. The

re-ATI limit or ATI boundary is calculated

as the target value divided by 8. For

example:

Target = 512, Re-ATI will occur if CS is

outside 512±64.

A re-ATI event can also be issued by the

host MCU by setting the REDO_ATI bit in

0x08,

Settings

byte

The

Changing CS_SIZE if ATI_OFF = 0 will change CS

ATI

function

will

use

user

selected

CS_SIZE

and

PROJ_BIAS

(if

applicable)

and

will

only

adjust

the

MULTIPLIER bits to reach the base values.

REDO_ATI bit will clear automatically after

the ATI event was started.

Note: Re-ATI will automatically clear all

proximity, touch, snap and halt status bits.

6.6.6 Reseed

Setting the Reseed bit in Register 0x08,

Settings byte 0, will reseed all LTA filters to

a value of LTAnew = CS + 8. The LTA will

then track the CS value until they are even.

Performing a reseed action on the LTA

filters, will effectively clear any proximity

and/or touch conditions that may have

been established prior to the reseed call.

6.6.7 ATI Band

The user has the option to select the re-ATI

band as 1/8 of the ATI target (default) or ¼

of the ATI target counts by setting the ATI

BAND

bit

0x08,

byte

(Prox_Settings1).

6.6.8 ATI ERROR

The ATI error bit (read only) in Register

0x01, byte 1 (Sysflags) indicates to the

user

that

the

ATI

targets

where

not

reached. Adjustments of the base values or

ATI BANDs are required.

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