QT1081-ISG Datasheet QT1081-ISG | P4-P6

The QT1081 has two different AKS groupings of keys,

selectable via option resistors. These groupings are:

y AKS operates in two groups of four keys.

y AKS operates over all eight keys.

These two modes allow the designer to provide AKS while

also providing for shift or function operations.

If AKS is disabled, all keys can operate simultaneously.

1.2.11 Outputs

There are two output modes: one-per-key, and binary coded.

One

-per-key output: In this mode there is one output pin per

key. This mode has two output drive options, push-pull and

open-drain. The outputs can also be made either active-high

or active-low. These options are set via external configuration

resistors.

Binary coded output:

In this mode, three output lines encode

for one possible key in detect. If more than one key is

detecting, only the first one touched will be indicated.

1.2.12 Simplified Mode

To reduce the need for option resistors, the simplified

operating mode places the part into fixed settings with only the

AKS feature being selectable. LP mode is also possible in this

configuration. Simplified mode is suitable for most

applications.

lQ 4 QT1081_1R0.04_0307

1.3 Wiring

Table 1.1 Pinlist

OpenOut 7O/ODOUT_732

OpenOut 6O/ODOUT_631

OpenOut 5O/ODOUT_530

OpenOut 4O/ODOUT_429

Open

In binary coded mode, these pins

are clamped internally to Vss

Out 3O/ODOUT_328

Open

Also, binary coded output 2

Out 2O/ODOUT_227

OpenAlso, binary coded output 1Out 1O/ODOUT_126

OpenAlso, binary coded output 0Out 0O/ODOUT_025

OpenActive = any key in detectDetect StatusO/ODDETECT24

Vdd or VssRising edge sync or LP pulseSync In or LP InISYNC/LP

‡

-0VGroundPwrVss22

OpenTo Cs7 + KeySense pinI/OSN7K21

Open or mode resistor

†

or option resistor*

To Cs7 and/or mode resistor

†

or option resistor*

Sense pin and mode

or option select

I/OSNS720

Open or

mode resistor

†

To Cs6 + Key and/or

mode resistor

†

Sense pin and

mode select

I/OSNS6K19

Open or

option resistor*

To Cs6 and/or

option resistor*

Sense pin and

option select

I/OSNS618

OpenTo Cs5 + KeySense pinI/OSNS5K17

Open or

option resistor*

To Cs5 and/or

option resistor*

Sense pin and

option select

I/OSNS516

OpenTo Cs4 + KeySense pinI/OSNS4K15

Open or

option resistor*

To Cs4 and/or

option resistor*

Sense pin and

option select

I/OSNS414

OpenTo Cs3 + KeySense pinI/OSNS3K13

Open or

option resistor*

To Cs3 and/or

option resistor*

Sense pin and

option select

I/OSNS312

OpenTo Cs2 + KeySense pinI/OSNS2K11

Open or

option resistor*

To Cs2 and/or

option resistor*

Sense pin and

option select

I/OSNS210

OpenTo Cs1 + KeySense pinI/OSNS1K9

Open or

option resistor*

To Cs1 and/or

option resistor*

Sense pin and

option select

I/OSNS18

OpenTo Cs0 + KeySense pinI/OSNS0K7

Option resistor

To Cs0 and/or

option resistor

Sense pin and

option select

I/O

SNS06

-Leave open--n/c5

Resistor to Vdd and optional

spread spectrum RC network

OscillatorIOSC4

-+2.8 ~ +5.0VPowerPwrVdd3

VddActive low resetReset inputI/RST2

100K resistor to VssSpread spectrum driveSpread spectrumODSS1

If UnusedNotesFunctionTypeName

32-QFN

Pin Type

I CMOS input only

I/O CMOS I/O

O CMOS push-pull output

OD CMOS open drain output

O/OD CMOS push pull or open-drain output (option selected)

Pwr Power / ground

Notes

†

Mode resistor is required only in Simplified mode (see Figure 1.2)

* Option resistor is required only in Full Options mode (see Figure 1.1)

‡

Pin is either Sync or LP depending on options selected (functions SL_0, SL_1, see Figure 1.1)

lQ 5 QT1081_1R0.04_0307

Figure 1.1 Connection Diagram - Full Options

Table 1.2

AKS / Fast-Detect Options

Table 1.3

Max On-Duration

Table 1.4

Polarity and Output

Table 1.5

SYNC/LP Function

lQ 6 QT1081_1R0.04_0307

SNS3

SNS3K

SNS4

SNS4K

SNS5

SNS5K

SNS6

SNS6K

SNS7

SNS7K

VSS

DETECT

SYNC/LP

SNS2K

SNS2

/RST

OUT_7

OUT_6

OUT_5

OUT_4

OUT_3

OUT_2

OUT_1

OUT_0

10K

1nF

10K

1nF

KEY 2

10K

1nF

OUT_1

OUT_0

DETECT OUT

SYNC or LP IN

OUT_2

OUT_3

OUT_4

OUT_5

OUT_6

OUT_7

QT1081

32-QFN

1nF

Vdd / Vss

POL

MOD_1

OUT_D

SL_0

SL_1

MOD_0

OUT_0

VDD

Vunreg

*4.7uF *4.7uF *100nF

+2.8 ~ +5V

Voltage Reg

VDD

KEY 3

KEY 4

KEY 5

KEY 6

KEY 7

SNS3

SNS4

SNS5

SNS6

SNS7

SNS2

SNS1K

SNS1

10K

1nF

Vdd / Vss

AKS_1

KEY 1

SNS1

SNS0K

SNS0

10K

1nF

Vdd / Vss

AKS_0

KEY 0

SNS0

Vdd Range

Rb1 Rb2

3.6 ~ 5V

2.8 ~ 3.59V 12K 22K

15K 27K

Recommended Rb1, Rb2 Values

OSC

Rb1

Rb2

VDD

The required value of spread-spectrum capacitor CSS

will vary according to the lengths of the acquire bursts,

see Section 3.2. A typical value of is 100nF.CSS

Binary coded

output mode

Keep these parts

close to the IC

Keep these parts

close to the IC

* Note: one bypass capacitor to be tightly wired

between Vdd and Vss. Follow manufacturer’s

recommendations for input and output capacitors.

OffOn, globalVddVdd

OffOn, in 2 groupsVssVdd

EnabledOffVddVss

OffOffVssVss

FAST-DETECTAKS MODEAKS_0AKS_1

(reserved)VddVdd

Infinite (disabled)VssVdd

60 seconds (nom) to recalibrateVddVss

10 seconds (nom) to recalibrateVssVss

MAX ON-DURATION MODEMOD_0MOD_1

One-per-key, active low, push-pullVddVdd

One-per-key, active high, push-pullVssVdd

One-per-key, active low, open-drainVddVss

Binary coded, active high, push-pullVssVss

OUT_n, DETECT PIN MODEPOLOUT_D

LP mode: 340ms nom response timeVddVdd

LP mode: 180ms nom response timeVssVdd

LP mode: 100ms nom response timeVddVss

SyncVssVss

SYNC/LP PIN MODESL_0SL_1

P1-P3 P4-P6 P7-P9 P10-P12 P13-P15 P16-P18 P19-P20

QT1081-ISG

Mfr. #:

Buy QT1081-ISG

Manufacturer:

Description:

SENSOR IC QTOUCH 8 KEY 32QFN

Lifecycle:

New from this manufacturer.

Delivery:

DHL FedEx Ups TNT EMS

Payment:

T/T Paypal Visa MoneyGram Western Union

Products related to this Datasheet

QT1081-ISG