QT110A-ISG

QT110A-ISG Datasheet

QT110A-ISG

Part	Datasheet
QT110A-ISG	QT110A-ISG (pdf)

PDF Datasheet Preview
QT110A-ISG NOT RECOMMENDED FOR NEW DESIGNS Less expensive than many mechanical switches Projects a ‘touch button’ through any dielectric 100% autocal for life - no adjustments required No active external components Piezo sounder direct drive for ‘tactile’ click feedback LED drive for visual feedback 2 ~ 5V single supply operation 10µA at 2.5V - very low power drain Toggle mode for on/off control via option pins 10s or 60s auto-recalibration timeout via option pins Pulse output mode via option pins Gain settings in 3 discrete levels Simple 2-wire operation possible HeartBeat health indicator on output Pb-Free packages Vdd 1 Out 2 Opt1 3 Opt2 4 QT110A 8 Vss 7 Sns2 6 Sns1 5 Gain The QT110A is a Flash version of the QT110. The QT110A is form, fit and function compatible with the older device, except that the QT110A is more sensitive than the older device, necessitating a significant reduction in Cs capacitance. See Section 1 on page 2 for differences. This device is intended as a replacement for the QT110, and is not recommended for new designs. For further device migration plans please consult your local Atmel or Quantum representative. 1999-2008 Quantum Research Group QT110A_1R0.01_0408 1 - OVERVIEW Figure 1-1 Standard mode options The QT110A is intended to replace the QT110 as a lower cost alternative. This device functions identically to the QT110, except that it is more sensitive. To compensate for the sensitivity increase, it is required to do either of these two things: Increase the Cx loading to ground on SNS2 by 10pF Decrease the Cs value SNS2 SENSING ELECTRODE Option 1 is very simple and guarantees that the sensitivity of the QT110A is identical to the older device. Option 2 requires some trial and error to test the sensitivity of the touch pad or OPT1 GAIN Cs Rs prox field, so that it is about the same as before. Cs changes ranging from 10 to 60% may be required depending on the circuit layout and electrode design. All other aspects of this datasheet are identical to the QT110 OPT2 SNS1 OUTPUT = DC 2nF - 500nF TIMEOUT = 10 Secs TOGGLE = OFF GAIN = HIGH datasheet except for this section, the specification changes on pages 8 and 9, and the part marking. Option pins allow the selection or alteration of several other BASIC OPERATION special features and sensitivity. The QT110A employs low duty cycle bursts of charge-transfer cycles to acquire its signal. Burst mode permits power ELECTRODE DRIVE consumption in the low microamp range, dramatically reduces EMC problems, and yet permits excellent response time. Internally the signals are digitally processed to reject impulse noise, using a 'consensus' filter which requires four consecutive confirmations of a detection before the output is activated. The internal ADC treats Cs as a floating transfer capacitor as a direct result, the sense electrode can in theory be connected to either SNS1 or SNS2 with no performance difference. However, the noise immunity of the device is improved by connecting the electrode to SNS2, preferably via a series resistor Re Figure 1-1 to roll off higher harmonic frequencies, The QT switches and charge measurement hardware functions both outbound and inbound. 5 - ORDERING INFORMATION PART QT110A-ISG TEMP RANGE -40 - 85C PACKAGE SOIC-8 Lead-Free MARKING Microchip markings QT110A_1R0.01_0408 Copyright 1999-2008 QRG Ltd. All rights reserved Patented and patents pending Corporate Headquarters 1 Mitchell Point Ensign Way, Hamble SO31 4RF Great Britain Tel +44 0 23 8056 5600 Fax +44 0 23 8045 3939 This device covered under one or more of the following United States and international patents 5,730,165, 6,288,707, 6,377,009, 6,452,514, 6,457,355, 6,466,036, Numerous further patents are pending which may apply to this device or the applications thereof. The specifications set out in this document are subject to change without notice. All products sold and services supplied by QRG are subject to our Terms and Conditions of sale and supply of services which are available online at and are supplied with every order acknowledgement. QProx, QTouch, QMatrix, QLevel, and QSlide are trademarks of QRG. QRG products are not suitable for medical including lifesaving equipment , safety or mission critical applications or other similar purposes. Except as expressly set out in QRG's Terms and Conditions, no licenses to patents or other intellectual property of QRG express or implied are granted by QRG in connection with the sale of QRG products or provision of QRG services. QRG will not be liable for customer product design and customers are entirely responsible for their products and applications which incorporate QRG's products.

PDF Datasheet Preview

QT110A-ISG

NOT RECOMMENDED FOR NEW DESIGNS

Less expensive than many mechanical switches Projects a ‘touch button’ through any dielectric 100% autocal for life - no adjustments required No active external components Piezo sounder direct drive for ‘tactile’ click feedback LED drive for visual feedback 2 ~ 5V single supply operation 10µA at 2.5V - very low power drain Toggle mode for on/off control via option pins 10s or 60s auto-recalibration timeout via option pins Pulse output mode via option pins Gain settings in 3 discrete levels Simple 2-wire operation possible HeartBeat health indicator on output Pb-Free packages

Vdd 1 Out 2 Opt1 3 Opt2 4

QT110A
8 Vss 7 Sns2 6 Sns1 5 Gain

The QT110A is a Flash version of the QT110. The QT110A is form, fit and function compatible with the older device, except that the QT110A is more sensitive than the
older device, necessitating a significant reduction in Cs capacitance. See Section 1 on page 2 for differences.

This device is intended as a replacement for the QT110, and is not recommended for new designs.

For further device migration plans please consult your local Atmel or Quantum representative.
1999-2008 Quantum Research Group

QT110A_1R0.01_0408
1 - OVERVIEW

Figure 1-1 Standard mode options

The QT110A is intended to replace the QT110 as a lower cost alternative. This device functions identically to the QT110, except that it is more sensitive. To compensate for the sensitivity increase, it is required to do either of these two things:

Increase the Cx loading to ground on SNS2 by 10pF Decrease the Cs value

SNS2

SENSING ELECTRODE

Option 1 is very simple and guarantees that the sensitivity of the QT110A is identical to the older device. Option 2 requires some trial and error to test the sensitivity of the touch pad or

OPT1

GAIN

Cs Rs
prox field, so that it is about the same as before. Cs changes ranging from 10 to 60% may be required depending on the circuit layout and electrode design.

All other aspects of this datasheet are identical to the QT110

OPT2

SNS1

OUTPUT = DC
2nF - 500nF

TIMEOUT = 10 Secs TOGGLE = OFF

GAIN = HIGH
datasheet except for this section, the specification changes on
pages 8 and 9, and the part marking.

Option pins allow the selection or alteration of several other

BASIC OPERATION
special features and sensitivity.

The QT110A employs low duty cycle bursts of charge-transfer
cycles to acquire its signal. Burst mode permits power

ELECTRODE DRIVE
consumption in the low microamp range, dramatically reduces EMC problems, and yet permits excellent response time. Internally the signals are digitally processed to reject impulse noise, using a 'consensus' filter which requires four consecutive confirmations of a detection before the output is activated.

The internal ADC treats Cs as a floating transfer capacitor as a direct result, the sense electrode can in theory be connected to either SNS1 or SNS2 with no performance difference. However, the noise immunity of the device is improved by connecting the electrode to SNS2, preferably via a series resistor Re Figure 1-1 to roll off higher harmonic frequencies,

The QT switches and charge measurement hardware functions both outbound and inbound.
5 - ORDERING INFORMATION

PART QT110A-ISG

TEMP RANGE -40 - 85C

PACKAGE

SOIC-8 Lead-Free

MARKING

Microchip markings

QT110A_1R0.01_0408

Copyright 1999-2008 QRG Ltd. All rights reserved Patented and patents pending

Corporate Headquarters
1 Mitchell Point Ensign Way, Hamble SO31 4RF

Great Britain Tel +44 0 23 8056 5600 Fax +44 0 23 8045 3939

This device covered under one or more of the following United States and international patents 5,730,165, 6,288,707, 6,377,009, 6,452,514, 6,457,355, 6,466,036, Numerous further patents are pending which may apply to this device or the applications thereof.

The specifications set out in this document are subject to change without notice. All products sold and services supplied by QRG are subject to our Terms and Conditions of sale and supply of services which are available online at and are supplied with every order acknowledgement. QProx, QTouch, QMatrix, QLevel, and QSlide are trademarks of QRG. QRG products are not suitable for medical including lifesaving equipment , safety or mission critical applications or other similar purposes. Except as expressly set out in QRG's Terms and Conditions, no licenses to patents or other intellectual property of QRG express or implied are granted by QRG in connection with the sale of QRG products or provision of QRG services. QRG will not be liable for customer product design and customers are entirely responsible for their products and applications which incorporate QRG's products.

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Datasheet ID: QT110A-ISG 519363