at42qt100a ATMEL Corporation, at42qt100a Datasheet

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at42qt100a

Manufacturer Part Number
at42qt100a
Description
Qtouch? Charge Transfer Ic
Manufacturer
ATMEL Corporation
Datasheet
Features
Number of Keys:
Technology:
Key outline sizes:
Electrode design:
PCB Layers required:
Electrode materials:
Electrode substrates:
Panel materials:
Panel thickness:
Key sensitivity:
Interface:
Moisture tolerance:
Power:
Package:
Signal processing:
Applications:
Patents:
– One
– Patented spread-spectrum charge-transfer
– 6 mm x 6 mm or larger (panel thickness dependent); widely different sizes and
– Solid or ring electrode shapes
– One
– Etched copper, silver, carbon, Indium Tin Oxide (ITO)
– PCB, FPCB, plastic films, glass
– Plastic, glass, composites, painted surfaces (low particle density metallic paints
– Up to 50 mm glass, 20 mm plastic (electrode size and Cs dependent)
– Settable via capacitor (Cs)
– Digital output, active high
– Good
– 2V – 5.5V; 6.5 µA at 2.0V typical
– 6-pin WSON RoHS compliant
– 10-pin MSOP RoHS compliant (available to special order with 50K MOQ)
– Self-calibration, auto drift compensation, noise filtering
– Control panels, consumer appliances, toys, lighting controls, mechanical switch
– QTouch™ (patented charge-transfer method)
shapes possible
possible)
or button
QTouch
Charge Transfer
IC
AT42QT100A
9531A–AT42–02/09

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at42qt100a Summary of contents

Page 1

... MSOP RoHS compliant (available to special order with 50K MOQ) • Signal processing: – Self-calibration, auto drift compensation, noise filtering • Applications: – Control panels, consumer appliances, toys, lighting controls, mechanical switch or button • Patents: – QTouch™ (patented charge-transfer method) ™ QTouch Charge Transfer IC AT42QT100A 9531A–AT42–02/09 ...

Page 2

... N/C – 4 Vss 2 5 Vdd 5 6 N/C – 7 SYNC 6 8 N/C – 9 OUT Input only I/O Input and output O Output only, push-pull P Ground or power AT42QT100A 2 SNSK 1 6 SNS 2 QT100A N N Vss 5 Type Comments I/O Sense pin I/O Sense pin O Unused O Unused P Supply ground P Power I ...

Page 3

... Basic Circuit Configuration for 6-pin WSON Package QT100A, 6-WSON Pkg. *Cb VDD SNSK OUT SNS SYNC VSS *Note: Bypass capacitor Cb should be tightly wired between Vdd and Vss ™ ) touch sensor is a self-contained digital IC capable of AT42QT100A SENSE ELECTRODE ...

Page 4

... The traces and any components associated with SNS and SNSK will become touch sensitive and should be treated with caution to limit the touch area to the desired location. A series resistor, Rs, should be placed in line with SNSK to the electrode to suppress ESD and EMC effects. AT42QT100A 4 shows a basic circuit using the 6-pin WSON package. 9531A–AT42–02/09 ...

Page 5

... The QT100A runs in Fast mode if the SYNC pin is permanently high. In this mode the QT100A runs at maximum speed at the expense of increased current consumption. Fast mode is useful when speed of response is the prime design requirement. The delay between bursts in Fast mode is approximately 1 ms, as shown in 9531A–AT42–02/09 AT42QT100A Figure 3-1. 5 ...

Page 6

... Fast mode SYNC is sampled low, then the device goes to sleep. From then on, it will operate in Sync mode (Figure 3-2 on page SYNC signal should be longer than the burst length AT42QT100A 6 Fast Mode Bursts (SYNC Held High) SNSK ...

Page 7

... QT100A1 SYNC Sync Mode (Short Pulses) SNSK QT100A1 >10us SYNC 3-3). 8. Recalibration timeout is a fixed number of measurements so will vary AT42QT100A sleep Revert to Fast Mode slow mode sleep period sleep Revert to Slow Mode slow mode sleep period (Figure >10us >10us Section 3.3 on page 7 3-4) ...

Page 8

... Figure 3-5. Once an object is sensed, the drift compensation mechanism ceases since the signal is legitimately high, and therefore should not cause the reference level to change. AT42QT100A 8 (Figure 3-5) is performed by making the reference level track the raw signal Drift Compensation ...

Page 9

... The HeartBeat indicator can be sampled by using a pull-up resistor on the OUT pin on page other circuit. The pulses will only be visible when the chip is not detecting a touch. 9531A–AT42–02/09 10), and feeding the resulting positive-going pulse into a counter, flip flop, one-shot, or AT42QT100A (Figure 3-6 9 ...

Page 10

... OUT current should be limited to < prevent gain-shifting side effects, which happen when the load current creates voltage drops on the die and bonding wires; these small shifts can materially influence the signal level to cause detection instability. AT42QT100A 10 Obtaining HeartBeat Pulses with a Pull-up Resistor (6-pin WSON Package) ...

Page 11

... ESD event. The bypass capacitor should be placed very close to the Vss and Vdd pins. 9531A–AT42–02/09 for the power supply range current drain averages less than 3) should be placed as close to the body of the chip as possible so that the AT42QT100A ™ Design, and the Touch 11 ...

Page 12

... Time between end of burst and start of the next (LP mode) T Burst length BL T Response time R T HeartBeat pulse width HB AT42QT100A 12 -40°C to +85°C -55°C to +125° +6.0V ±20 mA Infinite Infinite -0. 0.6) Volts DD +2.0 to 5.5V ±20 mV ±100 ...

Page 13

... Min Typ Max Units 600 µA 6 µA 45 100 V/s 0.8 2.2 0.6 V -0.7 DD ±1 µA 0 100 bits AT42QT100A Notes See Note 1 See Note 1 Section 2.1.2 Notes Required for proper start-up V SYNC pin V SYNC pin V OUT sink V OUT source 13 ...

Page 14

... Mechanical Dimensions 5.6.1 6-pin WSON AT42QT100A 14 9531A–AT42–02/09 ...

Page 15

... MSOP (available to special order with 50K MOQ) 9531A–AT42–02/09 AT42QT100A 15 ...

Page 16

... Datecode (variable) Pin 1 ID 5.8 Part Number Part Number QT100A-ISG QT100A-ISMG 5.9 Moisture Sensitivity Level (MSL) AT42QT100A 16 QT100A QRG 1R7 run nr. QT100A DATECODE Description 6-pin WSON RoHS compliant IC 10-pin MSOP RoHS compliant IC (available to special order with 50K MOQ) MSL Rating Peak Body Temperature MSL3 Code revision 1 ...

Page 17

... Revision History Revision No. Revision A – February 2009 9531A–AT42–02/09 AT42QT100A History  Initial release for chip revision 1.7. 17 ...

Page 18

... Atmel Corporation. All rights reserved. Atmel ™ ™ QTouch , HeartBeat and others are trademarks of Atmel Corporation or its subsidiaries. Other terms and product names may be registered trademarks or trademarks of others. International Atmel Asia Atmel Europe Unit 01-05 & 16, 19/F ...

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