AT42QT1010
Appendix A. Migrating from QT100A
A.1 Introduction
This appendix describes the issues that should be considered when migrating designs from the
QT100A to the QT1010.
A.2 Cs Capacitor
A.3 PCB Layout
The Cs Capacitor should be increased in value, assuming that other factors, such as the voltage
level and electrode size, remain the same. For example, at 3V, a Cs value of 4.± nF should be
increased to 8.2 nF.
There are no PCB layout issues as the two devices share a common footprint with the same
pinouts.
A.4 Power Consumption
The QT1010 has a range of 1.8 to 5.5V for Vdd, compared with 2.0 to 5.5V on the QT100A.
Notice should also be taken of the differences in power consumption in both Fast and LP
operation modes.
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ATMEL [ ATMEL ]
