Data Sheet

Electrode trace routing: Keep the electrode trace (and the electrode itself) away from other signal, power,

and ground traces including over or next to ground planes. Adjacent switching signals can induce noise

onto the sensing signal; any adjacent trace or ground plane next to, or under, the electrode trace will

cause an increase in Cx load and desensitize the device.

Note: For proper operation, a 100 nF (0.1 μF) ceramic bypass capacitor must be used directly between

Vdd and Vss to prevent latch-up if there are substantial Vdd transients; for example, during an ESD

event. The bypass capacitor should be placed very close to the Vss and Vdd pins.

4.5 Power On

On initial power up, the QT1011 requires approximately 100 ms to power on to allow power supplies to

stabilize. During this time the OUT pin state is not valid and should be ignored.

AT42QT1011

Datasheet

DS40001947A-page 16