E240B QUANTUM ATMEL, E240B Datasheet - Page 12

• Manufacturer Part Number: E240B
• Description: QT240 4 Key Qtouch Evaluation Kit
• Manufacturer: QUANTUM ATMEL

Specifications of E240B

• Silicon Manufacturer: Atmel
• Application Sub Type: Touch Sensor
• Kit Application Type: Sensing - Touch / Proximity
• Silicon Core Number: QT240
• Kit Contents: Board And Literature
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The sensitivity of the keys has been tailored to match the supplied plastic panel. To make a key
more sensitive, increase the value of its corresponding Cs capacitor (see chart below). To make
it less sensitive, decrease it’s Cs value. Only use 5% or 10% X7R ceramic capacitors; most other
types will be unstable and give erratic results.
C9 = Spread Spectrum Capacitor (see next page for details)
C5~C8 = Sample Capacitors (Cs) - increase to increase sensitivity
Key #
1
2
3
4
SENSITIVITY
Cs Capacitor
C5
C6
C7
C8
Factory Default
22nF
22nF
22nF
22nF
11