QT1081 Datasheet, PDF (13/20 Pages) Quantum Research Group – 8-KEY QTOUCH SENSOR IC

4.5 Signal Processing
Vdd = 5.0, Ta = recommended, Cx = 5pF, Cs = 1nF
Description
Value
Detection threshold
10
Detection hysteresis
2
Anti-detection threshold
6
Anti-detection recalibration delay
2
Detect Integrator filter, normal mode
Detect Integrator filter, ‘fast’ mode
Max On-Duration
Normal drift compensation rate
Anti-drift compensation rate
6
2
10, 60, ∞
2,000
500
Units
counts
counts
counts
secs
samples
samples
secs
ms/level
ms/level
Notes
Threshold for increase in Cx load
Threshold for decrease of Cx load
Time to recalibrate if Cx load has exceeded anti-detection
threshold
Must be consecutive or detection fails
Must be consecutive or detection fails
Option pin selected
Towards increasing Cx load
Towards decreasing Cx load
lQ
13
QT1081_1R0.04_0307