qt1106 Quantum Research Group, qt1106 Datasheet - Page 17

• Manufacturer Part Number: qt1106
• Description: Qwheel?/qslide?/qtouch? Ic Touch Screen
• Manufacturer: Quantum Research Group

7.5 Signal Processing
Vdd = 5.0V, Ta = recommended, Cx = 5pF, Cs keys = 4.7nF, Cs wheel/slider = 15nF, no spread-spectrum network,
Rb1 = 20k ; circuit of Figure 2.1
Lq
Description
Detection threshold (keys)
Detection threshold
(wheel/slider)
Detection hysteresis (keys)
Detection hysteresis
(wheel/slider)
DI filter, start of touch, normal
mode
DI filter, start of touch, fast DI
mode
DI filter, end of touch
Anti-detection threshold
Anti-detection filter
Faulty channel filter
Maximum On-duration
Parameter
Voh
Trst
Vol
Ar
Iil
Description
Low output voltage
High output voltage
Input leakage current
Acquisition resolution
External reset low pulse width
10, 20,
infinite
Value
60,
10
40
2
5
6
2
2
8
6
1
samples
samples
samples
samples
samples
counts
counts
counts
counts
counts
Units
secs
Vdd-0.5
Min
2
Notes
Threshold for increase in Cx load
Changeable through SPI
12.5 percent of wheel/slider detection threshold.
Must be consecutive or detection fails
Must be consecutive or detection fails
Threshold for decrease of Cx load
In these modes: Free Run, 200ms LP, 280ms LP, Sync with 55Hz
sync
17
Typ
14
Max
0.5
±1
Units
bits
µA
µs
V
V
Notes
7mA sink
2.5mA source
QT1106_8IR0.07_0907