qt102 Quantum Research Group, qt102 Datasheet - Page 12

• Manufacturer Part Number: qt102
• Description: Qtouch? Toggle-mode Charge-transfer Ic Touch Screen With Power Management Functions
• Manufacturer: Quantum Research Group

3.6 Examples of Typical Applications
lQ
Setting the delay multiplier to x24 will decrease the key sensitivity, so it may be necessary to increase the value of Cs.
ELECTRODE
SENSE
ELECTRODE
SENSE
Active high, driving high impedance, auto off time 135s x 1 (2.25 minutes)
Active low, driving PNP transistor, auto off time 500s x 24 (3.33 hours)
10k
RS
10k
Rs
Auto off time obtained from 5V chart in Figure 3.12.
Auto off time obtained from 3V chart in Figure 3.13
Rm
CS
22nF
Rm
CS
6.8nF
(x24)
1M
100nF
Figure 3.15 Application 2
Figure 3.14 Application 1
3
4
SNS
SNSK
100nF
3
4
SNS
SNSK
VDD
+3V
VSS
5
2
12
VDD
+5V
VSS
TIME
OUT
5
2
TIME
OUT
6
1
Ct
Rt
6
1
Rt
Ct
10nF
47k
10k
47nF
Rop
DTA143
2.2k
2.2k
QT102_2R3.05_1007
Load