qt102 Quantum Research Group, qt102 Datasheet - Page 6

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

2.5 Wiring
lQ
Re Figure 2.1, check the following sections for component values:
PIN
OD
IO
O
1
2
3
4
5
6
P
I
•
•
•
•
•
Section 2.2, page 5: Cs capacitor (Cs)
Section 2.3, page 5: Sample resistor (Rs)
Section 2.4, page 5: Voltage levels
Section 3.5.2, page 8: Rm
Section 3.3, page 7: Rop
Input only
Output only, push-pull
Open drain output
Input and output
Ground or power
NAME
SNSK
TIME
OUT
SNS
VDD
VSS
TYPE
ELECTRODE
IO
IO
O
P
P
I
SENSE
To switched circuit and output polarity selection resistor (Rop)
Ground power pin
To Cs capacitor and to sense electrode
To Cs capacitor and multiplier configuration resistor (Rm)
Rm must be fitted and connected to either VSS or VDD. Refer to Section 3.5 for details.
Positive power pin
Timeout configuration pin, which must be connected to either VSS, VDD, OUT or an RC network. Refer to
Section 3.5 for details.
(active high output, toggle on/off, no auto switch off)
RS
Figure 2.1 Basic Circuit Configuration
CS
Rm
Table 2.1 Pin Descriptions
3
4
SNS
SNSK
VDD
VDD
6
VSS
5
2
TIME
OUT
DESCRIPTION
6
1
Note: bypass capacitor to be tightly
wired between VDD and VSS and
kept close to QT102 pin 5.
Rop
QT102_2R3.05_1007