Table 2.1 Pin Descriptions
PIN NAME TYPE
DESCRIPTION
1
OUT
O
To switched circuit and output polarity selection resistor (Rop)
2
VSS
P
Ground power pin
3
SNSK
IO To Cs capacitor and to sense electrode
4
SNS
IO
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.
5
VDD
P
Positive power pin
6
TIME
I
Timeout configuration pin, which must be connected to either VSS, VDD, OUT or an RC network. Refer to
Section 3.5 for details.
I Input only
O Output only, push-pull
OD Open drain output
IO Input and output
P Ground or power
Figure 2.1 Basic Circuit Configuration
(active high output, 15 minute auto switch-off)
SENSE
ELECTRODE
RS
VDD
5
Note: bypass capacitor to be tightly
wired between VDD and VSS and
kept close to QT102 pin 5.
VDD
3 SNSK
OUT 1
CS
4 SNS
Rop
Rm
TIME 6
VSS
2
Re Figure 2.1, check the following sections for component values:
• 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
lQ
6
QT102_2R3.04_0807