4
AT42QT1070 [DATASHEET]
9596C–AT42–05/2013
1.5 Pin Descriptions
I Input only O Output only, push-pull
OD Open drain output P Ground or power
Table 1-1. Pin Listings (14-pin SOIC)
Pin
Name
(Comms
Mode)
Name
(Standalone
Mode)
Type Description
If Unused,
Connect
To...
1 VDD VDD P Power –
2 MODE MODE I
Mode selection pin
Comms Mode – connect to Vss
Standalone Mode – connect to Vdd
–
3 SDA OUT0 OD
Comms Mode – I
2
C data line
Standalone Mode – open drain output for guard
channel
Open
4 RESET RESET I RESET – has internal pull-up 60 k resistor Open
5 CHANGE OUT4 OD
CHANGE line for controlling the communications
flow
Comms Mode – connect to CHANGE
line
Standalone Mode – connect to output
Open
6 SCL OUT3 OD
Comms Mode – connect to
I
2
C
clock
Standalone Mode – connect to output
Open
7 KEY6 OUT2 O/OD
Comms Mode – connect to
Key 6
Standalone Mode – connect to output
Open
8 KEY5 OUT1 O/OD
Comms Mode – connect to
Key 5
Standalone Mode – connect to output
Open
9 KEY4 KEY4 O Key 4 Open
10 KEY3 KEY3 O Key 3 Open
11 KEY2 KEY2 O Key 2 Open
12 KEY1 KEY1 O Key 1 Open
13 KEY0 KEY0 O Key 0 Open
14 VSS VSS P Ground –
