96
Pin
Name
Function
Description
1
GND
Power
Ground
2
VCC
Power
Power supply,
3.5V to 5.0V DC
max. 70 mA (typ 40 mA)
3
/USB_DISABLE
Disables USB interface
Ground
4
TXD
Digital Output
(0V or 3.3V)
Data transmission pin
of the UART interface
5
RXD
Digital Input
(0V or 3.3V)
(5V tolerant)
Data receive pin of the
UART interface
6
/AUTO
Digital Input
(0V or 3.3V, internally
pulled-up to 3.3V)
Leave the /AUTO pin
unconnected for normal
operation. Connect to
GND for auto-mode
operation.
7
/TRIG_AIN
Digital Trigger Input
or Analog Input
(0...2.5VDC)
If used as trigger input,
a 10kOhm pull-up
resistor must be
connected between
pin 7 and pin 2 (VCC).)
The trigger input is used
for triggering a
measurement in the
“triggered auto-mode”.
The trigger is activated
at the moment, when
the pin is tied to GND.
Alternatively this pin
can be used to read in
analog voltage signal.
Pin 7 (/TRIG_AIN) can be used for two alternative functions. Either
it is used as a trigger input for triggering measurements in
“triggered auto mode” (see chapter 11.3). In this case, the pin 7
must be permanently connected via a 10kOhm resistor (“pull-up
resistor”) to VCC at pin 2. The trigger is then activated by
connecting pin 7 shortly to GND at pin 1 (“falling edge sensitive
trigger”).
Alternatively, pin 7 can be used as an analog input for reading in
voltage signals (0..2.5 VDC), e.g. from an external sensor. If
Analog
In
is activated in the
Settings
of the
Pyro Oxygen Logger
software,
