10
4.1
Connector X1: Power + Digital Interface
The pin configuration of the connector X1 is given in Tab. 1. Pins 1-
3 are for power supply of the module. The transmit and receive
pins of the UART-interface are given at pins 4+5. The additional
pins 6+7 are only needed if the module should be operated in auto-
mode (see following chapter). In standard operation mode both
pins 6+7 should be left unconnected.
Pin Name
Function
Description
1
GND
Power
Ground
2
VCC
Power
Power supply
min. 3.5V max. 5.0V DC
max. 50 mA (typical 30 mA)
3
GND
Power
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 auto-mode pin
unconnected for normal
operation. Connect to GND
for auto-mode operation.
7
/TRIG
Digital Input
(0V or 3.3V,
internally pulled-
up to 3.3V)
Trigger input for triggering a
measurement in "triggered
auto-mode". The trigger is
activated at the moment,
when the unconnected pin is
tied to GND.
Tab. 1
Pin configuration of the connector X1
