UM2243 Rev 2 29/41
UM2243 Trigger signals between the X-NUCLEO-LPM01A and the target board
40
13 Trigger signals between the X-NUCLEO-LPM01A
and the target board
This section describes the optional signals between the X-NUCLEO-LPM01A and the target
board that allow an event to be triggered. Trigger signals are available on both Arduino
Nano and Arduino Uno pins D2, D3 and D7:
• D7 is a trigger signal from the target board to the X-NUCLEO-LPM01A
• D2 and D3 are trigger signals from the X-NUCLEO-LPM01A to the target board.
See Figure 2 for an overview of these signal connections.
13.1 Trigger signal from the target board to the
X-NUCLEO-LPM01A
The trigger signal on Arduino connector alias D7 is controlled from the target board to
trigger the X-NUCLEO-LPM01A for a conversion start or event trigger. Please refer to the
X-NUCLEO-LPM01A PowerShield firmware user manual [1] for a detailed description of the
use of this trigger signal in standalone and controlled modes.
The trigger signal D7 is active high. A 3.3 Mohm pu
ll down resistor in the circuitry avoids
uncontrolled trigger events if D7 signal is not connected or floating on the target board side.
Solder bridge SB26 is closed by default. If it needs to be opened, see Figure 20: Arduino
Uno D7 trigger signal from target and solder bridges SB26.
Figure 19. Arduino D7 trigger signal from target schematics
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