UM2243 Rev 2 31/41
UM2243 Trigger signals between the X-NUCLEO-LPM01A and the target board
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13.2 Trigger signal from X-NUCLEO-LPM01A to target board
D2 and D3 on the Arduino connector are controlled from the X-NUCLEO-LPM01A to trigger
the target board for an event.
For example, a programmable current threshold can be set (only in controlled mode) to
trig
ger the D2 or D3 signal when the target board power consumption crosses this
threshold.
Please refer to the X-NUCLEO-LPM01A PowerShield firmware user manual [1] for a
detailed a description of how this trigger signal is
used in standalone and controlled modes.
The trigger signals D2 and D3 are active low. A 100 kohm pull up resistor to VOUT biases
D2 an
d D3.
Solder bridges SB5 and SB3 (respectively for D2 and D5) are open by default. One of them
m
ust be closed to enable this trigger feature, see Figure 23.
Figure 22. Arduino D2, D3 trigger signal to target schematics
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Figure 23. Arduino Uno D2, D3 trigger signal to target and solder bridges SB3, SB5
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