ST X-NUCLEO-LPM01A, User Manual

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UM2243 Rev 2 15/41
UM2243 Supplying power to the X-NUCLEO-LPM01A
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7.3 Power source from an external DC power supply.
A jumper should be inserted in the 'EXT' position of JP3 as shown in Figure 7: JP3 and CN7
(Ext Pwr setting) . An external DC power supply with an output voltage of 7 to 10 V with
500 mA minimum current capability is connected to connector CN7. Take care about the
positive and negative polarities of the CN7 connector pins, as shown in
Figure 7 .
Nevertheless, the X-NUCLEO-LPM01A has a series-connected reverse-polarity protection
diode to prevent damage in the event of an inadvertent reversed polarity connection (see
Figure 2: Hardware block diagram ).
Figure 7.
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JP3 and CN7 (Ext Pwr setting)
Note: The X-NUCLEO-LPM01A external voltage range has been limited to 10 V maximum to limit
self-heating of the board, and so limit measurement variations. Nevertheless, a standard
L7805 voltage regulator is used to convert the DC voltage from CN7 to 5 V. Thus the input
voltage can be extended to 16 V without risk of damaging the board.