UM2243 Rev 2
13/41
UM2243
Supplying power to the X-NUCLEO-LPM01A
40
7
Supplying power to the X-NUCLEO-LPM01A
The X-NUCLEO-LPM01A board is designed to be powered from one of the three following
power sources:
•
USB FS micro-B connector (either USB host port or USB charger) via CN5
•
External DC power supply via CN7
•
Arduino Uno (CN4) connector or Arduino Nano (CN13) connector via the 5V pin
See
Figure 2: Hardware block diagram
for details regarding the power tree, and
Figure 3: X-NUCLEO-LPM01A layout top view
for connector locations.
Table 2. Power input source setting summary
Power source
from
Power connection
JP3 setting
JP2
setting
ARD
USB
Ext
USB host
CN5: USB Type micro-B connector
open
closed
open
open
USB charger
CN5: USB Type micro-B connector
open
closed
open
closed
Ext power supply
CN7: 7 V to 10 V DC pin +
CN7: GND pin -
open
open
closed
open
Arduino Uno
connectors
CN4:
pin 5V
CN4:
pin GND
closed
open
open
open
Arduino Nano
connectors
CN13: pin +5V
CN13: pin GND
closed
open
open
open
Note:
Regardless of the power supply input source, the X-NUCLEO-LPM01A board must be
powered by a power supply unit or by an auxiliary equipment complying with the standard
EN-60950-1: 2006+A11/2009, and must be Safety Extra Low Voltage (SELV) with limited
power capability.
7.1
Power source from an USB host port (default setting)
A jumper should be inserted in the ‘USB’ position of JP3 as shown in
. No jumper should be inserted in JP2.
A USB Type-A to USB Type micro-B cable is required to supply the X-NUCLEO-LPM01A
board (CN5: USB FS micro-B connector) to a PC host USB port.
When the USB cable is connected, 5 V DC is provided by VBUS from the USB host port of
the PC. At this step, only the embedded MCU of X-NUCLEO-LPM01A is supplied. A USB
enumeration is performed between the embedded MCU and the host PC to negotiate
500 mA on VBUS. If USB enumeration succeeds, X-NUCLEO-LPM01A peripherals are
supplied and the target board supply can be enabled. Otherwise (if USB enumeration fails),
the X-NUCLEO-LPM01A peripherals are not supplied, the red LED (LD2) is turned ON and
a message is displayed on the LCD display.
If an abnormal current higher than 600 mA is drawn from the USB connector (CN5) by the
X-NUCLEO-LPM01A, an embedded current protection clamps the current and LED LD5
