User's Manual

UM2819
Power supply
UM2819 - Rev 1
page 14/37
7.1.4 Current measurement
As the device has low power features, it can be interesting to measure the current consumed by NUCLEO-
WB55RG. To easily do this measurement, there are two possibilities:
1. Measure the supply current of the SoC using an ammeter in place of the JP1 jumper. In this case, all
supply sources can be used except the AVDD coming from the ARDUINO
®
connector. Figure 8 shows the
configuration.
Figure 8. Current measurement with an ammeter
ST Restricted
USB STLNK (CN15)
Arduino VIN (CN6-8)
MORPHO VIN (CN7-24)
LDO 5V
STM32WB55RG
LDO 3V3
LDO 3V3
JP1(3-4)
JP1(7-8)
Open
Close
Close
VDD
VDDA/VREF+
VDDSMPS
Arduino AVDD (CN5-8)
SB14
SB13
SB17
SB16
Open
Open
Open
STM32F103
(STLINK MCU)
NUCLEO-WB15CC
Ext (CN4-1)
JP2
JP1(1-2)
Open
VBAT
MORPHO 5V_EXT(CN7-6)
U2
Optional CR2032 Socket (CN2)
SB19
Open
Close
SB20
JP3
SW5
U4
Close
Close
Open
Open
SB25
SB27
SB26
SB24
Close
JP6
Close
U3
U5
A
+
JP1(5-6)
USB MCU (CN1)