Clock sources
2. Use an external power supply with current measurement capabilities. In this case, the JP2 jumper must be
removed, and the supply connected to JP2 pin 2, as shown in Figure 9. The supply voltage must be between
1.8 and 3.3 V. AVDD input (CN1 pin 8) must not be used during this measurement.
Figure 9. Current measurement with an external power supply
7.2 Clock sources
7.2.1 HSE clock reference
The accuracy of the HSE high‑speed clock of the SoC is committed to a 32 MHz crystal oscillator. The HSE
oscillator is trimmed during board manufacturing.
7.2.2 LSE clock reference
The accuracy of the LSE low‑speed clock of the SoC is committed to a 32.768 kHz crystal oscillator.
7.3 Reset sources
The NUCLEO-WB55RG reset signal is active LOW. The internal pull-up resistor forces the RST signal to a high
level.
The sources of reset are:
• B4 reset push button
• Embedded ST-LINK/V2-1
• CN2 ARDUINO
®
connector pin 3 (ARDUINO
®
board reset).
• CN7 ST morpho connector pin 14
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