7.4.1 Power source selection
The STM32N6570-DK product is designed to be powered by a 5 V DC power supply. It is possible to configure
the Discovery board with JP2 headers to use any of the four sources described in Table 5 for the 5 V DC power
supply.
Table 5. 5 V power configurations
Reference
Jumper
(1)
Function Comment
JP2
5V_STLK
5 V is supplied from
USB STLK (CN6)
• 5 V (+/- 5%)
• 3.5 A embedded overcurrent
protection
• Up to 3 A capable
USB_SNK
5 V is supplied from
USB1 (CN18)
• 5 V (+/- 5% at current < 500 mA)
• Up to 3 A (check USB Type-C
®
VBUS
constraints in that case)
5V_VIN
5 V is supplied from
ARDUINO
®
connector (CN8)
• 5 V (+/- 5%)
• Up to 0.8 A capable
1. The default setting is in bold
7.4.2 STLK (for compatibility with legacy USB Host port)
Figure 8 shows the selection of 5 V from 5V_STLK on JP2 [1-2], with a power source connected to USB ST-LINK
(CN6). It is the default setting.
The STLK ST-LINK USB Type-C
®
connector (CN6) can power the STM32N6570-DK Discovery kit, but the host
PC only provides 100 mA to the ST-LINK circuit until the end of USB enumeration. At the end of the USB
enumeration, the STM32N6570-DK Discovery kit asks for a 2 A current to the host PC.
If the USB enumeration succeeds, a power switch powers the board with up to 3.2 A current. This power switch
also features a 550 mA, 1.66 or 3.2 A current limitation to protect the PC in case of overcurrent on the board.
Figure 8. STLK (JP2) from USB STLK (CN6)
7.4.3 User USB1
Figure 9 shows the selection of 5 V DC power from USER USB1 on JP2, with a power source connected to the
USB Type-C
®
connector (CN18). The LED (LD9) lights up. A power switch with a protective circuit protects the
STM32N6570-DK Discovery kit from overvoltage on VBUS. The USB Type-C
®
VBUS nominal voltage must be in
the 5 V +/- 5% range.
The following constraints apply to USB Type-C
®
host types to be used:
• USB 2.0 or USB 3.x legacy hosts might be used if they can provide 500 mA without data communication. In
practice, today nearly all these ports deliver 500 mA without data communication.
It is preferable to use USB ports showing charging port marking in that case ( ), as they enable higher
currents.
• Any other USB Type-C
®
source type can supply and start up the STM32N6570-DK board, up to 3 A. When
powered through USB1(CN18), LED (LD9) lights up.
UM3300
Hardware layout and configuration
UM3300 - Rev 1
page 14/49
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