ST STM32 Nucleo-64-P User Manual

Hardware layout and configuration UM2206
24/55 UM2206 Rev 3
9.6 Programming/debugging when the power supply is not from
ST-LINK (5V_ST_link)
V
IN
or E5V is used as an external power supply in case the current consumption of the
STM32 Nucleo-64-P board and its extension boards exceed the allowed current on the
USB. In such condition it is still possible to use the USB for communication, programming or
debugging only.
In this case it is mandatory to power the board first using V
IN
or E5V then to connect the
USB cable to the PC. Proceeding this way the enumeration succeeds, thanks to the external
power source.
The following power sequence procedure must be respected:
1. Connect jumper JP5 between pins 3 and 4 for V
IN
or pins 5 and 6 for E5V
2. Be sure that SB9 is removed
3. Connect the external power source to V
IN
or E5V
4. Power ON the external power supply 7 V< V
IN
< 12 V to V
IN
, or 5 V for E5V
5. Check that the green LED LD3 is turned ON
6. Connect the PC to the USB connector CN1
If this sequence is not respected, the board may be powered by V
BUS
first from the ST-LINK,
with the following risks:
• If more than 500 mA current is needed by the board, the PC may be damaged or the
current supplied may be limited by the PC. As a consequence the board is not powered
correctly.
• 500 mA is requested at the enumeration (since SB9 must be OFF): this request can be
rejected and the enumeration does not succeed if the PC cannot provide such current,
consequently the board is not power supplied (LED LD3 remains OFF).
9.7 OSC clock sources
Three clock sources are listed below:
• LSE which is the 32.768 KHz crystal for the STM32 embedded RTC
• MCO which is the 8 MHz clock from the ST-LINK MCU for the STM32 microcontroller
• HSE which is the 8 MHz oscillator for the STM32 microcontroller. This clock is not
implemented on the STM32 Nucleo-64-P board.
9.7.1 LSE: OSC 32 KHz clock supply
There are three ways to configure the pins corresponding to the low-speed clock (LSE):
LSE on-board oscillator X3 crystal (Default configuration). Refer to Oscillator design
guide for STM8S, STM8A and STM32 microcontrollers Application note (AN2867) for
oscillator design guide for STM32 microcontrollers. It is recommended to use NX3215SA
manufactured by NDK (32.768
kHz, 6 pF, 20 ppm).
Oscillator from external to PC14 input: from external oscillator through pin 25 of the CN5
connector.
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ST STM32 Nucleo-64-P Specifications

General

Brand	ST
Model	STM32 Nucleo-64-P
Category	Motherboard
Language	English