ST STM32 Nucleo-64-P User Manual (English)

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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)

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

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

or pins 5 and 6 for E5V

2. Be sure that SB9 is removed

3. Connect the external power source to V

or E5V

4. Power ON the external power supply 7 V< V

< 12 V to V

, 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

Ethernet	No
Microcontroller	STM32
Core	ARM Cortex-M
Operating Voltage	3.3V
Input Voltage	7-12V
Communication Interfaces	SPI, I2C
SRAM	Varies by STM32 variant
Clock Speed	Varies by STM32 variant
USB	Yes
Arduino Compatibility	Yes
ST Morpho Headers	Yes
On-board Debugger	ST-LINK/V2-1
USB Connector	Micro-USB
Extension Headers	Arduino Uno Revision 3 connectivity, ST morpho extension pin headers for full access to all STM32 I/Os