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UM2153 Datasheet(PDF) 19 Page - STMicroelectronics |
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UM2153 Datasheet(HTML) 19 Page - STMicroelectronics |
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19 / 57 page  DocID030118 Rev 3 19/57 UM2153 Hardware layout and configuration 56 7.5 Programming/debugging when the power supply is not from ST-LINK (5V_ST_LINK) It is mandatory to power the board first using CN2 (VIN) or CN9 (USB_FS_OTG), then connecting the USB cable to the PC. Proceeding this way ensures that the enumeration succeeds thanks to the external power source. The following power sequence procedure must be respected: • Connect the jumper JP4 on (5V_ARD) or (5V_USB_FS) • Connect the external power source to CN2 in case of an Arduino shield or to CN9 in case of USB FS host interface • Check that the red LED LD5 is turned ON • Connect the PC to USB connector CN7 If this sequence is not respected, the board may be powered by VBUS first from ST-LINK, and the following risks may be encountered: • If more than 500 mA current is needed by the board, the PC may be damaged or current can be limited by PC. As a consequence the board is not powered correctly. • 500 mA is requested at the enumeration, so there is a risk that the request is rejected and enumeration does not succeed if the PC cannot provide such current. 7.6 Clock sources Three clock sources are described below: • X1 which is the 8 MHz oscillator for STM32L475VG microcontroller. This clock is not implemented in a basis configuration. • X2 which is the 32.768 KHz crystal for the STM32L475VG embedded RTC • X3 which is the 8 MHz clock from ST-LINK MCU for the STM32L475VG microcontroller. 7.7 Reset sources The reset signal of the STM32L4 Discovery kit is active low and the reset sources includes: • A reset button B1 • An Arduino Uno V3 shield board from CN2 • An embedded ST-LINK/V2-1 7.8 USB OTG FS The STM32L4 Discovery kit supports USB OTG FS communication via a USB Micro-AB connector (CN9). To do this the following components must be added by the users: • 8 MHz crystal (at X1 position); ref: NX3225GD-8.00M • 8.2 pF capacitor (0402 size) at C2 position • 8.2 pF capacitor (0402 size) at C4 position |
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