5V_Vin Power Source: 7 To 12 V, 800 Ma Maximum; Figure 9. Jp4 [1-2]: 5V_Stlk Pwr Source - ST STM32L562E-DK User Manual

Discovery kit with stm32l562qe mcu

Hide thumbs Also See for STM32L562E-DK:

User manual (64 pages)

Table Of Contents

Table of Contents

6.3.2

Power supply input from STLINK-V3E USB connector (default setting): 5V/500mA

5V_STLK is a DC power with limitation from CN17 STLINK-V3E USB connector, the USB type Micro-B connector

of STLINK-V3E. In this case, the JP4 jumper must be on pin [1-2] to select 5V_STLK power source on JP4

silkscreen. This is the default setting. If the USB enumeration succeeds, the 5V_STLK power is enabled, by

asserting the PWR_ENn signal (from the STLINK-V3E MCU). This pin is connected to a power switch

STMPS2151STR, which powers the board. This power switch features also a 500 mA current limitation to protect

the PC in case of an onboard short-circuit.

The Discovery board and its shield on it can be powered from the CN17 STLINK-V3E USB connector, but only

STLINK-V3E circuit has the power before USB enumeration because the host PC only provides 100 mA to the

board at that time. During the USB enumeration, the Discovery board asks for 500 mA current to the host PC. If

the host is able to provide the required power, the enumeration finishes by a SetConfiguration command and

then, the power switch is switched ON, the green LED LD12 turned ON, thus the Discovery board and its shield

on it can consume 500 mA current, but no more. If the host is not able to provide the requested current, the

enumeration fails. Therefore the power switch remains OFF and the MCU part including the expansion board is

not powered. As a consequence, the green LED LD12 remains turned OFF. In this case, it is mandatory to use

another power supply.

5V_STLK power source configuration for jumper JP4 [1-2] is described in

6.3.3