UM2153 datasheet(20/57 Pages) STMICROELECTRONICS

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Hardware layout and configuration

UM2153

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DocID030118 Rev 3

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0 ohm resistor (0402 size) at R5 position

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0 ohm resistor (0402 size) at R7 position

The STM32L4 Discovery kit can be powered by the USB connectors at 5 V DC with 500 mA

current limitation.

A USB power switch (IC19) is also connected on VBUS and provides power to CN9. The

green LED LD9 is lit when either:

•

Power switch is ON and STM32L4 Discovery kit works as an USB host

•

VBUS is powered by another USB host when STM32L4 Discovery kit works as a USB

device.

The red LED LD8 is lit when an over-current occurs.

7.9

Quad-SPI NOR Flash memory

64-Mbit Quad-SPI NOR Flash memory (N25Q128A13EF840F from MICRON) is connected

to the Quad-SPI interface of the STM32L475VGT6.

7.10

Virtual COM port

The serial interface USART6 is directly available as a virtual COM port of the PC connected

to the ST-LINK/V2-1 USB connector CN7. The virtual COM port settings are configured as:

115200 b/s, 8 bits data, no parity, 1 stop bit, no flow control.

7.11

RF modules

Four RF interfaces are available on the STM32L4 Discovery kit for IoT node board:

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Bluetooth (V4.1 compliant) SPBTLE-RF module

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Sub-GHz (868 or 915 MHz) low-power-programmable RF module (SPSGRF-868 or

SPSGRF-915),

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Wi-Fi module Inventek ISM43362-M3G-L44 (802.11 b/g/n compliant)

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Dynamic NFC tag based on M24SR with its printed NFC antenna (double layer

inductive antenna etched on the PCB).

7.11.1

Bluetooth (V4.1 compliant) SPBTLE-RF module

The ST SPBTLE-RF module (M1) is implemented on top side of the STM32L4 Discovery kit

for IoT node board.

The SPBTLE-RF is an easy to use Bluetooth smart master/slave network processor module,

compliant with Bluetooth V4.1. The SPBTLE-RF B-Smart module supports multiple roles

simultaneously, and it can act at the same time as Bluetooth Smart sensor and hub device.

The entire Bluetooth Smart stack and protocol are embedded into the SPBTLE-RF B-Smart

module. The external host application processor, where the application resides, is

connected to the SPBTLE-RF B-Smart module through a standard SPI interface (SPI3 of

STM32L475VGT6).

The SPBTLE-RF B-Smart module provides a complete RF platform in a tiny form factor (foot

print of this module is 13.5 mm x 11.5 mm). Radio, antenna, high frequency and LPO

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