Ublox EVK BMD-345 Manual de usuario

EVK BMD-345

Evaluation kit for BMD-345 module

User guide



Abstract

This document describes how to set up the EVK-BMD-345 evaluation kit to evaluate the BMD-

345

modules. It also describes the different options for debugging and the development capabilities

included in the evaluation board.

www.u-blox.com

UBX-19033356 - R01

EVK BMD-345 - User guide

UBX-19051533 - R01 Document information Page 2 of 27

Document information

Title EVK BMD-345

Subtitle Evaluation kit for BMD-345 module

Document type User guide

Document number UBX-19051533

Revision and date R01 5-Dec-2019

Disclosure restriction

This document applies to the following products:

Product name Type number

BMD-345-Eval BMD-345-Eval-00

u-blox or third parties may hold intellectual property rights in the products, names, logos and designs included in this

document. Copying, reproduction, modification or disclosure to third parties of this document or any part thereof is only

permitted with the

express written permission of u-blox.

The information contained herein is provided “as is” and u

-blox assumes no liability for its use. No warranty, either express or

implied, is given, including but not limited

to, with respect to the accuracy, correctness, reliability and fitness for a particular

purpose of the information. This document may be revised by u

-blox at any time without notice. For the most recent

documents, visit www.u

-blox.com.

-blox AG.

EVK BMD-345 - User guide

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Contents

Document information................................................................................................................................2

Contents ..........................................................................................................................................................3

1Product description ..............................................................................................................................4

1.1 Key features ................................................................................................................................................. 4

1.2 Kit includes ...................................................................................................................................................5

1.3 Development tools ...................................................................................................................................... 5

2Hardware description...........................................................................................................................6

2.1 Power ............................................................................................................................................................. 6

2.1.1 Powering the board ............................................................................................................................6

2.2 Reset..............................................................................................................................................................7

2.3 Buttons..........................................................................................................................................................9

2.4 LEDs............................................................................................................................................................... 9

2.5 Virtual COM port .......................................................................................................................................10

2.6 32 kHz crystal oscillator ..........................................................................................................................10

2.7 NFC connector ...........................................................................................................................................11

2.8 Current sensing headers .........................................................................................................................11

2.9 External SEGGER J-Link™ debug interface ........................................................................................11

2.10 QSPI .............................................................................................................................................................13

2.11 GPIO jumpers .............................................................................................................................................13

2.12 Header pin-out ...........................................................................................................................................14

3Setting up the evaluation board.................................................................................................... 17

3.1 Set up the tool chain.................................................................................................................................17

3.2 Connect BMD-345 evaluation kit to a computer................................................................................18

3.3 Modify an example to enable the PA / LNA..........................................................................................20

3.3.1 Example setup...................................................................................................................................20

3.3.2 Example test......................................................................................................................................23

Related documents ................................................................................................................................... 26

Revision history.......................................................................................................................................... 26

Contact.......................................................................................................................................................... 27

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1Product description

The BMD-345-EVAL kit provides stand-alone use of the BMD-345 module featuring the Nordic

nRF52840 RF System on Chip (SoC) and a Skyworks RFX2411 Power Amplifier / Low Noise Amplifier

(PA / LNA).

The evaluation kit provides a great starting point for almost any Bluetooth 5 low energy, Thread, or

Zigbee project. All features of the BMD-345 are easily accessed from the evaluation board. A simple

USB connection provides power, programming, and a virtual COM port. Four user buttons are

available, as well as a USB peripheral connector, user LEDs, and a reset button. 44 GPIO are available

on headers that are compatible with the Arduino® form factor. This allows easy use of existing

Arduino shields. Current sense resistors allow for measuring current into the module and into the

shield.

This guide provides setup instructions for starting development and describes the hardware

functionality of the BMD-345-EVAL board.

1.1 Key features

•Used for evaluation of BMD-345 module

•On-board programming and debug (SEGGER J-Link-OB)

•Able to program external modules

•Virtual COM port over USB

•44 GPIO of the BMD-345 / nRF52840

•Buttons and LEDs for user interaction

•NFC antenna connector

•32.768 kHz Crystal

•USB peripheral connector

•Multiple power inputs

Figure 1: EVK BMD-345 evaluation board (Top view)

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1.2 Kit includes

BMD-345 evaluation kit includes:

•BMD-345 evaluation board

•Micro-USB cable

•NFC antenna

•2.4 GHz antenna kit

1.3 Development tools

The tools listed below will aid in development with the BMD-345 modules. Not all tools will be required

depending on which software suite is used.

Tool Description

SEGGER Embedded Studio SEGGER Embedded Studio is an easy-to-use integrated development environment with

project management tools, editor and debugger supporting ARM Cortex devices. Full

debug support including Real Time Terminal (RTT) output is also available. Available for

Windows, macOS, and Linux.

Free license for use with the Nordic nRF5 ICs and modules:

http://license.segger.com/Nordic.cgi

SEGGER J-Link Software and

Documentation Pack

J-Link Commander (JLink.exe) is a command line-based utility that can be used for

verifying proper functionality of J-Link as well as for simple analysis of the target

system. It supports some simple commands, such as memory dump, halt, step, go etc.

to verify the target connection. Available for Windows, macOS, and Linux.

Nordic Semiconductor SDK The nRF5 SDK is your first stop for building fully featured, reliable and secure

applications with the nRF52 and nRF51 series. It offers developers a wealth of varied

modules and examples right across the spectrum including numerous Bluetooth Low

Energy profiles, Device Firmware Upgrade (DFU), GATT serializer and driver support for

all peripherals on all nRF5 Series devices.

SDKs for Bluetooth Mesh, Thread, Zigbee and other protocols are also available.

Nordic Semiconductor

nRF Connect for Desktop

nRF Connect is a cross-platform tool that enables testing and development with

Bluetooth® low energy (previously called Bluetooth Smart). It allows easy setup of

connections with other devices and uses these connections to read and write the

external nodes. Available for Windows, macOS, and Linux.

Nordic Semiconductor

nRF Connect for Mobile

nRF Connect for Mobile, previously known as nRF Master Control Panel, is a powerful

generic tool that allows you to scan and explore your Bluetooth low energy devices and

communicate with them. nRF Connect for Mobile supports several Bluetooth SIG

adopted profiles, as well as the Device Firmware Update profile (DFU) from Nordic

Semiconductor or Eddystone from Google. Available for iOS and Android.

Nordic Semiconductor

Mobile Apps

Additional mobile utilities for your application development. Available for iOS and

Android.

Table 1: Useful tools

EVK BMD-345 - User guide

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2Hardware description

Design files for the BMD-345 evaluation board may be requested from the u-blox support team.

Figure 2: Features (Top view)

2.1 Power

The BMD-345 evaluation board has four possible power sources:

•USB from the debug interface

•USB from the BMD-345 interface

•2.54 mm through-hole connector for connecting 3.3 V

•Lithium Polymer (LiPo) battery input

These power sources use protection diodes to prevent reverse voltage to any supply. This allows them

to be used simultaneously. Solder jumpers are provided to allow by-passing any of the protection

diodes eliminating the voltage drop across them.

⚠Care should be taken to not damage the supplies when the protection is by-passed.

2.1.1 Powering the board

During typical debugging, power will be provided by VBUS on the USB debug interface to supply 5 V to

the 3.3 V LDO regulator and to the shield connector. The 3.3 V LDO regulator will then power VIO,

VSHLD, and VBMD.

When powering the board from the external power header or the LiPo header, USB can be left

disconnected. In this configuration, the interface IC is held in reset to conserve power.

☞Only if the power protection diodes are left intact can the USB be safely connected at the same

time as the external power is still applied, which allows for easy programming of the module.

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Figure 3: Schematic – Power supply

2.2 Reset

The BMD-345 module has a configurable hardware reset. P0.18 is assumed to be used as the reset

pin for all BMD-345 and Nordic example projects, and thus the evaluation board hardware is

configured to use P0.18 as a reset. The Reset button can be configured to connect to an input on the

interface IC or to directly connect to P0.18.

The reset button is connected to the IC used for the J-Link interface by default. Pressing reset while

the interface IC is powered will cause a momentary reset signal on the RESET_N output of the

interface IC, which is connected via solder jumper to P0.18 of the BMD-345 module. If the reset button

is held down during EVK power on, it will cause the interface IC to enter its bootloader mode, allowing

either SEGGER J-Link programmer firmware to be programmed.

When the reset button is directly connected to P0.18, it can be used as a fifth user button or as a reset

button directly connected to the BMD-345 module.

Solder jumper J18 is used to connect P0.18 of the BMD-345 module to the RESET_N net. RESET_N

is connected to the interface IC and to the reset connections on the Arduino headers.

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Figure 4: Schematic – Reset

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2.3 Buttons

The evaluation board has four user buttons: Button 1, Button 2, Button 3, and Button 4. All buttons

are active low; they will connect to ground when pressed. The button GPIO pins must be configured

with internal pull-up resistors for proper operation when using the user buttons. The buttons and ESD

protection can be completely removed from the circuit by breaking the associated jumper.

Figure 5: Schematic – User buttons

2.4 LEDs

User LEDs are provided on the evaluation board - two red and two green. An RGB LED is included as

well and can be enabled by changing the position of JLED. LEDs are powered by VIO and are active

low. The GPIO should be enabled for high drive when sinking current for the LEDs. The LEDs can be

completely removed from the circuit by breaking the associated jumper.

Figure 6: Schematic – User LEDs

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2.5 Virtual COM port

The evaluation board allows for easy serial communication with the BMD-345 module and a connected

computer. The Interface IC provides a virtual COM port USB device that connects to four GPIO pins on

the module, allowing for UART communication with or without hardware flow control. The UART lines

can be isolated from the Interface IC by soldering the associated jumpers.

BMD-345 Pin Name BMD-345 Function Jumper Interface IC Function

P0.05 RTS JFC CTS

P0.06 TXD JDAT RXD

P0.07 CTS JFC RTS

P0.08 RXD JDAT TXD

Table 2: Virtual COM port connections

Figure 7: Interface IC UART circuit

2.6 32 kHz crystal oscillator

The evaluation board has a 32.768 kHz crystal oscillator connected to the BMD-345 module by

default. This allows the module to use any of the three available low frequency (LF) clock sources: an

internal calibrated RC oscillator, an internal synthesized clock (derived from the 32 MHz clock), or an

external crystal oscillator. The external crystal oscillator is the most accurate and lowest power LF

clock option. For applications without strict time keeping requirements, the internal calibrated RC

oscillator is often suitable. The crystal is connected to the module through a solder select jumper,

allowing either the crystal or the IO header to be connected to the module’s GPIO pins.

Figure 8: Schematic – 32 kHz crystal

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