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UMxxxx

USER MANUAL

Evaluation Board

STEVAL-WESU1

July 2015 Rev 0.1 STMicroelectronics Confidential 1/22

Introduction

The STEVAL-WESU1 is a System Evaluation Board designed to provide a cost effective solution

for precise motion sensing in wearable applications. The system is featuring a low power ARM

Cortex-M3 microcontroller unit (STM32L151), an iNEMO inertial module (LSM6DS3), a high

performance magnetometer (LIS3MDL), a barometric pressure sensor (LPS25HB), a Bluetooth®

low energy wireless network processor (BLUENRG-MS) and power management circuitry that

allows fast charging and precise energy estimation (STNS01 and STC3115). The connectivity

granted by the best in class BLUENRG-MS and supported by the integrated balun (BALF-NRG-

01D3) permit to maximize the RF performances with low area occupancy and design effort and

pass the RF Test for FCC certification (FCC ID: S9NWESU1) and IC certification (IC ID: 8976C-

WESU1).

An Android and iOS APP, available on Google Play and Apple Store, can be used for displaying

information sent by the STEVAL-WESU1 through BLE connectivity as well as for setting operative

modes.

Figure 1. STEVAL-WESU1 evaluation board

Summary of content (22 pages)

PAGE 1
UMxxxx USER MANUAL Evaluation Board STEVAL-WESU1 Introduction The STEVAL-WESU1 is a System Evaluation Board designed to provide a cost effective solution for precise motion sensing in wearable applications.
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Table of Contents 1 Board Description and Getting started ................................................................................... 4 1.1 2 Getting started ........................................................................................................................ 5 Hardware description ............................................................................................................... 8 2.1 Microcontroller ...............................................................
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Error! No text of specified style in document. ST application note template 1 Board Description and Getting started The STEVAL-WESU1 is a System Evaluation Board designed and optimized in order to be a reference design for users would made their own wearable electronic devices. In fact, the system architecture is made up of hardware, firmware and software solutions to accelerate the overall development of all applications: from embedded end-customer devices to mobile software development.
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ST application note template Error! No text of specified style in document. Figure 3. Block Diagram of RFIC: BlueNRG-MS DRAFT 1.1 Getting started The system is delivered fully assembled and connected with battery and with LDO off (shipment mode, with 2uA power consumption). It can be simply switched ON with USB-powered cable insertion (micro B male plug). The USB port connector can be used for battery charging.
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Error! No text of specified style in document. ST application note template A custom (1.27 mm pitch) SWD connector is used to have a compact solution, since to program the on-board STM32L151 it has been included in the package a specific adapter useful to be connected to a programmer tool (e.g. ST-LINK/v2). Figure 4. Board Layout – top layer DRAFT Figure 5. Board Layout – Bottom layer 6/22 Version 0.
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ST application note template Error! No text of specified style in document. Once it has been verified the battery is enough charged, the board is ready to be used. To visualize the information sent through the Bluetooth Low Energy connectivity is fundamental to install one of the App available for the Smartphone and Tablet: - ST WESU Android App, available on Google Play; - ST WESU iOS App available on Apple Store. To use this App is need a Smartphone or Tablet supporting the BLE connectivity, i.e.
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Error! No text of specified style in document. ST application note template 2 Hardware description This section describes the main components present on the board and described in Figure 3 and 4. 2.1 Microcontroller STM32L151VEY6 is an ultra-low-power microcontroller unit based on ARM Cortex M3. It features a great range of low power modes and an efficient voltage scaling that allows power saving. 2.
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ST application note template 2.2.3 Error! No text of specified style in document. LPS25HB The LPS25HB is an ultra-compact absolute piezo-resistive pressure sensor. It includes a monolithic sensing element and an IC interface able to take the information from the sensing element and to provide a digital signal to the external world.
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Error! No text of specified style in document. ST application note template The SYS pin is the voltage output of STNS01 selected power path. That SYS pin is connected to the linear voltage regulator STLQ015XG30R that provide a 3V (VDD) to all other devices. The STM32L151 is also connected to its SHDN pin to disconnect the power delivery to most of the devices and enable the shipment mode. 2.4.
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ST application note template 2.5.2 Error! No text of specified style in document. SWD Connector and external peripherals A custom 10 pin (1.27 mm pitch) connector is soldered.
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Error! No text of specified style in document. ST application note template 2.5.3 USB Connector The USB connector accepts a micro USB type B and it is used to charge the battery or to power the board if battery is not present. 2.5.4 Exposed pad connector STEVAL-WESU1 gives the possibility to reduce form factor by cutting PCB area hosting USB connector and expansion connector (see cutting line in 8). USB feature will be accessible by exposed pads on the bottom of the PCB (8).
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ST application note template Error! No text of specified style in document. 3 Formal notices required by the U.S. Federal Communications Commission ("FCC") Model: STEVAL-WESU1 FCC ID: S9NWESU1 Any changes or modifications to this equipment not expressly approved by STMicroelectronics may cause harmful interference and void the user’s authority to operate this equipment. This device complies with part 15 of the FCC rules. Operation is subject to the following two conditions: 1.
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Error! No text of specified style in document. ST application note template 4 Formal notices required by the Industry Canada ("IC") Model: STEVAL-WESU1 IC: 8976C-WESU1 English: This Class A or B digital apparatus complies with Canadian CS-03. Changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment. This device complies with Industry Canada licence-exempt RSS standard(s).
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Error! No text of specified style in document. ST application note template 5 Board schematic and bill of material This section contains the bill of material and layout of the STEVAL-WESU1 5.1 Bill of material BOM STEVAL-WESU1 Item Q.ty Reference Part/Value 2.
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Error! No text of specified style in document. ST application note template 7 1 C206 51pF NOT MOUNT 50V Ceramic C0G ±10% SMD 0402 Murata GRM1555C1H510GA01D 8 2 C212,C213 12p 50V CH ±0.1pF SMD 0201 Murata GRM0335C1H120GA01 9 2 C214,C221 100p 16V Ceramic X7R ±10% SMD 0201 Murata GRM033R71C101KD01D 10 2 C223,C224 Not Mount Not Mount Not Mount Not Mount SMD 0402 Murata Not Mount Mandatory Use Manuf.Code Marked Mandatory Use Manuf.Code Marked Mandatory Use Manuf.
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ST application note template Error! No text of specified style in document. mm pitch 24 1 L203 10uH 25 1 L204 0R OHM 26 1 27 3 28 4 29 10 30 5 31 20% ±0,1nH 3.9nH 1.
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Error! No text of specified style in document. 44 1 U201 45 1 U100 46 1 U200 47 1 U202 PUSHBUTT ON-DPST U.
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ST application note template Error! No text of specified style in document. 5.2 Schematic DRAFT STMicroelectronics Confidential Rev 0.
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Error! No text of specified style in document. ST application note template 6 Revision history Table 1: Table Title Revision Date of modification Description of modification 0.2 July 15 Initial draft 0.3 July 15 Modified version 0.4 July 15 Changed name in STEVAL-WESU1 DRAFT 20/22 Version 0.
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ST application note template Error! No text of specified style in document. DRAFT STMicroelectronics Confidential Rev 0.
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Error! No text of specified style in document. ST application note template Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale.