User's Manual

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STMicroelectronics Confidential Rev 0.1 4/22
DRAFT
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. The design choices have been taken to address accurate motion tracking suitable
for training in every kind of activity or sport.
Main Components:
- STM32L151VEY6, ultra-low-power ARM Cortex-M3 MCU with 512 Kbytes FLASH, 48kBytes of
RAM in WLCSP100 package
- BLUENRG-MS, Bluetooth Low Energy (BLE) single-mode network processor, compliant with
Bluetooth specification core 4.0
- BALF-NRG-01D3, 50 Ω balun for BLUENRG-MS transceiver with integrated harmonic filter
- LSM6DS3, iNEMO inertial module 3D accelerometer (±2/4/8g) + 3D gyroscope
(±245/500/2000dps)
- LIS3MDL, MEMS 3D magnetometer (±4/8/12/16 gauss)
- LPS25HB, MEMS pressure sensor, 260-1260 hPa absolute digital output barometer
- STC3115, Gas gauge IC with alarm output
- STNS01, Li-Ion linear battery charger
- STLQ015XG30R, linear voltage regulator
The Figure 2 shows a function block diagram of the board where the sensors and the BLUENRG-
MS are connected to microcontroller through two separate SPI peripherals, meanwhile the power
management is driven by I2C peripheral. The system can be powered with USB connected to PC
or through specific battery. The USB is also used for battery recharge. Figure 3 shows the block
diagram of the RFIC BLUENRG-MS.
Figure 2. Functional Block Diagram