ST STEVAL-STWINBX1 - User Manual

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Overview

Function Description
Important Technical Specifications
Usage Features
Maintenance Features

The STWIN.box (STEVAL-STWINBX1) is a development kit and reference design engineered to streamline the prototyping and testing of advanced industrial sensing applications within IoT contexts, particularly for condition monitoring and predictive maintenance. This kit represents an evolution of the original STWIN kit (STEVAL-STWINKT1B), offering enhanced mechanical accuracy in vibration measurements, improved robustness, an updated Bill of Materials (BoM) with the latest and best-in-class MCU and industrial sensors, and a user-friendly interface for external add-ons.

Function Description

The STWIN.box serves as a multisensing wireless platform for vibration monitoring and ultrasound detection. It is built around a core system board that integrates processing, sensing, connectivity, and expansion capabilities. The kit supports a broad range of industrial IoT applications, including ultra-low power operation, 9 DoF motion sensing, wide-bandwidth vibration analysis, audio and ultrasound acoustic inspection, very precise local temperature measurement, and environmental monitoring. It comes with a rich set of software packages in source code, optimized firmware libraries, and a complete companion cloud application to accelerate the design cycle for end-to-end solutions.

Important Technical Specifications

Core System: The heart of the STWIN.box is an ultra-low power Arm® Cortex®-M33 microcontroller (STM32U585AI) with FPU and TrustZone, operating at 160 MHz and featuring 2048 kBytes of Flash memory.
Memory: Includes a MicroSD card slot for standalone data logging applications.
Connectivity: Offers diverse options such as on-board Bluetooth® low energy v5.0 wireless technology (BlueNRG-M2), Wi-Fi (EMW3080), NFC (ST25DV04K), and a built-in RS485 transceiver.
Security: Provides an option to implement authentication and brand protection secure solutions with STSAFE-A110.
Power Management: Features a 480 mAh 3.7 V LiPo battery, STBC02AJR Li-Ion linear battery charger, ST1PS02CQ 400 mA synchronous step-down converters, LDLN025PU275R 250 mA ultra-low noise LDO, and STEF05SGR electronic fuse for 5 V line. It supports power supply via USB Type-C™ (sink only, 5 V) or J5 connector (4.8-5.5 V).
Sensors:
- Vibration: IIS3DWB (ultra-wide bandwidth up to 6 kHz, low-noise, 3-axis digital vibration sensor).
- Inertial Measurement Unit (IMU): ISM330DHCX (3D accelerometer + 3D gyro with Machine Learning Core).
- Accelerometer: IIS2DLPC (high-performance ultra-low-power 3-axis accelerometer for industrial applications), IIS2ICLX (high-accuracy, high-resolution, low-power, 2-axis digital inclinometer with Embedded Machine Learning Core).
- Magnetometer: IIS2MDC (ultra-low power 3-axis digital magnetic sensor).
- Barometer: ILPS22QS (dual full-scale, 1.26 bar and 4 bar, absolute digital output barometer).
- Temperature: STTS22H (low-voltage, ultra low-power, 0.5°C accuracy I²C/SMBus 3.0 temperature sensor).
- Microphones: IMP34DT05 (industrial grade digital MEMS microphone), IMP23ABSU (analog MEMS microphone with frequency response up to 80 kHz).
Expansion: Expandable via a 34-pin FPC connector, supporting daughter boards like the STEVAL-C34KAT1 vibrometer and temperature sensors expansion board.
Dimensions: The core system board is designed to fit into a plastic case, which consists of a bottom case and a cover.
Operating Temperature: Intended to work properly with an operating temperature of 35°C when battery-powered, and 45°C without the battery.
ESD Protection: USBLC6-2P6 low capacitance ESD protection for USB.

Usage Features

Easy Assembly: The kit includes a plastic case, four screws, a 480 mAh LiPo battery, an ST-LINK adapter with a programming cable, and an adapter board for DIL24 sensors with a flexible cable. The battery is placed in a dedicated slot inside the bottom case and connected to the core system board via the BATT connector. The core system board then fits into the bottom case, and the plastic case is closed with the cover and screws.
User Interface: The plastic case cover provides access to three buttons: USR, RESET, and BOOT.
Firmware Programming (USB Mode): For simple binary downloads without debugging, the STWIN.box can be programmed via USB. Users unplug the board, press the USR button, and while holding it, connect the USB Type-C™ cable to a PC with STM32CubeProgrammer installed. The board automatically enters DFU mode and is recognized by the PC. Firmware can then be upgraded by selecting the USB port in STM32CubeProgrammer and connecting.
Firmware Programming (External Debugger): For more advanced debugging and programming, an external debugger like ST-LINK V2-1 (STM32 Nucleo development board) or a standard JTAG connector can be used. The kit includes a STEVAL-MKIGIBV4 ST-LINK adapter. To use an external debugger, two jumpers on CN2 must be disconnected. Users can download sample application binaries or recompile and flash provided projects using preferred IDEs (STM32CubeIDE, EWARM, or Keil®).
Default Application: The core system board is preprogrammed with a default application from the FP-SNS-STBOX1 function pack. This application supports the STBLESensor app (Android and iOS), Bluetooth® Low Energy pairing via NFC, over-the-air firmware upgrades via Bluetooth® Low Energy, and environmental sensor data streaming.
Mobile App Integration: To get started with the default application, users install the STBLESensor app on their smartphone, enable Bluetooth® Low Energy and NFC, and place the smartphone on the STWIN.box's NFC antenna. The app automatically loads pairing information and displays environmental data. Firmware can also be upgraded directly via the mobile app.
Power On/Off: When powered by a LiPo battery, the board is turned on by pushing the PWR button for about a second (managed by the STBC02 battery charger). To turn off, the PWR button is pushed again, and the STM32 software detects this action to send a shutdown command to the battery charger. If not battery-powered, the board turns on/off with external supply connection/disconnection.
Power Consumption Evaluation: The STWIN.box includes test points and jumpers for monitoring electrical performance. Four resistors (R46, R47, R48, R49) monitor current consumption in the 3V3_SENSORS, VDD_UC, VDD_BLE, and VDD_WIFI domains. Removing these resistors allows connecting an ammeter for precise measurement. Two solder bridges (SB15, SB18) are also in series with the output of the two DC-DC regulators.

Maintenance Features

Battery Charging: The device must be charged with a DC 5 V–500 mA USB charger at temperatures between 10°C and 35°C. The STBC02 battery charger automatically checks available power inputs and selects one to power the system and charge the battery.
Battery Safety: Only the provided LiPo battery (HiMax 752535) should be used. Incorrect battery types can defeat safeguards. LiPo batteries can be damaged or explode if short-circuited, overcharged, or improperly used (e.g., mechanical crushes, high heat, cutting).
Environmental Operating Range: The kit must be used within its specified working temperature range and never exposed to excessive heat, direct sunlight, fire, or heating equipment.
USB Charger Safety: Only USB chargers equipped with short-circuit protections should be used to prevent fire hazards.
Sensor Self-Test: Sensors like the IIS3DWB and IIS2DLPC include self-test capabilities to verify correct operation in the final application.
Firmware Updates: Firmware can be updated via USB mode using STM32CubeProgrammer or over-the-air via the STBLESensor mobile app.
Regulatory Compliance: The kit complies with relevant regulatory standards, including FCC (for evaluation only, not for resale), Industry Canada (IC), EU Directive 2014/53/EU (RED), EU Directive 2015/863/EU (RoHS), and UK Radio Equipment Regulations 2017.