STMicroelectronics IIS3DWBTR

Overview

IIS3DWBTR from STMicroelectronics is a 3-axis digital vibration sensor IC with ultrawide 6 kHz bandwidth (±3 dB), ultralow noise density (75 µg/√Hz in 3-axis mode), ±2/±4/±8/±16 g user-selectable full scale, embedded 3 KB FIFO, and SPI interface - designed for high-fidelity industrial vibration monitoring at extended temperature (-40°C to +105°C) and low power (1.1 mA).

For engineers reviewing the IIS3DWBTR datasheet, IIS3DWBTR pinout, IIS3DWBTR application, or IIS3DWBTR equivalent, this device delivers validated performance in battery-powered wireless sensor nodes, predictive maintenance systems, and high-stability condition monitoring where flat frequency response, thermal stability, and self-test capability are critical selection criteria.

Technical Context

The IIS3DWBTR integrates a MEMS sensing element with a dedicated CMOS interface ASIC, supporting simultaneous 3-axis sampling at 26.7 kHz ODR and configurable digital filtering (LPF/HPF). Its architecture includes dual-stage signal conditioning: analog front-end amplification followed by 16-bit ADC conversion and programmable digital filters.

It operates exclusively via SPI (3- or 4-wire, modes 0/3), with I²C support disabled by default due to throughput limitations; all advanced features-including FIFO management, interrupt generation (INT1/INT2), self-test activation, and axis selection-require SPI access and register-level configuration.

Key Specifications

Pinout & Package

Package: LGA-14L, 2.5 mm × 3.0 mm × 0.83 mm, RoHS and ECOPACK compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 3-axis industrial vibration sensing applications.

Compared with ADXL357BCEZ-RL7 and LSM6DSV16XTR, the IIS3DWBTR uniquely balances 6 kHz bandwidth, 75 µg/√Hz noise, 3 KB FIFO, and factory-calibrated thermal stability - making it the only option among the three qualified for unattended, long-term, high-fidelity industrial vibration monitoring at extended temperature.

Availability

IIS3DWBTR is available at Aetrix Electronics and suitable for predictive maintenance systems, wireless condition monitoring nodes, and industrial test equipment requiring stable component supply, extended temperature operation, and validated MEMS vibration performance.

Supply support for IIS3DWBTR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader specializing in MEMS sensors, microcontrollers, and power management ICs, with manufacturing rooted in proprietary micromachining and CMOS integration.

The IIS3DWBTR belongs to ST's high-performance industrial MEMS vibration sensor family, engineered specifically for demanding condition-based monitoring applications where bandwidth, noise, and thermal robustness outweigh consumer-grade cost or size constraints.

FAQ

What is the maximum SPI clock frequency supported by the IIS3DWBTR?

The IIS3DWBTR supports SPI clock frequencies up to 10 MHz, as verified in DS12569 Rev 8 Table 5. At this rate, the minimum SPC cycle time is 100 ns. Timing margins assume proper PCB layout with controlled-impedance traces, 100 nF local decoupling on VDD_IO, and adherence to setup/hold times (e.g., tsu(CS) = 5 ns, th(SI) = 15 ns). Exceeding 10 MHz risks register access corruption or missed interrupts.

Can the IIS3DWBTR operate reliably at +105°C continuously?

Yes - the IIS3DWBTR is qualified per HTOL@125°C for 1000 hours and specified for continuous operation from -40°C to +105°C. However, DS12569 Rev 8 Section 2.2 Note 6 recommends minimizing powered-on duty cycle above 50°C to maximize lifetime. For continuous +105°C use, thermal derating and periodic power cycling are advised to align with reliability trial extrapolation.

Does the embedded temperature sensor require calibration for accurate compensation?

The temperature sensor has ±15°C offset (min/max) and ±4°C delta accuracy post-OPC (one-point calibration at 25°C). For vibration data compensation, OPC at room temperature reduces offset impact; absolute temperature accuracy beyond that requires system-level calibration against a reference sensor, as factory trimming applies only to the accelerometer's sensitivity and zero-g level - not the temperature ADC's absolute accuracy.

Is I²C interface functionality fully supported on the IIS3DWBTR?

No - I²C is explicitly deprecated in the official documentation. DS12569 Rev 8 states "only the SPI interface supports all the device features and capabilities" and warns that I²C is limited to single-axis mode with reduced throughput and is "not recommended." Pin CS must be pulled high to enable I²C, but register access, FIFO, interrupts, and self-test are either unavailable or unreliable in I²C mode.