STMicroelectronics I3G4250DTR

Overview

I3G4250DTR from STMicroelectronics is a low-power, 3-axis digital-output gyroscope with ±245/±500/±2000 dps selectable full-scale range, 16-bit angular rate output, embedded FIFO, and integrated temperature sensor. It delivers ultrastable zero-rate level and sensitivity over temperature (−40°C to +85°C) and time, enabling high-accuracy motion sensing in compact industrial and navigation systems.

For engineers reviewing the I3G4250DTR datasheet, I3G4250DTR pinout, I3G4250DTR application, or I3G4250DTR equivalent, key selection criteria include its dual I²C/SPI interface support, programmable interrupt outputs (INT1, DRDY/INT2), PLLFILT-configurable bandwidth, low-power sleep mode (1.5 mA), and LGA-16 package compatibility with space-constrained PCB layouts.

Technical Context

The I3G4250DTR integrates a micromachined silicon sensing element with a CMOS ASIC interface, using a single-driving mass architecture to minimize cross-axis coupling and thermal drift. Its digital signal chain includes configurable low-pass and high-pass filters, a 32-slot × 16-bit × 3-channel FIFO, and on-chip ADCs delivering 16-bit angular rate data at ODRs of 105/208/420/840 Hz.

It supports both 3-wire and 4-wire SPI (up to 10 MHz) and I²C (standard/fast mode), with CS pin selecting interface mode and SDO/SA0 enabling dual-device I²C addressing. The PLLFILT pin requires external RC network (10 nF / 470 nF / 10 kΩ) to stabilize phase-locked loop timing for consistent drive-sense synchronization.

Key Specifications

Pinout & Package

Package: LGA-16L (4 mm × 4 mm × 1.1 mm), RoHS-compliant ECOPACK, land grid array with exposed pad for thermal dissipation and mechanical stability.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 3-axis digital gyroscope applications.

Compared with LSM6DSOXTR and ADXRS649WBRDZ-RL, the I3G4250DTR provides superior zero-rate stability (±0.03 dps/°C) and simplified layout (no external oscillator or analog signal conditioning), making it optimal for cost-sensitive industrial motion control where long-term bias drift must be minimized.

Availability

I3G4250DTR is available at Aetrix Electronics and suitable for industrial motion monitoring, navigation system stabilization, human-machine interface (HMI), and appliance motion control requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for I3G4250DTR 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 headquartered in Geneva, Switzerland, specializing in MEMS sensors, microcontrollers, and power management ICs for industrial, automotive, and consumer markets.

The I3G4250DTR belongs to ST's high-stability MEMS motion sensor product line, designed specifically for applications demanding minimal zero-rate drift and long-term sensitivity consistency without runtime compensation.

FAQ

What is the function of the PLLFILT pin, and why is an external RC network required?

The PLLFILT pin connects to an external second-order low-pass filter (10 nF / 470 nF / 10 kΩ) to stabilize the phase-locked loop that synchronizes the MEMS driving and sensing interfaces. This ensures consistent resonance frequency and minimizes jitter-induced angular rate errors. Without this network, the gyroscope fails to achieve specified stability and may exhibit erratic output or lock failure.

How does the FIFO operate in stream mode versus FIFO mode, and when should each be used?

In stream mode, the 32-slot FIFO discards oldest data when full, enabling continuous motion capture without host intervention-ideal for real-time gesture or vibration analysis. In FIFO mode, data collection halts when full, requiring explicit host reset-better for deterministic burst reads in closed-loop control. Bypass mode disables FIFO entirely for lowest-latency single-sample reads.

Can the I3G4250DTR interface with a 1.8 V microcontroller without level shifters?

Yes. The Vdd_IO pin accepts 1.71–Vdd+0.1 V, and all I/O pins (SCL/SPC, SDA/SDI/SDO, SDO/SA0, INT1, DRDY/INT2) are 1.8 V compatible. When Vdd_IO = 1.8 V, the device operates fully with 1.8 V logic levels, eliminating external level shifters while maintaining signal integrity and timing compliance per I²C fast-mode and SPI 10 MHz specs.

What is the significance of the self-test output value (e.g., 130 dps at ±245 dps FS), and how is it verified?

The self-test output (130 dps at ±245 dps FS) confirms functional integrity of the MEMS structure and signal chain by electrostatically actuating the sensing mass and measuring resulting angular rate response. It is factory-calibrated and guaranteed across temperature; verification requires reading the OUT_X/Y/Z registers after issuing the self-test command (CTRL_REG1[2] = 1) and confirming output falls within ±20% of nominal value.