STMicroelectronics LIS331HHTR

Overview

LIS331HHTR from STMicroelectronics is a MEMS digital-output 3-axis ultra-low-power accelerometer with ±6g/±12g/±24g dynamically selectable full-scale range, 16-bit I²C/SPI output, and dual programmable interrupt engines. It operates from 2.16 V to 3.6 V, consumes as low as 10 µA in low-power mode, and delivers output data rates from 0.5 Hz to 1 kHz - enabling motion-triggered power management in battery-constrained handheld devices.

For engineers reviewing the LIS331HHTR datasheet, LIS331HHTR pinout, LIS331HHTR application, or LIS331HHTR equivalent, key selection criteria include its 6D orientation detection capability, embedded self-test function, 10000 g shock survivability, and LGA16 (3×3×1 mm) package compatibility with space-constrained PCB layouts.

Technical Context

The LIS331HHTR integrates a capacitive MEMS sensing element with a low-noise analog front-end, 16-bit sigma-delta ADC, and digital signal processing logic supporting high-pass filtering, sleep-to-wake transitions, and 6-axis orientation recognition. Its dual interrupt generators independently monitor acceleration thresholds and duration for inertial events on all three axes.

Communication is supported via I²C (standard/fast-mode up to 400 kHz) or 4-/3-wire SPI (up to 10 MHz), with configurable address pins (SA0) and mode-selectable CS pin. Factory calibration ensures ±70 mg zero-g offset accuracy and ±0.01 %/°C sensitivity stability across –40 °C to +85 °C.

Key Specifications

Pinout & Package

LIS331HHTR is housed in a 3 mm × 3 mm × 1 mm LGA16 (Land Grid Array) package with exposed pad for thermal and electrical grounding. The package is RoHS-compliant and qualified for industrial temperature operation (–40 °C to +85 °C).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 3-axis MEMS accelerometer applications.

Compared with LSM303AGRTR and ADXL345BRWZ-RL, the LIS331HHTR uniquely combines ultra-low 10 µA active current, dual interrupt engines with 6D orientation, and factory-trimmed ±70 mg offset - making it optimal for long-life, event-driven motion sensing where precision and robustness are prioritized over integrated magnetometry or minimal standby draw.

Availability

LIS331HHTR is available at Aetrix Electronics and suitable for pedometer development, gaming peripheral design, impact logging systems, and vibration monitoring solutions requiring stable component supply and industrial-grade temperature performance.

Supply support for LIS331HHTR 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, microcontrollers, power management, and automotive ICs.

The LIS331HHTR belongs to ST's "nano" family of ultra-low-power MEMS accelerometers, engineered specifically for energy-constrained portable electronics requiring reliable motion awareness, intelligent power cycling, and high mechanical ruggedness.

FAQ

What is the operating temperature range for LIS331HHTR?

The LIS331HHTR is specified to operate continuously from –40 °C to +85 °C. This extended industrial temperature range is validated across all electrical parameters including offset, sensitivity, and current consumption, ensuring consistent performance in outdoor wearables, automotive infotainment mounts, and factory-floor IoT sensors.

Does LIS331HHTR support both I²C and SPI simultaneously?

No - the LIS331HHTR uses a hardware mode-select pin (CS) to configure interface protocol: CS = high enables I²C mode; CS = low enables SPI mode. Both protocols share physical pins (SCL/SPC, SDA/SDI/SDO), so only one can be active at a time. This simplifies PCB routing but requires static interface selection at power-up.

How does the embedded self-test function verify sensor integrity?

The self-test applies electrostatic force to the MEMS proof mass, inducing a known displacement. The resulting output shift is measured in LSBs (e.g., +220 to +370 LSB on Z-axis at ±6g range) and compared against factory-stored reference values. This validates both mechanical integrity and analog signal chain functionality without external test equipment.

Can LIS331HHTR detect free-fall events reliably?

Yes - the dual interrupt engines support dedicated free-fall detection by configuring INT1_CFG or INT2_CFG to monitor all three axes for simultaneous acceleration below a programmable threshold (e.g., <0.1g) for a defined duration (e.g., 30 ms). This triggers an open-drain interrupt signal without host CPU involvement, enabling rapid system response.