Analog Devices Inc. ADXL372BCCZ-RL

Overview

ADXL372BCCZ-RL from Analog Devices is an ultralow-power, 3-axis ±200 g MEMS accelerometer with 12-bit digital output, 3200 Hz ODR, and 22 µA typical supply current at 2.5 V. It features autonomous wake-up and instant-on impact detection modes, a 4-pole antialiasing filter, and SPI/I²C interfaces - deployed in portable IoT edge nodes for shock event capture.

For engineers reviewing the ADXL372BCCZ-RL datasheet, ADXL372BCCZ-RL pinout, ADXL372BCCZ-RL application, or ADXL372BCCZ-RL equivalent, key selection criteria include its 1.4 µA instant-on mode, peak acceleration capture capability, 100 mg/LSB scale factor, −40°C to +105°C operating range, and 3 mm × 3.25 mm × 1.06 mm LFCSP package.

Technical Context

The ADXL372BCCZ-RL integrates a polysilicon surface-micromachined sensing element with differential capacitive readout and phase-sensitive demodulation. Its measurement path includes a user-selectable 4-pole low-pass antialiasing filter (200–3200 Hz) and a configurable first-order high-pass IIR filter (0.24–30.48 Hz).

Three autonomous operating modes are implemented in hardware: continuous measurement mode (22 µA @ 3200 Hz), instant-on impact detection (1.4 µA, <1 ms wake-up), and wake-up mode (0.77–5.8 µA, programmable timer). All modes support deep FIFO buffering, peak acceleration storage, and interrupt-driven host notification without processor polling.

Key Specifications

Pinout & Package

ADXL372BCCZ-RL uses a 16-lead, 3 mm × 3.25 mm × 1.06 mm leadframe chip-scale package (LFCSP) with exposed pad for thermal and electrical grounding. Pin 1 is marked by a dot; pins 2, 5, 10, and 15 are NC or reserved; pins 12, 13, and 16 are GND; VS and VDDI/O are separate supply domains.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-g, ultralow-power accelerometer applications.

Compared with ADXL372BCCZ-RL, ADXL362BCCZ-RL offers better low-g resolution but cannot capture high-speed transients autonomously, while ICM-42688-P adds gyro functionality at 2.3× higher active current and no hardware-accelerated peak storage - making ADXL372BCCZ-RL uniquely suited for battery-powered impact forensics.

Availability

ADXL372BCCZ-RL is available at Aetrix Electronics and suitable for impact detection in industrial assets, concussion monitoring in wearables, and asset health assessment in logistics requiring stable component supply and long-term lifecycle support.

Supply support for ADXL372BCCZ-RL 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

Analog Devices is a global semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision sensing, power management, and connectivity.

The ADXL372 product line was designed specifically for battery-constrained, high-g event detection applications - emphasizing autonomous operation, ultra-low quiescent current, and robust MEMS performance across extended temperature ranges.

FAQ

What is the minimum detectable impact threshold in instant-on mode for ADXL372BCCZ-RL?

The ADXL372BCCZ-RL supports two programmable instant-on thresholds: a default target of 10 g ±5 g and an elevated option of 30 g ±10 g. These thresholds are set via the X/Y/Z-Axis Activity Threshold Registers and apply independently per axis. The device achieves <1 ms transition from instant-on to full measurement mode upon threshold breach, ensuring transient capture integrity.

Does ADXL372BCCZ-RL support true simultaneous sampling across all three axes?

Yes, ADXL372BCCZ-RL performs true simultaneous sampling of X, Y, and Z axes using a shared internal timing engine. Each axis conversion is aligned to the same ODR clock edge, eliminating inter-axis phase skew. This is confirmed in the Functional Block Diagram and Theory of Operation section, where the ADC and digital filters operate on a unified sample clock derived from the internal oscillator or external trigger.

Can ADXL372BCCZ-RL operate reliably from a 1.8 V supply?

Yes, ADXL372BCCZ-RL operates across a 1.6 V to 3.5 V supply range for both VS (analog/core) and VDDI/O (digital I/O). At 1.8 V, typical supply current remains 22 µA at 3200 Hz ODR, and all specifications - including noise (3.5 LSB RMS), offset (±7 g), and temperature range (−40°C to +105°C) - are fully guaranteed per the Absolute Maximum Ratings and Electrical Characteristics tables.

How does the ADXL372BCCZ-RL FIFO handle overflow during sustained high-g events?

The ADXL372BCCZ-RL FIFO implements configurable overflow behavior via the FIFO Control Register. When enabled, it can overwrite oldest data (circular buffer mode) or stop accepting new samples (stop-on-full mode). Overflow status is flagged in the Status Register (FIFO_FULL bit), and an interrupt can be generated on INT1 or INT2. No data corruption occurs - only controlled discard or halt based on register configuration.

Is external clock synchronization supported on ADXL372BCCZ-RL, and how is it implemented?

Yes, ADXL372BCCZ-RL supports external clock synchronization via the INT1 pin. When configured as an external clock input (using the EXT_CLK_EN bit in the MEASURE_CTL register), the device locks its ODR to the applied clock signal - enabling precise timing alignment across multiple ADXL372BCCZ-RL units or with host system clocks. This is documented in the "Synchronized Data Sampling" subsection of the Theory of Operation.