Analog Devices Inc. ADXL371BCCZ-RL

Overview

ADXL371BCCZ-RL from Analog Devices is an ultra-low-power, 3-axis ±200 g MEMS accelerometer with 12-bit digital output, 28 µA current draw at 2560 Hz ODR, and integrated FIFO for autonomous impact detection in portable IoT edge nodes and concussion monitoring systems.

For engineers reviewing the ADXL371BCCZ-RL datasheet, ADXL371BCCZ-RL pinout, ADXL371BCCZ-RL application, or ADXL371BCCZ-RL equivalent, this page delivers verified specifications, real-world use cases, pin-level circuit roles, power-mode trade-offs, and validated alternative options for high-g shock sensing designs.

Technical Context

The ADXL371BCCZ-RL implements a fully differential capacitive MEMS sensor core with polysilicon springs and phase-sensitive demodulation, enabling true DC-coupled acceleration measurement up to ±200 g without front-end power cycling. Its four-pole antialiasing filter supports user-selectable bandwidths from 160 Hz to 2560 Hz.

It integrates dual interrupt outputs (INT1/INT2) supporting synchronized sampling, external clock input, and autonomous wake-up logic-enabling instant-on impact capture in 1.25 ms and low-g activity detection via configurable high-pass filtering and threshold registers.

Key Specifications

Pinout & Package

ADXL371BCCZ-RL uses a 3 mm × 3.25 mm × 1.06 mm, 16-terminal LGA package (CC-16-4), optimized for space-constrained wearable and asset-tracking PCBs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-g shock sensing applications.

Compared with ADXL371BCCZ-RL, ADXL362BCCZ-RL trades bandwidth and impact responsiveness for marginally lower standby power, while LSM6DSOXTR adds gyroscope functionality at significantly higher power cost and reduced autonomy in shock detection.

Availability

ADXL371BCCZ-RL is available at Aetrix Electronics and suitable for portable IoT edge nodes, asset health monitoring systems, and concussion assessment devices requiring stable component supply across long-lifecycle deployments.

Supply support for ADXL371BCCZ-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 and power management.

The ADXL371 product line targets ultra-low-power, high-g MEMS sensing for battery-operated edge devices where impact detection latency, energy efficiency, and autonomous operation are critical design constraints.

FAQ

What is the minimum detectable impact threshold for ADXL371BCCZ-RL in instant-on mode?

The ADXL371BCCZ-RL supports user-configurable impact thresholds with a default target range of 10 g to 15 g. The threshold can be increased via register programming to a target of 30 g to 40 g for higher immunity to false triggers. This adjustment is implemented through the X/Y/Z-Axis Activity Threshold Registers, allowing per-axis tuning. The ADXL371BCCZ-RL achieves this detection while consuming only 1.7 µA in instant-on mode, making it ideal for always-on shock monitoring.

Does ADXL371BCCZ-RL support both SPI and I²C interfaces simultaneously?

No, ADXL371BCCZ-RL does not support simultaneous SPI and I²C operation. The device uses shared pins (MOSI/SDA and CS/SCL) that are functionally multiplexed-SPI mode is selected when CS is asserted, and I²C mode activates when SCL/SDA signaling is detected. Only one interface can be active at a time, and configuration must be consistent across power cycles. The ADXL371BCCZ-RL datasheet specifies separate timing and electrical parameters for each protocol to ensure reliable communication in either mode.

How does the ADXL371BCCZ-RL prevent aliasing at high output data rates?

The ADXL371BCCZ-RL prevents aliasing using a fixed four-pole, low-pass antialiasing filter with a user-selectable −3 dB corner frequency ranging from 160 Hz to 2560 Hz. Unlike architectures that rely on power cycling or undersampling, the ADXL371BCCZ-RL maintains continuous front-end operation, ensuring accurate representation of broadband shock content without spectral folding. This design eliminates risk of missing high-frequency transients common in impact events, directly supporting its ±200 g measurement range.

What is the FIFO depth and operational modes supported by ADXL371BCCZ-RL?

The ADXL371BCCZ-RL features a 512-sample deep FIFO with three configurable modes: Stream Mode (stores last N samples), Triggered Mode (captures N samples around an interrupt event), and Oldest Saved Mode (first N samples). Each sample is 12-bit per axis, and FIFO access is managed via dedicated registers including FIFO_SAMPLES and FIFO_CONTROL. The ADXL371BCCZ-RL uses FIFO watermark and overrun interrupts to minimize host intervention, enabling efficient burst readouts without continuous polling.

Can ADXL371BCCZ-RL operate from a 2.5 V supply while maintaining full ±200 g range and accuracy?

Yes, ADXL371BCCZ-RL operates across 2.5 V to 3.5 V with full specification compliance, including ±200 g range, 12-bit resolution, and 100 mg/LSB scale factor. At 2.5 V, 0 g offset increases to ±8 g (vs. ±3 g at 3.3 V), and current consumption scales linearly-28 µA at 2560 Hz ODR remains valid across the entire voltage range. The ADXL371BCCZ-RL's PSRR is characterized from 100 Hz to 250 kHz, ensuring stable performance even with noisy battery-derived supplies.