**ADXL343BCCZ-RL7: A Comprehensive Technical Overview of the Ultra-Low Power, 3-Axis MEMS Accelerometer**

The ADXL343BCCZ-RL7 from Analog Devices represents a pinnacle of integration and efficiency in the realm of micro-electromechanical systems (MEMS). As a low-voltage, ultra-low power, complete 3-axis accelerometer, it is engineered for a broad spectrum of applications, from consumer electronics and industrial instrumentation to wearable devices and IoT endpoints. Its combination of high resolution, embedded intelligence, and minimal power consumption makes it a cornerstone component for modern motion-sensing solutions.

At its core, the ADXL343 measures acceleration with a user-selectable full-scale range of ±2g, ±4g, ±8g, or ±16g, providing the flexibility needed for both high-sensitivity and high-dynamic-range applications. The device delivers its output as a **13-bit digital value** through either an SPI (3- or 4-wire) or I²C digital interface, allowing for easy connection to a wide array of microcontrollers. A key performance metric is its low noise density, typically **150 µg/√Hz**, enabling the detection of even the most subtle motions and inclinations.

The defining characteristic of the ADXL343 is its **ultra-low power consumption**. It operates on a single supply from 2.0 V to 3.6 V and features a selectable output data rate (ODR). In a typical use case at a 100 Hz ODR, the device consumes a mere **23 µA**, making it exceptionally suitable for battery-powered applications where longevity is paramount. Furthermore, it includes an advanced power-saving mode that can reduce consumption to below 10 µA, alongside a **deeply embedded FIFO (First-In, First-Out) memory** block. This 32-level FIFO can store data to minimize host processor intervention, allowing the main MCU to remain in a sleep mode for extended periods, thereby drastically reducing the system's total power budget.

Beyond raw data acquisition, the ADXL343 is equipped with a suite of **on-chip motion detection features**. These include activity and inactivity sensing, as well as free-fall detection, which are all programmable with configurable thresholds and timing parameters. These functions can be mapped to two interrupt output pins, enabling the accelerometer to autonomously "wake up" a host system upon detecting a specific event, a critical capability for always-on applications.

The device is housed in a compact, RoHS-compliant **3 mm × 5 mm × 1 mm LGA package**, offering a robust yet miniature footprint for space-constrained PCB designs. Its operational temperature range of -40°C to +85°C ensures reliable performance across challenging environmental conditions.

**ICGOOODFIND**: The ADXL343BCCZ-RL7 stands out as a premier solution for designers seeking a fusion of high-resolution motion sensing and extreme power efficiency. Its integrated intelligence, including the FIFO and interrupt-driven motion detection, empowers the creation of sophisticated, power-aware systems that can operate autonomously for years on a single battery. For applications demanding precise motion data with minimal energy expenditure, the ADXL343 remains an industry benchmark.

**Keywords**: **MEMS Accelerometer**, **Ultra-Low Power**, **Digital Output**, **FIFO Memory**, **Motion Detection**