ADXL345BCCZ 3-Axis Digital Accelerometer for Motion Detection

ElecSuppliers Part Number GuideAug 22, 2026

ADXL345BCCZ is a 3-axis digital accelerometer designed to measure acceleration along the X, Y and Z axes. It can detect changes in movement, tilt, vibration, impact and orientation, making it useful for embedded systems that need compact motion sensing.

The device supports selectable measurement ranges from ±2g to ±16g and provides digital communication through I2C or SPI. Its combination of low power consumption, configurable measurement range and built-in motion detection functions makes it suitable for a wide range of portable and embedded products.

What Is ADXL345BCCZ?

ADXL345BCCZ is a MEMS-based digital accelerometer from Analog Devices.

Unlike an analog accelerometer that provides a continuously varying voltage, ADXL345BCCZ processes acceleration internally and provides digital measurement data to the host controller.

The sensor measures acceleration independently on three axes.

The X-axis can detect movement along one direction, the Y-axis detects movement along another, and the Z-axis provides information about acceleration perpendicular to the other two axes.

Together, these measurements allow an embedded system to determine movement and orientation.

ADXL345BCCZ Measurement Range

One of the useful characteristics of ADXL345BCCZ is its selectable acceleration range.

The available ranges are:

±2g

±4g

±8g

±16g

A lower range provides better sensitivity for applications measuring relatively small changes in acceleration.

A higher range is more appropriate when the sensor may experience stronger shocks or rapid movement.

For example, a tilt-sensing application may benefit from the lower measurement range, while an impact-detection system may require a higher range.

Selecting the correct range is therefore an important part of sensor configuration.

ADXL345BCCZ Resolution

ADXL345BCCZ provides a fixed 10-bit resolution mode and a full-resolution mode that increases resolution as the measurement range increases.

In full-resolution operation, the device can provide up to 13-bit resolution at the ±16g range.

The scale factor in full-resolution operation remains approximately 4 mg per LSB across the different measurement ranges.

This allows the sensor to maintain useful resolution while expanding the measurable acceleration range.

For applications where small changes in orientation need to be detected, the resolution and selected range should be considered together.

ADXL345BCCZ I2C and SPI Interface

ADXL345BCCZ supports both I2C and SPI communication.

This gives designers flexibility when integrating the accelerometer with a microcontroller.

I2C can be convenient when the system already contains several I2C peripherals and the number of available MCU pins is limited.

SPI can be useful when the application requires a faster serial interface or already uses SPI for other sensors.

The choice between the two interfaces depends on the host processor, system architecture and required data rate.

ADXL345BCCZ Motion Detection

ADXL345BCCZ includes several built-in functions designed to detect motion events.

These include activity detection, inactivity detection, single-tap detection, double-tap detection and free-fall detection.

These functions allow some motion decisions to be handled by the sensor rather than requiring the microcontroller to continuously process raw acceleration data.

This can reduce processor workload and can be particularly useful in battery-powered equipment.

ADXL345BCCZ Tilt Detection

An accelerometer can measure the static acceleration caused by gravity, which makes it possible to estimate device orientation when the system is stationary or moving slowly.

ADXL345BCCZ can therefore be used for tilt and inclination detection.

The host controller can read the X, Y and Z acceleration values and calculate the orientation of the device.

This approach can be used in control panels, handheld equipment, electronic instruments and other systems where the orientation of a product needs to be monitored.

ADXL345BCCZ Free-Fall Detection

Free-fall detection is another application where the built-in motion functions can be useful.

When an object enters free fall, the acceleration measured along its axes changes significantly.

ADXL345BCCZ can detect a configured free-fall condition and generate an interrupt for the host controller.

This can be useful in portable electronic products where the system needs to react to a possible drop.

For example, a device could use the event to protect sensitive mechanical components or save important operating information before impact.

ADXL345BCCZ Tap Detection

The sensor can also detect single and double tap events.

Tap detection can provide a simple user-interface mechanism without requiring a mechanical button.

A product could interpret a tap on its enclosure as a wake-up command, control input or mode-selection event.

Because the detection can be performed within the sensor, the MCU does not need to continuously analyze every acceleration sample.

ADXL345BCCZ Low-Power Operation

Power consumption is an important consideration for motion sensors used in portable products.

ADXL345 supports low-power operating modes and can reduce power consumption when continuous measurement is not required.

The device can also be configured with different output data rates according to the application.

A low-power system may use a lower data rate during normal operation and increase the measurement rate when motion is detected.

This type of architecture can help balance battery life and motion-detection performance.

ADXL345BCCZ Output Data Rate

The accelerometer provides configurable output data rates.

The appropriate rate depends on the type of movement being measured.

A slow-changing orientation measurement does not require the same data rate as vibration or impact detection.

For tilt sensing, a relatively low data rate may be sufficient.

For faster movement, shock detection or vibration analysis, a higher rate may be required.

Choosing an unnecessarily high data rate can increase power consumption and generate more data for the host processor to handle.

ADXL345BCCZ Interrupts

Interrupt outputs allow the accelerometer to notify the microcontroller when a configured event occurs.

For example, the sensor can generate an interrupt when activity, inactivity, free fall or a tap event is detected.

This is particularly useful for low-power systems.

Instead of continuously polling the accelerometer, the MCU can remain in a low-power state and respond when the sensor detects a relevant event.

The interrupt system can therefore be an important part of the overall power-management architecture.

ADXL345BCCZ Package

ADXL345BCCZ is supplied in a 14-lead LGA package measuring approximately 5 mm by 3 mm.

The compact package is suitable for space-constrained embedded products.

However, LGA packages require more careful PCB assembly and layout than larger through-hole packages.

The orientation of the sensor on the PCB is also important because the physical X, Y and Z axes correspond to the orientation of the package.

The PCB designer should therefore confirm the sensor orientation before defining the mechanical coordinate system.

ADXL345BCCZ PCB Design

Because ADXL345BCCZ is a motion sensor, mechanical PCB design can affect measurement performance.

The sensor should be positioned where the mechanical movement of the PCB represents the movement that needs to be measured.

Unnecessary mechanical stress, excessive vibration and poorly controlled mounting conditions can affect the sensor output.

The PCB should also provide appropriate power-supply decoupling and clean digital signal routing.

For precision motion applications, the sensor's physical placement should be considered together with the enclosure and mounting structure.

ADXL345BCCZ Applications

ADXL345BCCZ can be used in many applications involving movement and orientation.

Typical applications include handheld electronics, portable instruments, gaming controllers, industrial equipment, robotics, vibration monitoring, drop detection and user-interface devices.

Its built-in motion detection functions also make it useful in products where the MCU needs to respond to motion events without continuously processing raw acceleration data.

ADXL345BCCZ for Robotics

Robotics systems can use three-axis acceleration measurements to monitor movement and orientation.

ADXL345BCCZ can provide acceleration information to a robot controller through I2C or SPI.

For simple motion sensing, orientation monitoring or event detection, the sensor can be integrated with an MCU without requiring an analog signal-conditioning circuit.

More advanced robotic systems may combine accelerometer data with gyroscope or magnetometer information to obtain a more complete estimate of orientation.

ADXL345BCCZ for Portable Electronics

Portable devices often need to detect whether they are moving, stationary or being dropped.

ADXL345BCCZ can provide these functions in a compact digital sensor.

A system can use inactivity detection to enter a lower-power mode and activity detection to wake the system when movement begins.

Tap detection can also be used as a simple user-interface input.

These functions make the device useful in battery-powered electronics where both sensor size and energy consumption are important.

ADXL345BCCZ Alternative

When looking for an ADXL345BCCZ alternative, engineers should compare more than the acceleration range.

Important parameters include the number of sensing axes, measurement range, resolution, interface type, supply voltage, current consumption, interrupt functions, package and PCB footprint.

A sensor with a similar ±16g range may still require firmware changes if its register architecture is different.

Likewise, a physically similar LGA accelerometer may have a different axis orientation or pin configuration.

For an existing design, both electrical and software compatibility should therefore be checked.

ADXL345BCCZ Replacement

A replacement for ADXL345BCCZ should be selected according to the application's actual motion requirements.

For a simple tilt sensor, resolution and low-power operation may be more important than maximum acceleration range.

For impact detection, a higher measurement range and appropriate response time become more important.

For a compact consumer product, package size and axis orientation can be critical.

For an existing production board, the replacement must also be evaluated for footprint compatibility and communication interface compatibility.

Choosing ADXL345BCCZ

ADXL345BCCZ is a practical choice when an embedded system needs a compact three-axis digital accelerometer with selectable measurement ranges and both I2C and SPI interfaces.

Its motion-detection functions can reduce the amount of processing required from the host MCU, while its low-power modes make it suitable for portable products.

For new designs, the main selection factors are measurement range, resolution, data rate, power consumption, interface and package.

For replacement projects, engineers should additionally verify axis orientation, register compatibility, interrupt behavior and PCB footprint before selecting another accelerometer.