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When designing wearable devices, the selection of an accelerometer directly affects the product's battery life and size. However, with so many items listed on data sheets, some designers may be left wondering, "What specs affect what parts of the product?" Many designers are also considering reconsidering their accelerometers in order to realize smaller wearable devices with lower power consumption.
This time, we will introduce the ADXL366, an acceleration sensor made by Analog Devices for wearable devices. If you want to know how to choose an acceleration sensor for wearable devices, please read on.
ADXL366 Product Overview
Analog Devices has been providing accelerometers for over 30 years. In the past, their main target was applications such as detecting large impacts in automotive airbags, but in recent years they have been increasingly used to detect human movement in wearable devices and IoT.
In these battery-powered applications, the accelerometer must not only be small and low power consuming, but also must be able to improve the efficiency of the entire system.
The ADXL366 introduced here features industry-leading ultra-low power consumption, significantly extending battery life. It also features a built-in FIFO and motion-activated switch function that can reduce power consumption throughout the system. It also has a wide range of built-in hardware functions, such as a step counter and temperature sensor, which contribute to simplifying design. It also offers a wide range of features that enable flexible design, such as an interface that supports both SPI and I2C. These features offer significant benefits at the system level.
ADXL366
3-axis,±2g/±4g/±8gdigital outputMEMSaccelerometer
Power supply voltage range
-1.1V to 3.6V, 1-cell battery operation possible
-High PSRR internal power regulation
- Ultra-low power consumption
-0.96µA (100Hz ODR, 50Hz BW, at 2.0V supply)
- Wake-up mode current consumption 191nA
-Standby mode current consumption 47nA
・High resolution: 0.25mg/LSB
- Built-in functions for system-level power saving
-Step counter
-Single tap/double tap detection
- Motion detection with configurable thresholds
-Autonomous interrupt function
- 512 built-in FIFO to minimize processor load
-Wake status output to enable motion-activated switches
- Built-in temperature sensor
・SPI and I2C digital interfaces
2.2mm x 2.3mm x 0.87mm, 12-pin LGA package
The features of the ADXL366 are explained below from three perspectives.
Ultra-low power consumption design that definitely contributes to extended battery life
When selecting an accelerometer for a wearable device, the first thing you want to check is the power consumption specifications. The current consumption of the ADXL366 has been kept to an extremely low level, as shown below. This is top-class performance compared to accelerometers from other companies.
- Measurement mode: 0.96μA (100Hz ODR)
- Wake-up mode: 191nA
- Standby mode: 47nA
By using the ultra-low power ADXL366, the frequency of battery replacement can be dramatically reduced, even in wearable devices and IoT devices that operate 24 hours a day.
The industry's only acceleration sensor that can be driven from a 1.1V power supply
The ADXL366 can operate from a power supply voltage of 1.1V, which is an extremely rare specification for an accelerometer and is the only product on the market with this specification as of January 2026.
Most acceleration sensors generally have a power supply voltage of 1.6 V or higher, and Analog Devices' best-selling product, the ADXL362 (released in 2012), also had a minimum power supply voltage of 1.6 V. This made it difficult to power it with, for example, a 1.5 V single-cell battery, but the ADXL366 makes this possible.
|
ADXL366 |
ADXL362/ADXL363 |
|
|
Package size |
2.2×2.3×0.87 mm |
3.2×3.0×1.06 mm |
|
resolution |
14-bit |
12-bit |
|
Measurement Range |
±2g, ±4g, ±8g |
±2g, ±4g, ±8g |
|
Current consumption (100Hz) |
0.96µA |
1.8µA |
|
Wake-up current |
191nA |
270nA |
|
Standby Current |
47nA |
10nA |
|
Power supply voltage range |
1.1V～3.6V |
1.6V～3.5V |
|
temperature range |
-40～+85℃ |
-40～+85℃ |
|
Noise Density (Ultra Low Power Mode) |
345µg/√Hz |
550µg/√Hz |
|
interface |
SPI, I²C, ADC input |
SPI, ADC input (ADXL363) |
|
FIFO |
512 words |
512 words |
|
Built-in features |
Temperature sensor, tap, self-test, pedometer |
Temperature sensor, self-test |
The ADXL366 operates from as little as 1.1V and the sensor itself consumes very little power, enabling unprecedented battery life extension.
For example, based on the theoretical power consumption of the sensor itself, even a small single-cell battery can be expected to operate for a long period of time, from several years to several hundred years. The following are all theoretical values when operating in ultra-low power consumption mode.
As you can see, even a single small button battery, such as those used in hearing aids, can provide several years of operation, and can maintain operation for a longer period of time even when the voltage drops as the battery level decreases.
A power supply voltage of 1.1V or higher is a major advantage for wearable devices. While we tend to focus only on the power consumption of sensors, the power supply voltage range is also an important factor.
Contributes to power savings across the entire system
Battery life depends on the power consumption of the entire system, not just the sensor. The ADXL366 contributes to overall system power savings with the following features:
Built-in FIFO function (512 samples)
Up to 512 samples of acceleration data can be stored in the built-in FIFO while the microcontroller is in sleep mode. Intermittent data output significantly reduces the number of communications, thereby reducing the microcontroller's power consumption.
Motion-activated switch function
The ADXL366 features a motion-activated switch function that uses motion detection as a trigger to wake up the system only when needed.The ADXL366 's extremely low standby current of 47nA minimizes power consumption.
This functionality also allows the ADXL366 to be used as a motion-activated switch to turn other devices on and off.
Ultra-small package measuring just 2.3mm square, allowing for free design
The next thing to look at is package size. The smaller the accelerometer, the more compact the wearable device itself can be, and the greater the freedom in board design.
The ADXL366 is housed in an ultra-small, thin package measuring just 2.2mm x 2.3mm x 0.87mm, making it ideal for applications such as hearing aids and smartwatches where comfort is essential.
Size comparison with the conventional product "ADXL362"
To give you an idea of the size, the following image shows two accelerometers placed on a US one-cent coin.
Left: ADXL362 (conventional product)
Right: ADXL366 *The photo shows a different product with the same package size.
Compared to the ADXL362, the ADXL366 is approximately 47 % smaller in area and 20 % smaller in height. This significantly reduces the amount of space required, reducing board design constraints and enabling smaller, lighter wearable devices.
In recent years, the wearable device market has seen growing demand for comfort and design. Miniaturizing accelerometers increases design freedom for wearable devices, directly leading to improved product competitiveness.
I2C compatibility reduces wiring
The ADXL366 supports both SPI and I2C interfaces. While the previous model, the ADXL362, only supported a 4-wire SPI interface, the ADXL366 also supports a 2-wire I2C interface.
By selecting the I2C interface, you can reduce the amount of wiring required to connect to the microcontroller. In addition to reducing the package size, the reduction in the number of wires allows for further space savings on the board. This is another major advantage for wearable devices, where mounting area is limited.
Benefits of replacing conventional products
The previous model, the ADXL362, attracted attention from the moment it was released for its revolutionary low power consumption, and has been used by many users for many years. The ADXL366 inherits the same excellent features while achieving even smaller size and lower power consumption. If you are currently using the ADXL362, we recommend replacing it with the ADXL366.
Although you will need to redesign your board due to the different size and pin layout, you can enjoy significant benefits such as extended battery life and reduced board space. Please consider this as an option to increase the added value of your product.
Multifunctionality possible without the need for additional parts
To realize small, energy-efficient wearable devices, it is important to implement various functions with a simple configuration. Adding a function increases the number of components and software processing, which complicates the design and leads to increased power consumption and size.
The ADXL366 has a wide range of built-in hardware functions that can be used to add functionality to wearable devices without the need for additional components or software processing.
The ADXL366 is ADI 's first accelerometer to incorporate a step counter. This allows the pedometer function to be implemented without having to write software to calculate the number of steps into the microcontroller. This reduces the computational load on the microcontroller, leading to power savings for the entire system.
The ADXL362 also includes tap detection and a temperature sensor, as with the previous model ADXL362. Utilizing the temperature sensor allows data to be corrected according to temperature characteristics, enabling more stable measurements. It also supports external analog input. By switching the internal switch, analog values acquired by an external sensor can be A/D converted and output to a downstream microcontroller. For example, this can be used to monitor power supply voltage and detect voltage drops.
By implementing various functions on the hardware side, it is possible to simplify the design, reduce the number of components and development time, and achieve power savings for the entire system.
Application example
The ADXL366 is ideal for applications requiring low power consumption and high accuracy motion sensing. A typical example is a battery-powered application that detects human movement. Taking advantage of its low power consumption characteristics, it can also be used for motion detection switches.
・Wearable devices
Used for pedometers and motion detection in smartwatches, fitness trackers, healthcare devices, etc.
・Medical equipment
Suitable for applications requiring low power consumption and high accuracy, such as patient monitoring and rehabilitation support equipment
・Sports and fitness equipment
User interaction using step counter and tap detection functions
IoT sensors
Contributes to longer battery life in environmental monitoring, smart home devices, industrial sensors, etc.
- Motion activated switch
Contributes to energy savings through motion detection power control, smart metering, wireless sensor systems, etc.
Evaluation Board
We have an ADXL366 evaluation board available. You can easily check the ADXL366 's functions and smoothly evaluate and develop. Please give it a try.
This time, we introduced ADI 's acceleration sensor "ADXL366", which was created for wearable devices.
Please feel free to contact us.
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