Designers of Internet of Things (IoT) edge nodes can minimise power consumption for tasks like floating point operations and advanced algorithms leveraging a new ARM Cortex-M4 microcontroller (MCU) from Analog Devices. Using a ‘sensorstrobe’ technique, the ADuCM4050 MCU can remain in a low power state while data collection is taking place. This allows it to deliver over 10 times system-level power savings that result in extended battery life or longer time between battery charges.
The MCU claims an active-mode consumption of 40μA/MHz, which drops to 680nA in hibernate mode.
According to the firm, the ADuCM4050 MCU targets applications where long battery life is critical, but where security, performance integrity, and the ability to pre-process and filter sensor data to eliminate artifacts and noise are also requirements. Applications include clinical vital-signs monitoring, smart energy management, and asset health/factory equipment reporting.
The new MCU includes an ARM Cortex-M4 core with floating-point unit, expanded SRAM, and embedded flash memory in order to allow localized decision making and ensuring that only the most important data is sent to the cloud.
The boost in security is attributed to on-chip encryption including AES 128/256, SHA 256, block ciphers for code protection, key wrap, and HMAC.
The device supports multiple digital- and analog-sensor inputs which can be combined to analyse their data for smarter, more sophisticated functionality. Therefore, there is no need to wake up the microcontroller frequently to report routine or partial data, thus saving significant power over the long term, according to the firm.
“The MCU claims an active-mode consumption of 40μA/MHz, which drops to 680nA in hibernate mode.” It features a large amount of SRAM and flash memory which are 128kB and 512kB, respectively. In addition, the MCU can save further power as it retains almost all of the data in SRAM, which enables it to get data ready quicker when it wakes up from hibernate (sleep) mode.
To support the MCU, the firm has also unveiled an ultralow-power low-g ADXL362 and ADXL372 high-g MEMS accelerometer. SensorStrobe technology offered in the new MCU, is also featured in these sensors for system-level power savings.
The MCU has entered production and available at a price of $4.29. For further details, view the full Press release.