Ultra-low power MCU smashes through EEMBC ULPBench ceiling

This approach normalises the many different behaviors of MCU operation such as active current, sleep current, wake-up time, core efficiency, and cache efficiency. It then synthesises this data into a single value developers truly care about – the amount of energy required to complete their specific application.

“We are tremendously excited to achieve this record benchmark result as it illustrates the clear energy saving benefits of the Ambiq Micro subthreshold design approach,” says Keith Odland, Senior Director of Marketing, Ambiq Micro, “this is great news for developers of battery-powered wearables and other energy-sensitive IoT devices. It’s the kind of leap in performance that’s going to make the creation of completely new consumer products possible by more than doubling battery life or enabling more features to be added without increasing the power budget.”

”To state that the Apollo MCU’s ULPBench results are impressive is truly an understatement, providing a practical, real-world demonstration of the device’s nearly ideal voltage transfer characteristics of its logic gates and reduced gate input capacitance,” said Markus Levy, President, EEMBC. “After completing certification by the EEMBC Technology Center, we have confirmed that the Apollo MCU scores were achieved in compliance with the ULPBench standard requirements.”

The Apollo MCU is based on a high-performance, 32-bit ARM Cortex-M4 processor with floating point unit. It runs at up to 24MHz and integrates ultra-low power memory, up to 512kB Flash and 64kB RAM. The MCU comes with a rich set of timing peripherals, I²C/SPI master and slave ports and a UART for communicating with peripherals and legacy devices.

Ambiq’s patented Subthreshold Power Optimised Technology (SPOT) platform enables the Apollo MCU to achieve its best-in-class power consumption in both active-mode and sleep-mode. That’s unique and the MCU consumes a meagre 34µA/MHz executing instructions from Flash and sleep-mode currents can be as low as 140nA.

Ambiq recently announced that the Apollo MCU is at the heart of the Misfit Shine2 wearable fitness and sleep monitor, and that energy consumption was a key criterion for its selection by Misfit designer engineers.