IoT-friendly MCU draws as little as 20nA in shutdown mode

November 14, 2017 // By Julien Happich
The STM32L4+ MCUs stretch performance to 150DMIPS (233 ULPMark-CP) at 120MHz and are designed to act as the central controller in a full range of fitness bands, smart watches, small medical equipment and other applications requiring instant responses and minimal downtime for battery charging.

The new Chrom-GRC graphics controller can handle circular displays (TFT-LCDs) just as efficiently as square ones, without wasting resources managing pixels that are never displayed. Also on-chip is ST’s innovative Chrom-ART Accelerator, which enhances graphics performance. 
Enhanced memory capabilities include dual Octo SPI ports, making these the first STM32 devices to support this interface. The dual ports allow cost-effective and high-speed extension of code or data storage using single/dual/quad/octal SPI, or HyperBus, Flash or SRAM memories. 
The advanced power-saving technologies, proven across all STM32L-series devices, include proprietary FlexPowerControl, which protects important data like SRAM contents and I/O-pin states when the device is in low-power modes. FlexPowerControl also provides for separate power-supply domains that allow individual voltage adjustment and power-down to meet processing loads at the lowest possible energy, and a programmable high-accuracy clock that saves external components and minimizes power consumption when operating at reduced frequency. In addition, seven main low-power modes, each with optional sub-modes, help optimize for low-power consumption, short startup time, available peripherals, and available wake-up sources. Among these modes, the shutdown mode reduces the current to just 20nA. All STM32L devices also support batch-acquisition mode, which encourages energy-efficient data capture and storage in low-power modes with the main CPU turned off. 

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