IoT-friendly MCU draws as little as 20nA in shutdown mode
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.
The STM32L4+ series includes 640Kbytes of SRAM to assist high-speed computation and help maximize graphics performance. In addition, the devices in this series provide up to 2Mbytes of dual-bank Flash memory, giving extensive code and data storage with efficient read-while-write capability. The Flash also has extensive error-correction features, suitable for use in safety-conscious applications.
ST’s unique Chrom-ART Accelerator (DMA2D) offloads repetitive 2D-graphics calculations from the main CPU. It can perform 2D copies, transparency and alpha-blending operations, as well as pixel format conversions, two times faster than the main CPU. The saved CPU cycles can be re-allocated for real-time processing, running concurrently with the graphic operations, or to handle even more impressive graphic effects.
Rich digital and analog features include extensive USB support with Host, Device, and OTG capabilities, 17 timers for functions such as motor control, digital communication interfaces including SPI, SAI, CAN, and high-speed digital filters for signal processing.
The analog peripherals include high-speed analog-digital converters (ADCs), digital-analog converters (DACs), and precision voltage references, comparators, and op-amps. All are architected to maximize energy efficiency in any operating mode, such as by powering down converters in between capturing samples. The STM32L4+ series is can be specified up to 125°C.
STMicroelectronics – www.st.com
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