Ultra-low-power STM32 (ARM) MCUs add memory up to 512 kB

March 05, 2014 // By Graham Prophet
STMicroelectronics has extended its STM32 L1 series of ultra-low-power ARM Cortex-M3 32-bit microcontrollers with new 512 kB flash devices. The L1 series now includes more than 70 part numbers in three lines that offer the combination of ultra-low power consumption and memory size up to 512 kB of Flash and 80 kB of RAM.

Offering low-power operation in ST’s own ultra-low-leakage 110-nm CMOS process and optimised architecture, the devices target cost-efficient embedded designs in connected and battery-operated applications in fitness, healthcare, wearable, and industrial/metering domains.

Key features of the L1 series include:

• ARM Cortex-M3 32-bit core: up to 33 DMIPS operating at 32 MHz;

• Pin-to-pin and software compatibility with all previous STM32 L1 devices;

• Run-mode dynamic power consumption 257 µA/MHz at 32 MHz down to 177 µA/MHz @ 4 MHz

• Two ultra-low-power modes: down to 435 nA with SRAM retention;

• True embedded EEPROM;

• Dual-bank flash allowing fast and fail-safe firmware updates and rollback, thanks to the RWW (Read-While-Write) capabilities.

These devices have voltage scaling, a flexible clock tree with low-power multi-speed internal (MSI) oscillator, and an operating temperature range of -40 to +85°C or up to 105°C in low-power modes, while ST’s 110nm process technology offers the industry’s smallest variation in power consumption between 25°C and +105°C.

The STM32 L1 512 kB is supported by an STM32 Nucleo extension board. These new prototyping boards are mbed-enabled and support Arduino connectivity while also providing ST Morpho extension headers that allow access to all of the microcontroller’s on-chip peripherals.

The STM32L151, STM32L152, and STM32L162 lines are priced from $3.95 (for 512 kB devices) (10,000).

STMicroelectronics; www.st.com