STM32L051的低功耗初探

起因：有个项目需要做低功耗，以前都是用的MSP430。现在想换一个方案。

发现STM32L 系列的数据比较亮眼，与我实测的数据基本一致。

Ultra-low-power platform

– 1.65 V to 3.6 V power supply

– -40 to 125 °C temperature range

– 0.27 μA Standby mode (2 wakeup pins)

– 0.4 μA Stop mode (16 wakeup lines)

– 0.8 μA Stop mode + RTC + 8-Kbyte RAM retention

– 88 μA/MHz in Run mode

– 3.5 μs wakeup time (from RAM)

– 5 μs wakeup time (from Flash memory)

• Core: Arm® 32-bit Cortex®-M0+ with MPU

– From 32 kHz up to 32 MHz max.

– 0.95 DMIPS/MHz

There are three power consumption ranges:

• Range 1 (VDD range limited to 1.71-3.6 V), with the CPU running at up to 32 MHz

• Range 2 (full VDD range), with a maximum CPU frequency of 16 MHz

• Range 3 (full VDD range), with a maximum CPU frequency limited to 4.2 MHz

Seven low-power modes are provided to achieve the best compromise between low-power

consumption, short startup time and available wakeup sources:

• Sleep mode

In Sleep mode, only the CPU is stopped. All peripherals continue to operate and can

wake up the CPU when an interrupt/event occurs. Sleep mode power consumption at

16 MHz is about 1 mA with all peripherals off.

• Low-power run mode

This mode is achieved with the multispeed intern