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AN4445 Datasheet(PDF) 5 Page - STMicroelectronics |
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AN4445 Datasheet(HTML) 5 Page - STMicroelectronics |
5 / 17 page DocID025944 Rev 1 5/17 AN4445 STM32L0xx main features 16 1 STM32L0xx main features Based on the solid foundations of the award-winning STM32F0x and STM32L1 families, the STM32L0xx embeds various innovations which minimize the consumption in different configurations, while maintaining most of the existing peripherals and a quasi pin-to-pin compatibility. For a given manufacturing process and die area, the consumption of a microcontroller largely depends on two factors which can be controlled dynamically: voltage and frequency. In the STM32L0xx devices, an internal low drop regulator supplies most of the logic circuitry with a fixed voltage: this guarantees that consumption is kept minimal whatever the supply voltage, along the lifetime of portable battery-supplied products, down to 1.65 V. If we consider the clock sources, several cascaded clock prescalers, gating techniques and peripheral-by-peripheral clock management allow only the necessary logic gates to be activated, and at the adequate frequency. These are now design practices commonly used for reducing the consumption in Run mode. For the STM32L0xx, additional efforts have been done in this direction with the implementation of voltage scaling to reach an even higher processing efficiency. However, all ultra-low power requirements cannot be met by simply focusing on run time: for most applications, the challenge is to spend the minimum time and energy in this mode and find the adequate low power mode. The improvements do not come only from the deep sleep modes optimized to eliminate every ten nA of leakage. The system has also been complemented with seven low power modes and a set of peripherals tuned for low power (such as the calendar real-time clock and glass LCD controller). These items are described in more detail hereafter. |
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