Описание
The access line ultra-low-power STM32L021x4 family incorporates the high-performance ARM® Cortex®-M0+ 32-bit RISC core operating at a 32 MHz frequency, high-speed embedded memories (16 Kbytes of Flash program memory, 512 bytes of data EEPROM and 2 Kbytes of RAM) plus an extensive range of enhanced I/Os and peripherals. The STM32L021x4 devices provide high power efficiency for a wide range of performance. It is achieved with a large choice of internal and external clock sources, an internal voltage adaptation and several low-power modes. The STM32L021x4 devices offer several analog features, one 12-bit ADC with hardware oversampling, two ultra-low-power comparators, AES, several timers, one low-power timer (LPTIM), three general-purpose 16-bit timers, one RTC and one SysTick which can be used as timebases. They also feature two watchdogs, one watchdog with independent clock and window capability and one window watchdog based on bus clock. Moreover, the STM32L021x4 devices embed standard and advanced communication interfaces: one I2C, one SPI, one USART, and a low-power UART (LPUART). The STM32L021x4 also include a real-time clock and a set of backup registers that remain powered in Standby mode. The ultra-low-power STM32L021x4 devices operate from a 1.8 to 3.6 V power supply (down to 1.65 V at power down) with BOR and from a 1.65 to 3.6 V power supply without BOR option. They are available in the -40 to +125 °C temperature range. A comprehensive set of power-saving modes allows the design of low-power applications.
Ultra-low-power platform 1.65 V to 3.6 V power supply -40 to 125 °C temperature range 0.23 µA Standby mode (2 wakeup pins) 0.29 µA Stop mode (16 wakeup lines) 0.54 µA Stop mode + RTC + 2 KB RAM retention Down to 76 µA/MHz in Run mode 5 µs wakeup time (from Flash memory) 41 µA 12-bit ADC conversion at 10 ksps Core: ARM® 32-bit Cortex®-M0+ From 32 kHz to 32 MHz max. 0.95 DMIPS/MHz Reset and supply management Ultra-safe, low-power BOR (brownout reset) with 5 selectable thresholds Ultralow power POR/PDR Programmable voltage detector (PVD) Clock sources 0 to 32 MHz external clock 32 kHz oscillator for RTC with calibration High speed internal 16 MHz factory-trimmed RC (+/- 1%) Internal low-power 37 kHz RC Internal multispeed low-power 65 kHz to 4.2 MHz RC PLL for CPU clock Pre-programmed bootloader USART, SPI supported Development support Serial wire debug supported Up to 28 fast I/Os (23 I/Os 5V tolerant) Memories 16 KB Flash memory with ECC 2 KB RAM 512 B of data EEPROM with ECC 20-byte backup register Sector protection against R/W operation Rich Analog peripherals 12-bit ADC 1.14 Msps up to 10 channels (down to 1.65 V) 2x ultra-low-power comparators (window mode and wake up capability, down to 1.65 V) 5-channel DMA controller, supporting ADC, SPI,I2C, USART, Timers, AES 4x peripherals communication interface 1x USART (ISO 7816, IrDA), 1x UART (low power) 1x SPI 16 Mbits/s 1x I2C (SMBus/PMBus) 7x timers: 1x 16-bit with up to 4 channels, 1x 16-bit with up to 2 channels, 1x 16-bit ultra-low-power timer, 1x SysTick, 1x RTC and 2x watchdogs (independent/window) CRC calculation unit, 96-bit unique ID Hardware Encryption Engine AES 128-bit All packages are ECOPACK®2
