STM32L021D4P7TR

Ultra-low-power ARM Cortex-M0+ MCU with 16-Kbytes Flash, 32MHz CPU, AES

Reset and supply management

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.

**Key Features**

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Ultra-low-power platform

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1.65 V to 3.6 V power supply

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-40 to 125 °C temperature range

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0.23 μA Standby mode 2 wakeup pins

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0.29 μA Stop mode 16 wakeup lines

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0.54 μA Stop mode + RTC + 2 KB RAM retention

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Down to 76 μA/MHz in Run mode

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5 μs wakeup time from Flash memory

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41 μA 12-bit ADC conversion at 10 ksps

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Core: Arm® 32-bit Cortex®-M0+

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From 32 kHz to 32 MHz max.

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0.95 DMIPS/MHz

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Ultra-safe, low-power BOR brownout reset with 5 selectable thresholds

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Ultralow power POR/PDR

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Programmable voltage detector PVD

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Clock sources

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0 to 32 MHz external clock

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32 kHz oscillator for RTC with calibration

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High speed internal 16 MHz factory-trimmed RC +/- 1%

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Internal low-power 37 kHz RC

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Internal multispeed low-power 65 kHz to 4.2 MHz RC

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PLL for CPU clock

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Pre-programmed bootloader

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USART, SPI supported

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Development support

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Serial wire debug supported

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Up to 28 fast I/Os 23 I/Os 5V tolerant

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Memories

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16 KB Flash memory with ECC

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2 KB RAM

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512 B of data EEPROM with ECC

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20-byte backup register

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Sector protection against R/W operation

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Rich Analog peripherals

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12-bit ADC 1.14 Msps up to 10 channels down to 1.65 V

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2x ultra-low-power comparators window mode and wake up capability, down to 1.65 V

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5-channel DMA controller, supporting ADC, SPI, I2C, USART, Timers, AES

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4x peripherals communication interface

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1x USART ISO 7816, IrDA, 1x UART low power

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1x SPI 16 Mbits/s

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1x I2C SMBus/PMBus

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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

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CRC calculation unit, 96-bit unique ID

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Hardware Encryption Engine AES 128-bit

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All packages are ECOPACK®2