STM32L071K8U3 Description

The high-performance Arm Cortex-M0+ 32-bit RISC core, a memory protection unit (MPU), high-speed embedded memories (up to 192 Kbytes of Flash program memory, 6 Kbytes of data EEPROM, and 20 Kbytes of RAM), as well as a wide variety of enhanced I/Os and peripherals, are all included in the access line ultra-low-power STM32L071K8U3 microcontroller.

High power efficiency is offered by the STM32L071K8U3 device for a variety of performances. A wide variety of internal and external clock sources, an internal voltage adaption, and numerous low-power modes are used to achieve it.

The STM32L071K8U3 device includes a number of analog features, including a 12-bit ADC with hardware oversampling, two ultra-low-power comparators, several timers, one low-power timer (LPTIM), four general-purpose 16-bit timers, and two basic timers, one RTC and one SysTick that can be used as timebases. They also have two watchdogs: a window watchdog based on a bus clock and a watchdog with separate clock and window functionality.

The STM32L071xx devices also incorporate both conventional and cutting-edge communication interfaces, including up to three I2Cs, two SPIs, one I2S, four USARTs, and a low-power UART (LPUART).

A real-time clock and a collection of backup registers are also included in the STM32L071K8U3.

The ultra-low-power STM32L071xx devices run on a 1.8 to 3.6 V power supply with BOR and a 1.65 to 3.6 V power supply without BOR option (down to 1.65 V at power down). They are offered in the temperature range of -40 to +125 °C. The development of low-power applications is made possible by a wide range of power-saving modes.

STM32L071K8U3 Features

• Rich Analog peripherals

– 12-bit ADC 1.14 Msps up to 16 channels (down to 1.65 V)

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

• 7-channel DMA controller, supporting ADC, SPI, I2C, USART, Timers

• Up to 10x peripheral communication interfaces

– 4x USART (2 with ISO 7816, IrDA), 1x UART (low power)

– Up to 6x SPI 16 Mbits/s

– 3x I2C (2 with SMBus/PMBus)

• 11x timers: 2x 16-bit with up to 4 channels, 2x 16-bit with up to 2 channels, 1x 16-bit ultra-low-power timer, 1x SysTick, 1x RTC, 2x 16-bit basic, and 2x watchdogs (independent/window)

• CRC calculation unit, 96-bit unique ID

• All packages are ECOPACK2

• Ultra-low-power platform

– 1.65 V to 3.6 V power supply

– -40 to 125 °C temperature range

– 0.29 μA Standby mode (3 wakeup pins)

– 0.43 μA Stop mode (16 wakeup lines)

– 0.86 μA Stop mode + RTC + 20-Kbyte RAM retention

– Down to 93 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+ with MPU

– From 32 kHz up to 32 MHz max.

– 0.95 DMIPS/MHz

• Memories

– Up to 192-Kbyte Flash memory with ECC(2 banks with read-while-write capability)

– 20 -Kbyte RAM

– 6 Kbytes of data EEPROM with ECC

– 20-byte backup register

– Sector protection against R/W operation

• Up to 84 fast I/Os (78 I/Os 5V tolerant)

• Reset and supply management

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

– Ultra-low-power POR/PDR

– Programmable voltage detector (PVD)

• Clock sources

– 1 to 25 MHz crystal oscillator

– 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, I2C, SPI supported

• Development support

– Serial wire debug supported

STM32L071K8U3 Applications

• Remote control and user interface

• PC peripherals, gaming, GPS equipment

• Alarm system, wired and wireless sensors, video intercom

• Gas/water meters and industrial sensors

• Healthcare and fitness equipment