STM32L072KBU6

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1. Description

The ultra-low-power STM32L072KBU6 microcontrollers incorporate the connectivity power of the universal serial bus (USB 2.0 crystal-less) with the high-performance Arm Cortex-M0+ 32-bit RISC core operating at a 32 MHz frequency, a memory protection unit (MPU), highspeed embedded memories (up to 192 Kbytes of Flash program memory, 6 Kbytes of data EEPROM and 20 Kbytes of RAM) plus an extensive range of enhanced I/Os and peripherals. The STM32L072xx 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 STM32L072xx devices offer several analog features, one 12-bit ADC with hardware oversampling, two DACs, two ultra-low-power comparators, several timers, one low-power timer (LPTIM), four general-purpose 16-bit timers and two basic timer, 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 STM32L072xx devices embed standard and advanced communication interfaces: up to three I2Cs, two SPIs, one I2S, four USARTs, a low-power UART (LPUART), and a crystal-less USB. The devices offer up to 24 capacitive sensing channels to simply add touch sensing functionality to any application. The STM32L072xx also include a real-time clock and a set of backup registers that remain powered in Standby mode. The ultra-low-power STM32L072xx 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.

2. Features

    1. 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

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

        – From 32 kHz up to 32 MHz max.

        – 0.95 DMIPS/MHz

    3. 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

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

    5. Reset and supply management

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

        – Ultra-low-power POR/PDR

        – Programmable voltage detector (PVD)

    6. 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

        – Internal self calibration of 48 MHz RC for USB

        – PLL for CPU clock

    7. Pre-programmed bootloader

        – USB, USART supported

    8. Development support

        – Serial wire debug supported

    9. Rich Analog peripherals

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

        – 2 x 12-bit channel DACs with output buffers (down to 1.8 V)

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

  10. Up to 24 capacitive sensing channels supporting touchkey, linear and rotary touch sensors

  11. 7-channel DMA controller, supporting ADC, SPI, I2C, USART, DAC, Timers

  12. 11x peripheral communication interfaces

        – 1x USB 2.0 crystal-less, battery charging detection and LPM

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

        – Up to 6x SPI 16 Mbits/s

        – 3x I2C (2 with SMBus/PMBus)

  13. 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 for DAC, and 2x watchdogs (independent/window)

  15. CRC calculation unit, 96-bit unique ID

  16. True RNG and firewall protection

  17. All packages are ECOPACK2

3. Applications

    1. Gas/water meters and industrial sensors

    2. Healthcare and fitness equipment

    3. Remote control and user interface

    4. PC peripherals, gaming, GPS equipment

    5. Alarm system, wired and wireless sensors, video intercom

4. The digital interface supports the following functions

    1. One data holding register (per channel)

    2. Left or right data alignment in 12-bit mode

    3. Synchronous update capability

    4. Noise wave generation

    5. Triangle wave generation

    6. Dual DAC channels with independent or simultaneous conversion

    7. DMA functionality (including underrun interrupts)

    8. External trigger for conversion

    9. Input reference voltage VREF+

5. The MCU is placed under the following conditions

    1. All I/O pins are configured in analog input mode

    2. All peripherals are disabled except when explicitly mentioned

    3. The Flash memory access time and prefetch is adjusted depending on fHCLK frequency and voltage range to provide the best CPU performance unless otherwise specified.

    4. When the peripherals are enabled fAPB1 = fAPB2 = fAPB

    5. When PLL is ON, the PLL inputs are equal to HSI = 16 MHz (if internal clock is used) or HSE = 16 MHz (if HSE bypass mode is used)

    6. The HSE user clock applied to OSCI_IN input follows the characteristic specified in

    7. For maximum current consumption VDD = VDDA = 3.6 V is applied to all supply pins

    8. For typical current consumption VDD = VDDA = 3.0 V is applied to all supply pins if not specified otherwise

6. Low-power modes

The ultra-low-power STM32L072KBU6 support dynamic voltage scaling to optimize its power consumption in Run mode. The voltage from the internal low-drop regulator that supplies the logic can be adjusted according to the system’s maximum operating frequency and the external voltage supply. 

7. Pin configuration

8. Functional overview

    1. 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.

    2. Low-power run mode

        This mode is achieved with the multispeed internal (MSI) RC oscillator set to the lowspeed clock (max 131 kHz), execution from SRAM or Flash memory, and internal regulator in low-power mode to minimize the regulator's operating current. In Lowpower run mode, the clock frequency and the number of enabled peripherals are both limited.

    3. Low-power sleep mode

        This mode is achieved by entering Sleep mode with the internal voltage regulator in low-power mode to minimize the regulator’s operating current. In Low-power sleep mode, both the clock frequency and the number of enabled peripherals are limited; a typical example would be to have a timer running at 32 kHz. When wakeup is triggered by an event or an interrupt, the system reverts to the Run mode with the regulator on.

    4. Stop mode without RTC

        The Stop mode achieves the lowest power consumption while retaining the RAM and register contents. All clocks are stopped, the PLL, MSI RC, HSI and LSI RC, HSE and LSE crystal oscillators are disabled. Some peripherals featuring wakeup capability can enable the HSI RC during Stop mode to detect their wakeup condition. The voltage regulator is in the low-power mode. The device can be woken up from Stop mode by any of the EXTI line, in 3.5 µs, the processor can serve the interrupt or resume the code. The EXTI line source can be any GPIO. It can be the PVD output, the comparator 1 event or comparator 2 event (if internal reference voltage is on). It can also be wakened by the USB/USART/I2C/LPUART/LPTIMER wakeup events.

    5. Standby mode with RTC

        The Standby mode is used to achieve the lowest power consumption and real time clock. The internal voltage regulator is switched off so that the entire VCORE domain is powered off. The PLL, MSI RC, HSE crystal and HSI RC oscillators are also switched off. The LSE or LSI is still running. After entering Standby mode, the RAM and register contents are lost except for registers in the Standby circuitry (wakeup logic, IWDG, RTC, LSI, LSE Crystal 32 KHz oscillator, RCC_CSR register). The device exits Standby mode in 60 µs when an external reset (NRST pin), an IWDG reset, a rising edge on one of the three WKUP pins, RTC alarm (Alarm A or Alarm B), RTC tamper event, RTC timestamp event or RTC Wakeup event occurs.

    6. Standby mode without RTC

        The Standby mode is used to achieve the lowest power consumption. The internal voltage regulator is switched off so that the entire VCORE domain is powered off. The PLL, MSI RC, HSI and LSI RC, HSE and LSE crystal oscillators are also switched off. After entering Standby mode, the RAM and register contents are lost except for registers in the Standby circuitry (wakeup logic, IWDG, RTC, LSI, LSE Crystal 32 KHz oscillator, RCC_CSR register).