STM32L053R8T6

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1. Describe

The ultra-low-power STM32L053R8T6 microcontrollers combine Universal Serial Bus (crystalless USB 2.0) connectivity with a high-performance Arm Cortex-M0+ 32-bit RISC core running at 32 MHz, providing a memory protection unit (MPU) ), high-speed embedded memory (up to 64 KB of Flash program memory, 2 KB of data EEPROM and 8 KB of RAM), and a wide range of enhanced I/O and peripherals. STM32L053x6/8 devices offer high power efficiency for a wide range of performance. It does this through multiple internal and external clock sources, internal voltage adaptation, and several low-power modes. The STM32L053x6/8 devices offer multiple analog functions, a 12-bit ADC with hardware oversampling, a DAC, two ultra-low-power comparators, several timers, a low-power timer (LPTIM), three general-purpose 16-bit timer and a base timer, an RTC and a SysTick that can be used as a time base. They also feature two watchdogs, a watchdog with independent clock and window functions and a bus-based window watchdog clock. In addition, the STM32L053x6/8 devices embed standard and high-level communication interfaces: up to two I2C, two SPI, one I2S, two USARTs, one low-power UART (LPUART) and one crystalless USB. These devices offer up to 24 capacitive sensing channels, making it easy to add touch sensing functionality to any application. The STM32L053x6/8 also includes a real-time clock and a set of spare registers that remain powered in standby mode. Finally, their integrated LCD controller has a built-in LCD voltage generator that allows driving up to 8 multiplexed LCDs with contrast independent of supply voltage. The ultra-low power STM32L053x6/8 devices operate from a 1.8 to 3.6 V supply with BOR (reduced to 1.65 V at power down) and a 1.65 to 3.6 V supply without the BOR option. They can be used in a temperature range of -40 to +125 °C. 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

        – 0.27 µA Standby mode (2 wakeup pins)

        – 0.4 µA Stop mode (16 wakeup lines)

        – 0.8 µA Stop mode + RTC + 8-Kbyte RAM retention

        – 88 µA/MHz in Run mode

        – 3.5 µs wakeup time (from RAM)

        – 5 µs wakeup time (from Flash memory)

    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 64-Kbyte Flash memory with ECC

        – 8-Kbyte RAM

        – 2 Kbytes of data EEPROM with ECC

        – 20-byte backup register

        – Sector protection against R/W operation

    4. Up to 51 fast I/Os (45 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

        – PLL for CPU clock

    7. Pre-programmed bootloader

        – USART, SPI supported

    8. Development support

        – Serial wire debug supported

    9. LCD driver for up to 8×28segments

        – Support contrast adjustment

        – Support blinking mode

        – Step-up converted on board

  10. Rich Analog peripherals

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

        – 12-bit 1 channel DAC with output buffers (down to 1.8 V)

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

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

  12. 7-channel DMA controller, supporting ADC, SPI, I2C, USART, DAC, Timers

  13. 8x peripheral communication interfaces

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

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

        – Up to 4x SPI 16 Mbits/s

        – 2x I2C (SMBus/PMBus)

  14. 9x timers: 1x 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, 1x 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. Application

    1. Gas/water meters and industrial sensors

    2. Healthcare and fitness equipment

    3. Remote control and user interface

    4. PC peripherals, games, GPS devices

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

4. Pin configuration

5. Ultra-low-power device continuum

The ultra-low-power family offers a large choice of core and features, from 8-bit proprietary core up to Arm® Cortex®-M4, including Arm® Cortex®-M3 and Arm® Cortex®-M0+. The STM32Lx series are the best choice to answer your needs in terms of ultra-low-power features. The STM32 ultra-low-power series are the best solution for applications such as gaz/water meter, keyboard/mouse or fitness and healthcare application. Several built-in features like LCD drivers, dual-bank memory, low-power run mode, operational amplifiers, 128-bit AES, DAC, crystal-less USB and many other definitely help you building a highly cost optimized application by reducing BOM cost. STMicroelectronics, as a reliable and long -term manufacturer, ensures as much as possible pin-to-pin compatibility between all STM8Lx and STM32Lx on one hand, and between all STM32Lx and STM32Fx on the other hand. Thanks to this unprecedented scalability, your legacy application can be upgraded to respond to the latest market feature and efficiency requirements.

6. 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 . 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 .