STM32L152R6T6A

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The STM32L152R6T6A is a low power microcontroller (MCU) from the STM32L family, which is part of the STM32 family of advanced and ultra energy-efficient 32-bit microcontrollers. It offers the fast performance of a Cortex-M3 core, ultra-low power consumption, advanced system peripherals and peripherals, a flexible companion chip interface, and various embedded system peripherals. As a microcontroller, it can be used in a variety of embedded systems, ranging from automotive and industrial applications to home entertainment and automation.

Overview

The STM32L152R6T6A is equipped with a Cortex-M3 32-bit processor and a Clock frequency up to 32 MHz. It is equipped with 64 Kbytes of flash memory, 4 Kbytes of SRAM and 4 Kbytes of EEPROM. It can be powered from 1.65 V to 3.6 V and has a wide range of power management features. It supports up to 16 timers, general purpose I/O and interfaces such as USART, SPI, USB, I2C, LIN, LCD, CRC and RTC.

The advanced system peripheral includes a variety of protection peripherals such as window watchdog and RTC watchdog, two independent clock domains that provide advanced clock synchronization, real time clock with built-in calendar, embedded battery backed SRAM, and clock loss detect. There are also analog peripherals for sensing, such as temperature, voltage, and up to three analog comparators.

The STM32L152R6T6A has a wide range of flexible companionchip interfaces, including I2C, UART and SPI, so users can interface easily with their specific external companionchip devices. It offers low power consumption with the P-channel MOSFET (PMOS) technology which can be used to switch on/off peripherals in order to reduce power consumption. Finally, the device includes embedded security features, such as AES encryption, secure boot and secure firmware update protocols.

Applications

The STM32L152R6T6A is an ideal choice for low power embedded systems, thanks to its ultra low power consumption. It can be used in applications such as:

• Automotive electronics, such as instrument clusters, automotive body electronics, control units, infotainment systems and embedded entertainment systems;
• Industrial automation and monitoring, such as sensor/actor networks, HVAC systems, cleanroom and safety applications, and condition monitoring systems;
• Home automation, such as lighting and home security systems;
• Consumer electronics, such as smart energy control, fitness trackers, and micro medical devices.

Working Principle

The STM32L152R6T6A microcontroller works by allowing the user to set up their own configuration of peripherals, memory and system peripherals. This is done by programming the configuration registers. By programming these registers, and by connecting the digital I/O pins of the MCU to external digital inputs, the user can control the operation of the MCU and the digital peripherals even when the MCU is in low power modes.

In the STM32L152R6T6A, an MCU Core runs a single instruction at a time and is responsible for controlling the overall operation of the device and the peripherals. The core can access different resources, such as the Memory, Flash Memory, and System Peripherals, via different buses. In addition, the MCU Core can access external devices, such as external sensors, through its digital input/output (I/O) pins.

To control its peripherals, the STM32L152R6T6A MCU Core uses a set of Peripheral Configuration Registers (PCRs) which can be used to set up their configuration. For example, the user can configure these registers to select which digital I/O pins should be used for a specific communication interface, to control the clock speed and duty cycle of a peripheral, and to configure its interrupts.

The STM32L152R6T6A also contains several power management features that allow the user to reduce its power consumption. The device contains a 3-phase voltage regulator and low power FET (PMOS) technology, which can be used to power on/off certain peripherals in order to reduce the overall power consumption. The device also has multiple wakeup sources, such as external inputs, internal alarms, and timeouts, which allow the user to configure the MCU for low power operations.

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