STM32L452REI3

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The STM32L452REI3 is an embedded microcontroller from STMicroelectronics and part of the STM32L4+ series. It offers an optimized mix of advanced technologies including an Arm Cortex-M4 core, a rich set of integrated peripherals and highly accurate real-time clocks. The microcontroller is ideal for applications such as consumer devices, smart home appliances, medical systems, consumer electronics, security and IoT applications.

Application Field

The STM32L452REI3, a 32-bit microcontroller with Arm Cortex-M4, is suitable for various consumer applications, such as Bluetooth low energy (BLE) and other consumer applications. The microcontroller can be used for cost-effective consumer applications such as consumer appliances, consumer electronics, monitors and controls, and energy metering. Its large memory size and ultra low power consumption makes it ideal for low-power IoT applications. Also, because it has built-in power management, the STM32L452REI3 can run for an extended time without requiring any external components.

Additionally, the STM32L452REI3 is perfectly suitable for automotive applications like brake, motor control, powertrain, and immobilizer systems. The available digital interface peripherals, such as I2C, SPI, and USART, are also useful for medical systems, such as ECG monitoring or heart rate monitoring of a patient.

Working Principle

The STM32L452REI3 is an embedded microcontroller which is based on the Arm Cortex-M4. It has an ARM Cortex-M4 processor core, with up to 94 MHz operating frequency, 1 MB flash memory, 256 KB RAM, and a rich set of on-chip peripherals.

The STM32L452REI3 has an internal 32 kHz watchdog timer and a real-time clock source. The watchdog timer provides an independent source of time, which helps to avoid system hang-up due to software or hardware errors. It can act as a failsafe measure, which enables the microcontroller to recover from errors. The real-time clock source provides time accuracy for a time-sensitive application, by providing a reliable, stable and independent timing source.

The embedded microcontroller also provides an extensive set of external memory interfaces. It includes two 16-bit external/SRAM buses and two 8/16-bit external bus interfaces. It also has up to 3-channel Direct Memory Access (DMA) controllers, which can be used to transfer data quickly between the microcontroller\'s internal peripherals and its external memory.

The STM32L452REI3 microcontroller permits high-speed parallel communications, with support for Inter-Integrated Circuit (I2C), Serial Peripheral Interface (SPI), and Universal Synchronous/Asynchronous Receiver/Transmitter (USART). It also offers a fully integrated analogue peripherals, such as a 10-bit analog-to-digital converter, a low-power comparator, an operational amplifier, and an onboard temperature sensor.

In addition, the STM32L452REI3 is designed for secure applications in the IoT space. It incorporates several hardware-level security features such as an independent secure real-time clock for time stamping, a secure non-volatile memory for secure storage, an external debug interface lock for preventing external debug accesses, and secure debugging with memory protection unit.

To aid development, the STM32L452REI3 includes support for development tools such as the STM32 CubeIDE, IAR-Embedded Workbench, and Keil µVision. The KEIL µVision supports the development of secure applications, and offers support for Arm Cryptocell, Trusted Firmware-M, and Low Power Platform Security Architecture.

All in all, the STM32L452REI3 microcontroller is an efficient and cost-effective 32-bit microcontroller solution, with on-chip peripherals, analog peripherals, and security features, making it suitable for use in consumer, automotive, and industrial applications.

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