Overview
The STM32L451CEU6 is an ultra-low-power microcontroller from STMicroelectronics, based on the high-performance Arm® Cortex®-M4 32-bit RISC core. This device operates at a frequency of up to 80 MHz and features a Floating Point Unit (FPU) that supports all Arm® single-precision data-processing instructions and data types. It also includes a full set of DSP instructions and a Memory Protection Unit (MPU) to enhance application security.
The microcontroller is designed for low-power applications, with a comprehensive set of power-saving modes. It supports a wide temperature range of -40 to +85 °C (and up to +125 °C junction temperature) and operates from a 1.71 to 3.6 V power supply.
Key Specifications
| Parameter | Value |
|---|---|
| Core | Arm® 32-bit Cortex®-M4 CPU with FPU |
| Maximum Clock Frequency | 80 MHz |
| Program Memory Size | Up to 512 KB Flash |
| Data Bus Width | 32 bit |
| SRAM | 160 KB (including 32 KB with hardware parity check) |
| ADC Resolution | 12-bit, up to 16-bit with hardware oversampling |
| DAC Channels | 1x 12-bit DAC output channel |
| Operational Amplifier | 1x operational amplifier with built-in PGA |
| Comparators | 2x ultra-low-power comparators |
| Timers | 1x 32-bit, 5x 16-bit general purpose, 2x 16-bit low-power timers |
| Communication Interfaces | 4x I2C, 3x SPI, 3x USART, 1x UART, 1x Low-Power UART, 1x SAI, 1x SDMMC, 1x CAN |
| Capacitive Sensing Channels | Up to 21 channels |
| Power Supply | 1.71 to 3.6 V |
| Operating Temperature | -40 to +85 °C (and up to +125 °C junction temperature) |
| Package | UFQFPN 48 7x7x0.55 mm |
Key Features
- Ultra-low-power with FlexPowerControl
- Arm® 32-bit Cortex®-M4 CPU with FPU, Adaptive real-time accelerator (ART Accelerator™), and DSP instructions
- High-speed memories: up to 512 KB Flash, 160 KB SRAM
- Quad SPI Flash memories interface
- Extensive range of enhanced I/Os and peripherals connected to two APB buses, two AHB buses, and a 32-bit multi-AHB bus matrix
- Protection mechanisms: readout protection, write protection, proprietary code readout protection, and Firewall
- Fast 12-bit ADC (5 Msps), 1x 12-bit DAC output channel, 1x operational amplifier, 2x ultra-low-power comparators
- Low-power RTC, general-purpose timers, and low-power timers available in Stop mode
- Up to 21 capacitive sensing channels supporting touchkey, linear, and rotary touch sensors
- Standard and advanced communication interfaces: I2C, SPI, USART, UART, Low-Power UART, SAI, SDMMC, CAN
- Independent power supplies for analog components and VBAT input for RTC and backup registers
- Comprehensive set of power-saving modes: VBAT mode, Shutdown mode, Standby mode, Stop 2 mode
- Development support: serial wire debug (SWD), JTAG, Embedded Trace Macrocell™
- All packages are ECOPACK2® compliant
Applications
The STM32L451CEU6 is suitable for a wide range of applications that require ultra-low power consumption and high performance. These include:
- IoT devices and smart home applications
- Industrial automation and control systems
- Medical devices and healthcare equipment
- Consumer electronics and wearable devices
- Automotive systems, especially those requiring low power and high reliability
- Sensor networks and data acquisition systems
Q & A
- What is the core architecture of the STM32L451CEU6?
The STM32L451CEU6 is based on the Arm® 32-bit Cortex®-M4 CPU with a Floating Point Unit (FPU).
- What is the maximum clock frequency of the STM32L451CEU6?
The maximum clock frequency is up to 80 MHz.
- What are the memory specifications of the STM32L451CEU6?
The device has up to 512 KB of Flash memory and 160 KB of SRAM.
- What are the power supply and operating temperature ranges of the STM32L451CEU6?
The power supply range is 1.71 to 3.6 V, and the operating temperature range is -40 to +85 °C (and up to +125 °C junction temperature).
- What types of communication interfaces does the STM32L451CEU6 support?
The device supports I2C, SPI, USART, UART, Low-Power UART, SAI, SDMMC, and CAN interfaces.
- Does the STM32L451CEU6 have any power-saving modes?
Yes, it has several power-saving modes including VBAT mode, Shutdown mode, Standby mode, and Stop 2 mode.
- What kind of analog peripherals are available on the STM32L451CEU6?
The device features a 12-bit ADC, a 12-bit DAC, an operational amplifier, and two ultra-low-power comparators.
- How many capacitive sensing channels does the STM32L451CEU6 support?
It supports up to 21 capacitive sensing channels.
- Is the STM32L451CEU6 RoHS compliant?
Yes, the STM32L451CEU6 is ECOPACK2® compliant.
- What development tools are available for the STM32L451CEU6?
Development support includes serial wire debug (SWD), JTAG, and Embedded Trace Macrocell™.
