Overview
The STM32L422CBU6 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 with high-speed memories, including up to 128 KB of flash memory and 40 KB of SRAM. It also features a Quad SPI flash memory interface, extensive I/Os, and peripherals connected to multiple buses. The device includes several protection mechanisms for embedded flash memory and SRAM, such as readout protection, write protection, and proprietary code readout protection.
The STM32L422CBU6 is optimized for low-power applications, offering various power-saving modes and a wide temperature range of -40 °C to 85/125 °C. It supports independent power supplies for analog components and includes a VBAT input for backing up the RTC and backup registers.
Key Specifications
| Specification | Details |
|---|---|
| Core | Arm® 32-bit Cortex®-M4 CPU with FPU, up to 80 MHz |
| Memories | 128 KB single bank flash, 40 KB SRAM (including 8 KB with hardware parity check) |
| Power Supply | 1.71 V to 3.6 V |
| Temperature Range | -40 °C to 85/125 °C |
| ADC | 2x 12-bit ADC, 5 Msps, up to 16-bit with hardware oversampling |
| Timers | 1x 32-bit, 4x 16-bit general purpose, 1x 16-bit advanced motor-control, 2x low-power 16-bit timers |
| Communication Interfaces | 3x I2C, 2x SPI, 3x USART, 1x Low-Power UART, 1x USB full-speed device crystal less |
| Security | AES 128/256-bit key encryption hardware accelerator |
| Package | UFQFPN 48 7x7x0.55 mm |
| Power Modes | Shutdown, Standby, Stop 2, VBAT mode |
Key Features
- Ultra-low-power with FlexPowerControl
- Adaptive real-time accelerator (ART Accelerator™) allowing 0-wait-state execution from flash memory
- Up to 52 fast I/Os, most 5 V-tolerant
- RTC with HW calendar, alarms, and calibration
- Up to 12 capacitive sensing channels: support touchkey, linear, and rotary touch sensors
- Rich analog peripherals (independent supply): 2x 12-bit ADC, 1x operational amplifier, 1x ultra-low-power comparator
- AES 128/256-bit key encryption hardware accelerator
- Batch acquisition mode (BAM), 4 µs wakeup from Stop mode, Brown out reset (BOR)
- Internal multispeed 100 kHz to 48 MHz oscillator, auto-trimmed by LSE
- True random number generator, CRC calculation unit, 96-bit unique ID
Applications
The STM32L422CBU6 is suitable for a wide range of applications requiring low power consumption and high performance. These include:
- IoT devices and smart sensors
- Industrial automation and control systems
- Medical devices and healthcare equipment
- Consumer electronics and wearables
- Automotive systems and telematics
- Energy metering and smart grid applications
Q & A
- What is the core architecture of the STM32L422CBU6?
The STM32L422CBU6 is based on the Arm® 32-bit Cortex®-M4 CPU with a Floating Point Unit (FPU), operating at up to 80 MHz.
- What are the memory specifications of the STM32L422CBU6?
The device features 128 KB of single bank flash memory and 40 KB of SRAM, including 8 KB with hardware parity check.
- What is the power supply range for the STM32L422CBU6?
The power supply range is from 1.71 V to 3.6 V.
- What are the key analog peripherals of the STM32L422CBU6?
The device includes 2x 12-bit ADCs, an operational amplifier, and an ultra-low-power comparator.
- What communication interfaces are available on the STM32L422CBU6?
The device features 3x I2C, 2x SPI, 3x USART, 1x Low-Power UART, and 1x USB full-speed device crystal less.
- What security features does the STM32L422CBU6 offer?
The device includes an AES 128/256-bit key encryption hardware accelerator.
- What are the power-saving modes available on the STM32L422CBU6?
The device offers Shutdown, Standby, Stop 2, and VBAT modes.
- What is the temperature range for the STM32L422CBU6?
The operating temperature range is from -40 °C to 85/125 °C.
- What is the package type for the STM32L422CBU6?
The device is available in a UFQFPN 48 7x7x0.55 mm package.
- Does the STM32L422CBU6 support capacitive sensing?
Yes, it supports up to 12 capacitive sensing channels for touchkey, linear, and rotary touch sensors.
- What development tools are available for the STM32L422CBU6?
The device supports serial wire debug (SWD), JTAG, and Embedded Trace Macrocell™ for development.
