Overview
The STM32L422RBT6 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) for enhanced application security.
The microcontroller is designed for low-power applications, offering various power-saving modes such as VBAT mode, Shutdown mode, Standby mode, and Stop 2 mode. It supports a wide temperature range of -40 °C to +85 °C (or +125 °C junction) and operates from a 1.71 to 3.6 V power supply.
Key Specifications
| Parameter | Specification |
|---|---|
| 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 °C (or +125 °C junction) |
| Power Consumption | 300 nA in VBAT mode, 16 nA Shutdown mode, 32 nA Standby mode, 245 nA Standby mode with RTC, 0.7 µA Stop 2 mode, 0.95 µA with RTC |
| ADC | 2x 12-bit ADC 5 Msps, up to 16-bit with hardware oversampling |
| Timers | 1x 16-bit advanced motor-control, 1x 32-bit, 2x 16-bit general purpose, 1x 16-bit basic, 2x low-power 16-bit timers |
| Communication Interfaces | USB 2.0 full-speed, 3x I2C, 3x USART, 1x LPUART, 2x SPI, 1x Quad SPI |
| Package | LQFP 64 10x10x1.4 mm |
| Capacitive Sensing Channels | Up to 12 channels |
| AES Hardware Accelerator | 128/256-bit key encryption |
Key Features
- Ultra-low-power with FlexPowerControl
- Arm® 32-bit Cortex®-M4 CPU with FPU, Adaptive real-time accelerator (ART Accelerator™)
- High-speed memories: 128 KB flash, 40 KB SRAM
- Quad SPI flash memories interface
- Rich analog peripherals: 2x 12-bit ADC, 1x operational amplifier, 1x ultra-low-power comparator
- AES: 128/256-bit key encryption hardware accelerator
- Multiple communication interfaces: USB 2.0, I2C, USART, LPUART, SPI, Quad SPI
- Up to 52 fast I/Os, most 5 V-tolerant
- RTC with HW calendar, alarms, and calibration
- Up to 12 capacitive sensing channels
- True random number generator, CRC calculation unit, 96-bit unique ID
- Development support: serial wire debug (SWD), JTAG, Embedded Trace Macrocell™
Applications
The STM32L422RBT6 is suitable for a wide range of low-power applications, including:
- IoT devices requiring low energy consumption
- Industrial automation and control systems
- Medical devices and healthcare equipment
- Consumer electronics with touch sensing capabilities
- Automotive systems requiring robust and efficient microcontrollers
Q & A
- What is the core architecture of the STM32L422RBT6?
The STM32L422RBT6 is based on the Arm® 32-bit Cortex®-M4 CPU with a Floating Point Unit (FPU).
- What is the power supply range for the STM32L422RBT6?
The device operates from a 1.71 to 3.6 V power supply.
- What are the key power-saving modes of the STM32L422RBT6?
The device features VBAT mode, Shutdown mode, Standby mode, and Stop 2 mode.
- What types of timers are available on the STM32L422RBT6?
The device includes 1x 16-bit advanced motor-control timer, 1x 32-bit timer, 2x 16-bit general purpose timers, 1x 16-bit basic timer, and 2x low-power 16-bit timers.
- Does the STM32L422RBT6 support capacitive sensing?
Yes, it supports up to 12 capacitive sensing channels.
- What communication interfaces are available on the STM32L422RBT6?
The device includes USB 2.0 full-speed, 3x I2C, 3x USART, 1x LPUART, 2x SPI, and 1x Quad SPI.
- Is the STM32L422RBT6 suitable for high-temperature environments?
Yes, it operates in the -40 °C to +85 °C (or +125 °C junction) temperature range.
- What is the purpose of the AES hardware accelerator in the STM32L422RBT6?
The AES hardware accelerator supports 128/256-bit key encryption.
- Does the STM32L422RBT6 have any specific development support features?
Yes, it supports serial wire debug (SWD), JTAG, and Embedded Trace Macrocell™.
- What is the package type for the STM32L422RBT6?
The device is available in an LQFP 64 10x10x1.4 mm package.
- Is the STM32L422RBT6 compliant with any environmental standards?
Yes, it is ECOPACK2 compliant.
