STM32L422RBI6 STMicroelectronics 32bit MCU

STM32L422RBI6 Overview

The STM32L422xx devices are the ultra-low-power microcontrollers based on the high-performance Arm® Cortex®-M4 32-bit RISC core operating at a frequency of up to 80 MHz. The Cortex-M4 core features a Floating point unit (FPU) single precision which supports all Arm® single-precision data-processing instructions and data types. It also implements a full set of DSP instructions and a memory protection unit (MPU) which enhances application security.

The STM32L422xx devices embed high-speed memories (Flash memory up to 128 Kbyte,40 Kbyte of SRAM), a Quad SPI flash memories interface (available on all packages) and an extensive range of enhanced I/Os and peripherals connected to two APB buses, two AHB buses and a 32-bit multi-AHB bus matrix.
The STM32L422xx devices embed several protection mechanisms for embedded Flash memory and SRAM: readout protection, write protection, proprietary code readout protection and Firewall.
The devices offer two fast 12-bit ADC (5 Msps), two comparators, one operational amplifier, a low-power RTC, one general-purpose 32-bit timer, one 16-bit PWM timer dedicated to motor control, four general-purpose 16-bit timers, and two 16-bit low-power timers.
In addition, up to 12 capacitive sensing channels are available.
They also feature standard and advanced communication interfaces.
The STM32L422xx devices embed AES hardware accelerator.
The STM32L422xx operates in the -40 to +85 °C (+105 °C junction) and -40 to +125 °C (+130 °C junction) temperature ranges from a 1.71 to 3.6 V VDD power supply. A comprehensive set of power-saving modes allows the design of low-power applications.
Some independent power supplies are supported: analog independent supply input for ADC, OPAMP and comparator. A VBAT input allows to backup the RTC and backup registers.
The STM32L422xx family offers six packages from 32 to 64-pin packages.

Features

1.71 V to 3.6 V power supply
-40 °C to 85/125 °C temperature range
300 nA in VBAT mode: supply for RTC and 32x32-bit backup registers
16 nA Shutdown mode (4 wakeup pins)
32 nA Standby mode (4 wakeup pins)
245 nA Standby mode with RTC
0.7 μA Stop 2 mode, 0.95 μA with RTC
79 μA/MHz run mode (LDO Mode)
Batch acquisition mode (BAM)
4 μs wakeup from Stop mode
Brown out reset (BOR)
Interconnect matrix

Core: Arm 32-bit Cortex-M4 CPU with FPU, Adaptive real-time accelerator (ART Accelerator) allowing 0-wait-state execution from Flash memory, frequency up to 80 MHz, MPU, 100DMIPS and DSP instructions

Performance benchmark

1.25 DMIPS/MHz (Drystone 2.1)
273.55 CoreMark (3.42 CoreMark/MHz @ 80 MHz)

Energy benchmark

442 ULPMark-CP
165 ULPMark-PP

Clock Sources

4 to 48 MHz crystal oscillator
32 kHz crystal oscillator for RTC (LSE)
Internal 16 MHz factory-trimmed RC (±1%)
Internal low-power 32 kHz RC (±5%)
Internal multispeed 100 kHz to 48 MHz oscillator, auto-trimmed by LSE (better than ±0.25 % accuracy)
Internal 48 MHz with clock recovery
PLL for system clock

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

10x timers: 1x 16-bit advanced motor-control, 1x 32-bit and 2x 16-bit general purpose, 1x 16-bit basic, 2x low-power 16-bit timers (available in Stop mode), 2x watchdogs, SysTick timer