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Product Details

Description

The STM32L412xx 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 STM32L412xx 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 STM32L412xx 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.

•

Three I2Cs

•

Two SPIs

•

Three USARTs and one Low-Power UART.

•

One USB full-speed device crystal less

The STM32L412xx 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 when using

internal LDO regulator and a 1.00 to 1.32V VDD12 power supply when using external SMPS

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. Dedicated VDD12 power supplies can be used to bypass the internal LDO

regulator when connected to an external SMPS.

The STM32L412xx family offers six packages from 32 to 64-pin packages.

Features
• Ultra-low-power with FlexPowerControl
– 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)
– 28 μA/MHz run mode (@3.3 V SMPS
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
• Memories
– 128 KB single bank Flash, proprietary code
readout protection
– 40 KB of SRAM including 8 KB with
hardware parity check
– Quad SPI memory interface with XIP
capability
• Rich analog peripherals (independent supply)
– 2x 12-bit ADC 5 Msps, up to 16-bit with
hardware oversampling, 200 µA/Msps
– 2x operational amplifiers with built-in PGA
– 1x ultra-low-power comparator
– Accurate 2.5