STM32L412CBU6 Description

The STM32L412CBU6 device is an ultra-low-power microcontroller built around the powerful 32-bit RISC Arm? Cortex?-M4 core that can operate at up to 80 MHz. A floating point unit (FPU) single precision is a characteristic of the Cortex-M4 core that supports all Arm? single-precision data-processing instructions and data formats. Additionally, it incorporates a memory protection unit (MPU) that improves program security together with the whole range of DSP instructions.

The STM32L412CBU6 device integrates high-speed memories, including Flash memory up to 128 KBytes and 40 KBytes of SRAM, a Quad SPI flash memories interface (available on all packages), and a wide variety of enhanced I/Os and peripherals connected to two APB buses, two AHB buses, and a 32-bit multi-AHB bus matrix.

The STM32L412CBU6 device includes a number of readout protection, write protection, proprietary code readout protection, and firewall protection techniques for embedded Flash memory and SRAM.

Two fast 12-bit ADCs (5 Msps), two comparators, one operational amplifier, a low-power RTC, a general-purpose 32-bit timer, a motor control-specific 16-bit PWM timer, four general-purpose 16-bit timers, and two 16-bit low-power timers are all included in the devices.

Furthermore, there are up to 12 capacitive sensing channels available.

STM32L412CBU6 Features

• 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 V or 2.048 V reference voltage buffered output

• 12x communication interfaces

– USB 2.0 full-speed crystal less solution with LPM and BCD

– 3x I2C FM+(1 Mbit/s), SMBus/PMBus

– 3x USARTs (ISO 7816, LIN, IrDA, modem)

– 1x LPUART (Stop 2 wake-up)

– 2x SPIs (and 1x Quad SPI)

– IRTIM (Infrared interface)

• 14-channel DMA controller

• True random number generator

• 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

STM32L412CBU6 Applications

• Automobile engine control systems

• Implantable medical devices

• Remote controls

• Office machines

• Appliances