STM32L412C8T6TR [STMicroelectronics]

The STM32L412xx devices are 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 that 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, namely 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 V_DD power supply when using internal LDO regulator and a 1.00 to 1.32V V_DD12 power supply when using external SMPS supply. A comprehensive set of power-saving modes makes possible the design of low-power applications.

Some independent power supplies are supported: analog independent supply input for ADC, OPAMP and comparator. A VBAT input makes it possible to backup the RTC and backup registers. Dedicated V_DD12 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.

• Includes ST state-of-the-art patented technology
  • 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 V_BAT 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
    
    
    • 1x operational amplifier with built-in PGA
    
    
    • 1x ultra-low-power comparator
    
    
  • 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
    
  • CRC calculation unit, 96-bit unique ID
    
  • Development support: serial wire debug (SWD), JTAG, Embedded Trace Macrocell™
    
  • All packages are ECOPACK2 compliant