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The STM32L431xx devices are the ultra-low-power microcontrollers based on thehigh- 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 STM32L431xx devices embed high-speed memories (Flash memory up to 256 Kbyte, 64 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 STM32L431xx devices embed several protection mechanisms for embedded Flash memory and SRAM: readout protection, write protection, proprietary code readout protection and Firewall.
The devices offer a fast 12-bit ADC (5 Msps), two comparators, one operational amplifier, two DAC channels, an internal voltage reference buffer, 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 21 capacitive sensing channels are available.
They also feature standard and advanced communication interfaces.
.Three I2Cs
.Three SPIs
.Three USARTs and one Low-Power UART.
One SAl (Serial Audio Interfaces)
One SDMMC
One CAN
.One SWPMI (Single Wire Protocol Master Interface)
The STM32L431xx operates in the -40 to +85 C (+105 C junction), -40 to +105 C (+125 C junction)and -40 to +125*C(+130C junction) temperature ranges from a 1.71to 3.6 V 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, DAC, OPAMP and comparators. A VBAT input allows to backup the RTC and backup registers.
The STM32L431xx family offers nine packages from 32 to 100-pin packages.