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STM32L432 User Reference Manual Guide

Part Series:STM32L432 Series
Description:MCU 32Bit ARM Cortex M4 RISC 128KB Flash 2.5V/3.3V 32Pin UFQFPN EP Tray
Document:STM32L432KBU6 User Reference Manual Guide (1418 Pages)

STM32L432 Microcontrollers User Reference Manual Guide

STM32L432KBU6 - ST Microelectronics Specifications

80 MHz
Number of Pins
32 Pin
Number of Positions
32 Position
RAM Memory Size
64 KB
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STM32L432KBU6 - ST Microelectronics Function Overview

The STM32L432xx 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 STM32L432xx devices embed high-speed memories ( Flash memory up to 256 Kbyte, 64 Kbyte of SRAM), a Quad SPI flash memories interface 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 STM32L432xx 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, twoDAC channels, 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 3 capacitive sensing channels are available.
They also feature standard and advanced communication interfaces.
Key Features
Ultra-low-power with FlexPowerControl
1.71 V to 3.6 V power supply
-40 °C to 85/105/125 °C temperature range
8 nA Shutdown mode (2 wakeup pins)
28 nA Standby mode (2 wakeup pins)
280 nA Standby mode with RTC
1.0 μA Stop 2 mode, 1.28 μA with RTC
84 μA/MHz run 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
176.7 ULPBench® score
Clock Sources
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
2 PLLs for system clock, USB, audio, ADC
Up to 26 fast I/Os, most 5 V-tolerant
RTC with HW calendar, alarms and calibration
Up to 3 capacitive sensing channels
11x timers: 1x 16-bit advanced motor-control, 1x 32-bit and 2x 16-bit general purpose, 2x 16-bit basic, 2x low-power 16-bit timers (available in Stop mode), 2x watchdogs, SysTick timer
Up to 256 KB single bank Flash, proprietary code readout protection
64 KB of SRAM including 16 KB with hardware parity check
Quad SPI memory interface
Rich analog peripherals (independent supply)
1× 12-bit ADC 5 Msps, up to 16-bit with hardware oversampling, 200 μA/Msps
2x 12-bit DAC, low-power sample and hold
1x operational amplifier with built-in PGA
2x ultra-low-power comparators
14x communication interfaces
USB 2.0 full-speed crystal less solution with LPM and BCD
1x SAI (serial audio interface)
2x I2C FM+(1 Mbit/s), SMBus/PMBus
3x USARTs (ISO 7816, LIN, IrDA, modem)
1x LPUART (Stop2 wake-up)
2x SPIs (3x SPIs with the Quad SPI)
CAN (2.0B Active)
SWPMI single wire protocol master I/F
IRTIM (Infrared interface)
14-channel DMA controller
True random number generator
CRC calculation unit, 96-bit unique ID
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