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This is information on a product in full production.

May 2018 DS11453 Rev 3 1/208

STM32L431xx

Ultra-low-power Arm

Cortex

-M4 32-bit MCU+FPU, 100DMIPS,

up to 256KB Flash, 64KB SRAM, analog, audio

Datasheet - production data

Features

• Ultra-low-power with FlexPowerControl

– 1.71 V to 3.6 V power supply

– -40 °C to 85/105/125 °C temperature range

– 200 nA in V

BAT

mode: supply for RTC and

32x32-bit backup registers

– 8 nA Shutdown mode (5 wakeup pins)

– 28 nA Standby mode (5 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

– 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

– 2 PLLs for system clock, audio, ADC

• Up to 83 fast I/Os, most 5 V-tolerant

• RTC with HW calendar, alarms and calibration

• Up to 21 capacitive sensing channels: support

touchkey, linear and rotary touch sensors

• 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

• Memories

– 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)

– 1x 12-bit ADC 5 Msps, up to 16-bit with

hardware oversampling, 200 µA/Msps

– 2x 12-bit DAC output channels, low-power

sample and hold

– 1x operational amplifier with built-in PGA

– 2x ultra-low-power comparators

• 16x communication interfaces

– 1x SAI (serial audio interface)

–3x I2C FM+(1 Mbit/s), SMBus/PMBus

– 4x USARTs (ISO 7816, LIN, IrDA, modem)

– 1x LPUART (Stop 2 wake-up)

– 3x SPIs (and 1x Quad SPI)

– CAN (2.0B Active) and SDMMC interface

– 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

UFBGA100 (7×7)

LQFP64 (10x10)

UFBGA64 (5x5)

LQFP48 (7x7)

LQFP100 (14x14)

WLCSP64

UFQFPN32 (5x5)

WLCSP49UFQFPN48 (7x7)

www.st.com

DS11453 Rev 3 3/208

STM32L431xx Contents

Contents

1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

2 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

3 Functional overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

3.1 Arm

Cortex

-M4 core with FPU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

3.2 Adaptive real-time memory accelerator (ART Accelerator™) . . . . . . . . . 17

3.3 Memory protection unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

3.4 Embedded Flash memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

3.5 Embedded SRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

3.6 Firewall . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

3.7 Boot modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

3.8 Cyclic redundancy check calculation unit (CRC) . . . . . . . . . . . . . . . . . . . 20

3.9 Power supply management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

3.9.1 Power supply schemes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

3.9.2 Power supply supervisor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

3.9.3 Voltage regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

3.9.4 Low-power modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

3.9.5 Reset mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

3.9.6 VBAT operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

3.10 Interconnect matrix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

3.11 Clocks and startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

3.12 General-purpose inputs/outputs (GPIOs) . . . . . . . . . . . . . . . . . . . . . . . . . 36

3.13 Direct memory access controller (DMA) . . . . . . . . . . . . . . . . . . . . . . . . . . 36

3.14 Interrupts and events . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

3.14.1 Nested vectored interrupt controller (NVIC) . . . . . . . . . . . . . . . . . . . . . . 37

3.14.2 Extended interrupt/event controller (EXTI) . . . . . . . . . . . . . . . . . . . . . . 37

3.15 Analog to digital converter (ADC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

3.15.1 Temperature sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

3.15.2 Internal voltage reference (VREFINT) . . . . . . . . . . . . . . . . . . . . . . . . . . 39

3.15.3 VBAT battery voltage monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

3.16 Digital to analog converter (DAC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Contents STM32L431xx

4/208 DS11453 Rev 3

3.17 Voltage reference buffer (VREFBUF) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

3.18 Comparators (COMP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

3.19 Operational amplifier (OPAMP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

3.20 Touch sensing controller (TSC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

3.21 Random number generator (RNG) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

3.22 Timers and watchdogs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

3.22.1 Advanced-control timer (TIM1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

3.22.2 General-purpose timers (TIM2, TIM15, TIM16) . . . . . . . . . . . . . . . . . . . 44

3.22.3 Basic timers (TIM6 and TIM7) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

3.22.4 Low-power timer (LPTIM1 and LPTIM2) . . . . . . . . . . . . . . . . . . . . . . . . 44

3.22.5 Infrared interface (IRTIM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

3.22.6 Independent watchdog (IWDG) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

3.22.7 System window watchdog (WWDG) . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

3.22.8 SysTick timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

3.23 Real-time clock (RTC) and backup registers . . . . . . . . . . . . . . . . . . . . . . 46

3.24 Inter-integrated circuit interface (I

C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

3.25 Universal synchronous/asynchronous receiver transmitter (USART) . . . 48

3.26 Low-power universal asynchronous receiver transmitter (LPUART) . . . . 49

3.27 Serial peripheral interface (SPI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

3.28 Serial audio interfaces (SAI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

3.29 Single wire protocol master interface (SWPMI) . . . . . . . . . . . . . . . . . . . . 51

3.30 Controller area network (CAN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

3.31 Secure digital input/output and MultiMediaCards Interface (SDMMC) . . . 52

3.32 Clock recovery system (CRS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

3.33 Quad SPI memory interface (QUADSPI) . . . . . . . . . . . . . . . . . . . . . . . . . 53

3.34 Development support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

3.34.1 Serial wire JTAG debug port (SWJ-DP) . . . . . . . . . . . . . . . . . . . . . . . . . 54

3.34.2 Embedded Trace Macrocell™ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

4 Pinouts and pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

5 Memory mapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

6 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84

6.1 Parameter conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84

DS11453 Rev 3 5/208

STM32L431xx Contents

6.1.1 Minimum and maximum values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84

6.1.2 Typical values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84

6.1.3 Typical curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84

6.1.4 Loading capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84

6.1.5 Pin input voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84

6.1.6 Power supply scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

6.1.7 Current consumption measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . 86

6.2 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86

6.3 Operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88

6.3.1 General operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88

6.3.2 Operating conditions at power-up / power-down . . . . . . . . . . . . . . . . . . 89

6.3.3 Embedded reset and power control block characteristics . . . . . . . . . . . 89

6.3.4 Embedded voltage reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

6.3.5 Supply current characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

6.3.6 Wakeup time from low-power modes and voltage scaling

transition times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111

6.3.7 External clock source characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . 114

6.3.8 Internal clock source characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . 119

6.3.9 PLL characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125

6.3.10 Flash memory characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127

6.3.11 EMC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128

6.3.12 Electrical sensitivity characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . 129

6.3.13 I/O current injection characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . 130

6.3.14 I/O port characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131

6.3.15 NRST pin characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136

6.3.16 Extended interrupt and event controller input (EXTI) characteristics . . 137

6.3.17 Analog switches booster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137

6.3.18 Analog-to-Digital converter characteristics . . . . . . . . . . . . . . . . . . . . . 138

6.3.19 Digital-to-Analog converter characteristics . . . . . . . . . . . . . . . . . . . . . 151

6.3.20 Voltage reference buffer characteristics . . . . . . . . . . . . . . . . . . . . . . . 156

6.3.21 Comparator characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158

6.3.22 Operational amplifiers characteristics . . . . . . . . . . . . . . . . . . . . . . . . . 159

6.3.23 Temperature sensor characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . 162

6.3.24 V

BAT

monitoring characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163

6.3.25 Timer characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163

6.3.26 Communication interfaces characteristics . . . . . . . . . . . . . . . . . . . . . . 164

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