This is information on a product in full production.

May 2017 DocID025743 Rev 6 1/106

STM32F031x4 STM32F031x6

ARM

-based 32-bit MCU with up to 32 Kbyte Flash, 9 timers,

ADC and communication interfaces, 2.0 - 3.6 V

Datasheet - production data

Features

• Core: ARM

32-bit Cortex

-M0 CPU,

frequency up to 48 MHz

• Memories

– 16 to 32 Kbytes of Flash memory

– 4 Kbytes of SRAM with HW parity

• CRC calculation unit

• Reset and power management

– Digital and I/Os supply: 2.0 to 3.6 V

– Analog supply: V

DDA

= from V

to 3.6 V

– Power-on/Power-down reset (POR/PDR)

– Programmable voltage detector (PVD)

– Low power modes: Sleep, Stop and

Standby

–V

BAT

supply for RTC and backup registers

• Clock management

– 4 to 32 MHz crystal oscillator

– 32 kHz oscillator for RTC with calibration

– Internal 8 MHz RC with x6 PLL option

– Internal 40 kHz RC oscillator

• Up to 39 fast I/Os

– All mappable on external interrupt vectors

– Up to 26 I/Os with 5 V tolerant capability

• 5-channel DMA controller

• 1 × 12-bit, 1.0 µs ADC (up to 10 channels)

– Conversion range: 0 to 3.6V

– Separate analog supply from 2.4 up to

3.6 V

• Up to 9 timers

– 1 x 16-bit 7-channel advanced-control timer

for 6 channels PWM output, with deadtime

generation and emergency stop

– 1 x 32-bit and 1 x 16-bit timer, with up to 4

IC/OC, usable for IR control decoding

– 1 x 16-bit timer, with 2 IC/OC, 1 OCN,

deadtime generation and emergency stop

– 1 x 16-bit timer, with IC/OC and OCN,

deadtime generation, emergency stop and

modulator gate for IR control

– 1 x 16-bit timer with 1 IC/OC

– Independent and system watchdog timers

– SysTick timer: 24-bit downcounter

• Calendar RTC with alarm and periodic wakeup

from Stop/Standby

• Communication interfaces

– 1 x I

C interface, supporting Fast Mode

Plus (1 Mbit/s) with 20 mA current sink,

SMBus/PMBus, and wakeup from Stop

mode

– 1 x USART supporting master synchronous

SPI and modem control, ISO7816

interface, LIN, IrDA capability, auto baud

rate detection and wakeup feature

– 1 x SPI (18 Mbit/s) with 4 to 16

programmable bit frames, with I

S interface

multiplexed

• Serial wire debug (SWD)

• 96-bit unique ID

• Extended temperature range: -40 to +105°C

• All packages ECOPACK

Table 1. Device summary

Reference Part number

STM32F031x6

STM32F031C6, STM32F031E6,

STM32F031F6, STM32F031G6,

STM32F031K6

STM32F031x4

STM32F031C4, STM32F031F4,

STM32F031G4, STM32F031K4

UFQFPN32 5x5 mm

TSSOP20

UFQFPN28 4x4 mm

LQFP32 7x7 mm

LQFP48 7x7 mm

WLCSP25

2.1x2.1 mm

6.5x4.4 mm

www.st.com

Contents STM32F031x4 STM32F031x6

2/106 DocID025743 Rev 6

Contents

1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

3 Functional overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

3.1 ARM

-Cortex

-M0 core . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

3.2 Memories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

3.3 Boot modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

3.4 Cyclic redundancy check calculation unit (CRC) . . . . . . . . . . . . . . . . . . . 12

3.5 Power management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

3.5.1 Power supply schemes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

3.5.2 Power supply supervisors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

3.5.3 Voltage regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

3.5.4 Low-power modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

3.6 Clocks and startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

3.7 General-purpose inputs/outputs (GPIOs) . . . . . . . . . . . . . . . . . . . . . . . . . 14

3.8 Direct memory access controller (DMA) . . . . . . . . . . . . . . . . . . . . . . . . . . 15

3.9 Interrupts and events . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

3.9.1 Nested vectored interrupt controller (NVIC) . . . . . . . . . . . . . . . . . . . . . . 15

3.9.2 Extended interrupt/event controller (EXTI) . . . . . . . . . . . . . . . . . . . . . . 15

3.10 Analog-to-digital converter (ADC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

3.10.1 Temperature sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

3.10.2 Internal voltage reference (V

REFINT

) . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

3.10.3 V

BAT

battery voltage monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

3.11 Timers and watchdogs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

3.11.1 Advanced-control timer (TIM1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

3.11.2 General-purpose timers (TIM2, 3, 14, 16, 17) . . . . . . . . . . . . . . . . . . . . 17

3.11.3 Independent watchdog (IWDG) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

3.11.4 System window watchdog (WWDG) . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

3.11.5 SysTick timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

3.12 Real-time clock (RTC) and backup registers . . . . . . . . . . . . . . . . . . . . . . 19

3.13 Inter-integrated circuit interface (I

C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

3.14 Universal synchronous/asynchronous receiver/transmitter (USART) . . . 20