This is information on a product in full production.
September 2021 DS12231 Rev 4 1/136
STM32G081xB
Arm
®
Cortex
®
-M0+ 32-bit MCU, 128 KB Flash, 36 KB RAM,
4x USART, timers, ADC, DAC, comm. I/Fs, AES, RNG, 1.7-3.6V
Datasheet - production data
Features
• Core: Arm
®
32-bit Cortex
®
-M0+ CPU,
frequency up to 64 MHz
• -40°C to 85°C/105°C/125°C operating
temperature
• Memories
– 128 Kbytes of Flash memory with
protection and securable area
– 36 Kbytes of SRAM (32 Kbytes with HW
parity check)
• CRC calculation unit
• Reset and power management
– Voltage range: 1.7 V to 3.6 V
– Power-on/Power-down reset (POR/PDR)
– Programmable Brownout reset (BOR)
– Programmable voltage detector (PVD)
– Low-power modes:
Sleep, Stop, Standby, Shutdown
–V
BAT
supply for RTC and backup registers
• Clock management
– 4 to 48 MHz crystal oscillator
– 32 kHz crystal oscillator with calibration
– Internal 16 MHz RC with PLL option (±1 %)
– Internal 32 kHz RC oscillator (±5 %)
• Up to 60 fast I/Os
– All mappable on external interrupt vectors
– Multiple 5 V-tolerant I/Os
• 7-channel DMA controller with flexible mapping
• 12-bit, 0.4 µs ADC (up to 16 ext. channels)
– Up to 16-bit with hardware oversampling
– Conversion range: 0 to 3.6V
• Two 12-bit DACs, low-power sample-and-hold
• Two fast low-power analog comparators, with
programmable input and output, rail-to-rail
• 14 timers (two 128 MHz capable): 16-bit for
advanced motor control, one 32-bit and five 16-
bit general-purpose, two basic 16-bit, two low-
power 16-bit, two watchdogs, SysTick timer
• Calendar RTC with alarm and periodic wakeup
from Stop/Standby/Shutdown
• Communication interfaces
–Two I
2
C-bus interfaces supporting Fast-
mode Plus (1 Mbit/s) with extra current
sink, one supporting SMBus/PMBus and
wakeup from Stop mode
– Four USARTs with master/slave
synchronous SPI; two supporting ISO7816
interface, LIN, IrDA capability, auto baud
rate detection and wakeup feature
– One low-power UART
– Two SPIs (32 Mbit/s) with 4- to 16-bit
programmable bitframe, one multiplexed
with I
2
S interface
– HDMI CEC interface, wakeup on header
• USB Type-C™ Power Delivery controller
• True random number generator (RNG)
• AES encryption with 128/256-bit key
• Development support: serial wire debug (SWD)
• 96-bit unique ID
• All packages ECOPACK
2 compliant
Table 1. Device summary
Reference Part number
STM32G081xB
STM32G081CB, STM32G081EB,
STM32G081GB, STM32G081KB,
STM32G081RB
LQFP64
UFQFPN48
UFQFPN32
UFQFPN28
LQFP48
LQFP32
WLCSP25
2.3 × 2.5 mm
UFBGA64
5
×
5mm
10
×
10 mm
7
×
7mm
7
×
7mm
7 × 7 mm
5×5mm
4×4mm
www.st.com
Contents STM32G081xB
2/136 DS12231 Rev 4
Contents
1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3 Functional overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.1 Arm
®
Cortex
®
-M0+ core with MPU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.2 Memory protection unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.3 Embedded Flash memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.3.1 Securable area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.4 Embedded SRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
3.5 Boot modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
3.6 Cyclic redundancy check calculation unit (CRC) . . . . . . . . . . . . . . . . . . . 16
3.7 Power supply management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
3.7.1 Power supply schemes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
3.7.2 Power supply supervisor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
3.7.3 Voltage regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
3.7.4 Low-power modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
3.7.5 Reset mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
3.7.6 VBAT operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
3.8 Interconnect of peripherals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
3.9 Clocks and startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
3.10 General-purpose inputs/outputs (GPIOs) . . . . . . . . . . . . . . . . . . . . . . . . . 22
3.11 Direct memory access controller (DMA) . . . . . . . . . . . . . . . . . . . . . . . . . . 23
3.12 DMA request multiplexer (DMAMUX) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
3.13 Interrupts and events . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
3.13.1 Nested vectored interrupt controller (NVIC) . . . . . . . . . . . . . . . . . . . . . . 24
3.13.2 Extended interrupt/event controller (EXTI) . . . . . . . . . . . . . . . . . . . . . . 24
3.14 Analog-to-digital converter (ADC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
3.14.1 Temperature sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
3.14.2 Internal voltage reference (V
REFINT
) . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
3.14.3 V
BAT
battery voltage monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
3.15 Digital-to-analog converter (DAC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
3.16 Voltage reference buffer (VREFBUF) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
