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
– VBAT 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 lowpower
16-bit, two watchdogs, SysTick timer
• Calendar RTC with alarm and periodic wakeup
from Stop/Standby/Shutdown
• Communication interfaces
– Two I2C-bus interfaces supporting Fastmode
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 I2S 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

Description
The STM32G081xB mainstream microcontrollers are based on high-performance
Arm® Cortex®-M0+ 32-bit RISC core operating at up to 64 MHz frequency. Offering a high
level of integration, they are suitable for a wide range of applications in consumer, industrial
and appliance domains and ready for the Internet of Things (IoT) solutions.
The devices incorporate a memory protection unit (MPU), high-speed embedded memories
(36 Kbytes of SRAM and 128 Kbytes of Flash program memory with read protection, write
protection, proprietary code protection, and securable area), DMA, an extensive range of
system functions, enhanced I/Os, and peripherals. The devices offer standard
communication interfaces (two I2Cs, two SPIs / one I2S, one HDMI CEC, and four USARTs),
one 12-bit ADC (2.5 MSps) with up to 19 channels, one 12-bit DAC with two channels, two
fast comparators, an internal voltage reference buffer, a low-power RTC, an advanced
control PWM timer running at up to double the CPU frequency, five general-purpose 16-bit
timers with one running at up to double the CPU frequency, a 32-bit general-purpose timer,
two basic timers, two low-power 16-bit timers, two watchdog timers, and a SysTick timer.
The devices provide a fully integrated USB Type-C Power Delivery controller.
The devices embed AES hardware accelerator and true random number generator (RNG).
The devices operate within ambient temperatures from -40 to 125°C and with supply
voltages from 1.7 V to 3.6 V. Optimized dynamic consumption combined with a
comprehensive set of power-saving modes, low-power timers and low-power UART, allows
the design of low-power applications.
VBAT direct battery input allows keeping RTC and backup registers powered.
The devices come in packages with 28 to 64 pins.