STMicroelectronics STM32G031K8U7

Overview

STM32G031K8U7 from STMicroelectronics is a 32-bit Arm® Cortex®-M0+ microcontroller in UFQFPN32 package, operating up to 64 MHz with 64 KB Flash, 8 KB SRAM, and integrated 12-bit ADC (0.4 µs conversion), dual USARTs (one with ISO7816/LIN/IrDA), and two I²C interfaces supporting Fast-mode Plus (1 Mbit/s). It targets cost-sensitive industrial control and smart sensor nodes requiring low-power operation down to Shutdown mode (200 nA) and RTC-backed timekeeping.

For engineers reviewing the STM32G031K8U7 datasheet, STM32G031K8U7 pinout, STM32G031K8U7 application, or STM32G031K8U7 equivalent, key selection criteria include its 64 MHz CPU frequency, 5 V-tolerant GPIOs, hardware CRC unit, programmable Brownout reset (BOR), and support for SWD debug - all validated for -40°C to 85°C operation with 1.7–3.6 V supply range.

Technical Context

The STM32G031K8U7 integrates an Arm Cortex-M0+ core with Memory Protection Unit (MPU), enabling secure partitioning of code and data. Its clock system combines internal 16 MHz RC (±1 %) with PLL, 4–48 MHz HSE, and 32 kHz LSE with calibration - allowing precise timing for RTC and low-power wakeups.

Peripheral interconnect uses a dedicated AHB/APB matrix supporting concurrent DMA transfers across 5-channel controller, with flexible mapping to timers (including 128 MHz-capable TIM1), ADC, and communication interfaces. All 28 GPIOs are mappable to external interrupt vectors, and 22 are 5 V-tolerant - critical for mixed-voltage system interfacing.

Key Specifications

Pinout & Package

STM32G031K8U7 is housed in a 5 × 5 mm UFQFPN32 (A0B8) package with 0.5 mm pitch, exposing 28 GPIOs, 3 power pins (VDD, VSS, VDDA), 2 reset/debug pins (NRST, SWDIO/SWCLK), and dedicated analog/oscillator pins (VREF+, VREF-, OSC_IN/OSC_OUT, LSE_IN/LSE_OUT).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microcontroller applications.

Compared with STM32G031K8U7, the G030 variant trades security and analog precision for lower cost, while the G041 adds USB at the expense of LPUART and thermal performance - making the G031 the balanced choice for secure, low-power, sensor-rich edge nodes.

Availability

STM32G031K8U7 is available at Aetrix Electronics and suitable for industrial sensor nodes, smart meter interfaces, motor control actuators, and IoT edge gateways requiring stable component supply across extended product lifecycles.

Supply support for STM32G031K8U7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader specializing in microcontrollers, power management, and sensing technologies, with broad automotive and industrial qualification expertise.

The STM32G0 series targets cost-optimized, low-power embedded applications - designed for rapid development of secure, energy-efficient devices in resource-constrained environments.

FAQ

What is the maximum operating frequency and supported voltage range?

The STM32G031K8U7 operates at up to 64 MHz and supports a supply voltage range of 1.7 V to 3.6 V. This range accommodates single-cell lithium batteries and standard 3.3 V rails. The internal 16 MHz RC oscillator maintains ±1 % accuracy across temperature and voltage, enabling reliable clocking without external crystal in many applications.

Does it support hardware encryption or secure boot features?

While the STM32G031K8U7 does not include dedicated cryptographic accelerators (AES/RSA), it supports secure boot via Readout Protection (ROP) Levels 1 and 2, securable flash area, and hardware write protection. These features prevent unauthorized firmware extraction and enforce trusted execution - sufficient for basic IP protection and anti-cloning in industrial devices.

How many 5 V-tolerant I/O pins does it have, and which ones are they?

The STM32G031K8U7 has 22 5 V-tolerant I/O pins, including all PA and PB port pins except PA13 (SWDIO), PA14 (SWCLK), and PB2 (BOOT1). This tolerance allows direct interfacing with 5 V logic peripherals (e.g., legacy sensors, displays, or level translators) without external voltage shifters - reducing BOM cost and board space.

Can it drive an external 32.768 kHz RTC crystal, and what accuracy is guaranteed?

Yes, the STM32G031K8U7 includes dedicated LSE_IN/LSE_OUT pins and supports 32.768 kHz crystals with factory-calibrated trimming. Over the -40°C to +85°C range, the RTC achieves ±20 ppm accuracy with proper PCB layout and load capacitance matching (12.5 pF typical), enabling reliable calendar timekeeping and periodic wakeups from Stop/Standby modes.