STMicroelectronics STM32F318K8U6

Overview

STM32F318K8U6 from STMicroelectronics is an Arm® Cortex®-M4 32-bit microcontroller with FPU, 64 KB Flash, 16 KB SRAM, integrated 12-bit DAC, three rail-to-rail comparators, and one programmable-gain operational amplifier. It operates at up to 72 MHz, supports 1.8 V ±8% supply, and targets analog-intensive embedded control applications such as motor sensing, industrial signal conditioning, and capacitive touch interfaces.

For engineers reviewing the STM32F318K8U6 datasheet, STM32F318K8U6 pinout, STM32F318K8U6 application, or STM32F318K8U6 equivalent, key selection criteria include its 1.8 V core voltage tolerance, on-chip op-amp with PGA mode, 36 fast I/Os (5 V-tolerant), and dual-domain USART with ISO 7816 support for secure peripheral interfacing.

Technical Context

The STM32F318K8U6 integrates a Cortex-M4 core with single-cycle MAC and hardware division, enabling real-time DSP operations in sensor fusion and motor control loops. Its analog subsystem includes a dedicated 2.4–3.6 V analog supply domain supporting simultaneous operation of ADC, DAC, COMP, and OPAMP.

It features an interconnect matrix for concurrent peripheral access, a 7-channel DMA controller servicing ADC, SPI, I2C, USART, and DAC, and a flexible clock tree with four oscillator sources (HSE, LSE, HSI, LSI) plus PLL for precise timing across mixed-signal workloads.

Key Specifications

Pinout & Package

STM32F318K8U6 is housed in a 32-pin UFQFPN package (5 × 5 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are validated per ST's DS10315 Rev 7 datasheet Section 4 (Pinouts and pin description), including dedicated VDDA/VSSA analog supply pins, separate VREF+ for ADC/DAC, and fully accessible OPAMP_INP/INN/OUT pins.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32F318K8U6, the STM32F303K8U6 trades DAC functionality for additional ADC channels-ideal for pure sensing-but lacks the integrated DAC needed for closed-loop biasing. The STM32G431K8U6 offers superior analog integration and speed but increases cost and power; it is optimal when migrating beyond basic FOC or adding secondary analog control paths.

Availability

STM32F318K8U6 is available at Aetrix Electronics and suitable for industrial motor drives, smart sensor transmitters, capacitive touch interfaces, and energy-monitoring outlets requiring stable component supply across long production lifecycles.

Supply support for STM32F318K8U6 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 analog/mixed-signal ICs for industrial, automotive, and consumer markets.

The STM32F3 series targets cost-sensitive, analog-rich embedded applications-designed to integrate precision signal conditioning, real-time control, and human interface functions into a single 1.8 V-compatible MCU.

FAQ

What is the maximum operating frequency and supported voltage range for the STM32F318K8U6?

The STM32F318K8U6 operates at up to 72 MHz with a core supply of 1.8 V ±8% (1.656–1.944 V). Its analog peripherals accept VDDA from 1.8 V to 3.6 V, enabling flexible partitioning of analog/digital power domains. This dual-voltage architecture supports direct connection to 2-cell LiFePO₄ batteries (≈3.6 V) while maintaining 1.8 V logic integrity.

Does the STM32F318K8U6 support hardware-accelerated cryptographic functions?

No. The STM32F318K8U6 does not include a cryptographic accelerator or TRNG. It lacks AES, SHA, or PKA engines found in STM32L4/L5 or STM32H7 series. Security relies on software libraries (e.g., Mbed TLS) running on the Cortex-M4 FPU, suitable for lightweight authentication but not high-throughput encryption.

Can the integrated op-amp be configured as a programmable-gain amplifier (PGA)?

Yes. The single op-amp supports PGA mode with gains of 1, 2, 4, 8, 16, 32, 64, or 100 via internal switch matrices controlled by OPAMPx_CSR register bits. All terminals (INP, INN, OUT) are externally accessible, allowing external feedback networks for non-standard gains or filtering.

What debug interfaces are supported, and is SWD sufficient for full development?

The STM32F318K8U6 supports Serial Wire Debug (SWD) and JTAG via the SWJ-DP interface. SWD is fully sufficient for programming, real-time tracing, and breakpoint debugging-it uses only SWCLK and SWDIO pins, minimizing PCB routing overhead versus full JTAG. No external debug probe license is required for standard ST-LINK tools.