STMicroelectronics ST7FOXK2B6

Overview

ST7FOXK2B6 from STMicroelectronics is an 8-bit Flash microcontroller featuring 8 KB XFlash program memory, 384 bytes RAM, integrated SPI and I²C interfaces, 10-bit ADC with up to 10 channels, six timers (including dual 12-bit auto-reload timers with 4 PWM outputs), and five power-saving modes. It operates from a single supply (2.95–5.5 V), includes internal 8 MHz RC oscillator with trimming, low-voltage detector, and supports In-Circuit Programming (ICP) and In-Application Programming (IAP). It targets cost-sensitive embedded control in industrial sensors and appliance motor management.

For engineers reviewing the ST7FOXK2B6 datasheet, ST7FOXK2B6 pinout, ST7FOXK2B6 application, or ST7FOXK2B6 equivalent, key selection considerations include its 8 KB XFlash endurance (1k write/erase cycles), 20-year data retention at 55 °C, dual 12-bit timer PWM capability, high-sink I/O (up to 8 pins), and support for auto-wakeup from Halt mode via internal low-power oscillator.

Technical Context

The ST7FOXK2B6 implements the ST7 CPU core with 63 basic instructions, 17 addressing modes, and illegal opcode detection. Its clock system integrates three oscillators: trimmable 8 MHz RC, auto-wakeup low-frequency RC, and external crystal/resonator support - enabling dynamic switching between performance and ultra-low-power operation.

Interrupt handling supports 13 vectors plus TRAP and RESET, with software-configurable priority and nested servicing. Peripheral control is register-mapped with dedicated modules for I²C multimaster, SPI synchronous serial, and 10-bit ADC with configurable sampling time and trigger sources.

Key Specifications

Pinout & Package

LQFP32 package (7 × 7 mm, 0.8 mm pitch) with 32-pin quad flat lead frame - suitable for automated SMT assembly and thermal management in compact industrial PCBs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit Flash microcontroller applications.

Compared with STM8S003F3P6 and EFM8BB10F8G-A-QFN20, the ST7FOXK2B6 uniquely combines wide supply range (2.95–5.5 V), auto-wakeup RC oscillator, and high-sink I/O in LQFP32 - making it optimal for direct-battery or unregulated industrial designs requiring minimal external components.

Availability

ST7FOXK2B6 is available at Aetrix Electronics and suitable for industrial sensor nodes, smart appliance control, energy metering interfaces, and building automation controllers requiring stable component supply across multi-year production cycles.

Supply support for ST7FOXK2B6 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 headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power ICs, sensors, and analog products for industrial, automotive, and consumer markets.

The ST7 family was engineered for cost-effective, low-power embedded control in resource-constrained applications - emphasizing Flash endurance, mixed-signal integration, and robustness in harsh electrical environments.

FAQ

Does ST7FOXK2B6 support debug interface and in-circuit programming?

Yes. The ST7FOXK2B6 supports In-Circuit Programming (ICP) via the ICC (In-Circuit Communication) interface using two dedicated pins (ICCLK and ICDAT). It also enables In-Application Programming (IAP) through firmware routines that reprogram Flash while the application runs - both methods require no external HV programming voltage and operate at standard VDD levels.

What is the maximum operating frequency and how is it configured?

The ST7FOXK2B6 achieves a maximum system clock of 8 MHz using its internal trimmed RC oscillator. Frequency is set via the Main Clock Control/Status Register (MCCSR) and can be switched dynamically between internal RC, external crystal, or external clock source. Crystal mode supports 1–8 MHz; RC oscillator accuracy is ±1% after factory trimming at 25 °C.

Can the 10-bit ADC perform conversions during low-power modes?

Yes. The ADC remains operational in Wait and Slow modes, and can be triggered by timer events or external interrupts. However, it is disabled in Halt and Active-Halt modes. Conversion time is 13 µs per sample (1 MHz ADC clock), and the result is stored in a 16-bit data register with configurable left/right alignment.

How does the dual 12-bit auto-reload timer support motor control?

Each 12-bit timer provides two independent output compare channels and one input capture channel. When configured in enhanced one-pulse mode with dead-time generation, they produce complementary PWM pairs with programmable delay - essential for preventing shoot-through in half-bridge or inverter topologies used in BLDC and stepper motor drives.