STMicroelectronics ST7FOXK2T6

Overview

ST7FOXK2T6 from STMicroelectronics is an 8-bit Flash microcontroller featuring 8 Kbytes of single-voltage XFlash program memory, 384 bytes of RAM, integrated SPI and I²C interfaces, a 10-bit ADC with up to 10 input channels, and six timers-including dual 12-bit auto-reload timers with PWM and dead-time generation-targeted for cost-sensitive industrial control and sensor interface applications.

For engineers reviewing the ST7FOXK2T6 datasheet, ST7FOXK2T6 pinout, ST7FOXK2T6 application, or ST7FOXK2T6 equivalent, key selection considerations include its 8 MHz internal RC oscillator with trimming, five low-power modes (Halt, Active-Halt, Auto Wakeup from Halt, Wait, Slow), high-sink I/O capability (up to 8 pins), and in-application programming (IAP) support for field firmware updates.

Technical Context

The ST7FOXK2T6 implements a Harvard-architecture 8-bit CPU with 63 basic instructions, 17 addressing modes, and hardware 8×8 unsigned multiply. Its clock system integrates a trimmable 8 MHz RC oscillator, auto-wakeup low-frequency oscillator, and external crystal/ceramic or clock input support-managed via dedicated RCC_CSR, MCCSR, and CKCNTCSR registers.

Interrupt handling supports 13 vectors plus TRAP and RESET, with software-configurable priority via ISPRx registers. Peripheral timing is synchronized through a centralized prescaler (PSCR) and independent timer control registers-including AWUCSR for auto-wakeup events and dual 12-bit timer mode configuration registers enabling enhanced one-pulse and input capture functions.

Key Specifications

Pinout & Package

LQFP32 package (7 × 7 mm, 0.8 mm pitch) with 32-pin quad flat lead-free封装. Pin functions mapped per ST's official pin description table (Section 2, p.15).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM8S003F3P6 and EFM8BB10F8G-A-QSOP24, the ST7FOXK2T6 uniquely balances Flash endurance, IAP reliability, and multi-voltage operation (2.95–5.5 V) for long-lifecycle industrial deployments where firmware update integrity and wide supply tolerance are non-negotiable.

Availability

ST7FOXK2T6 is available at Aetrix Electronics and suitable for industrial sensor nodes, smart HVAC actuators, programmable power supply monitors, and legacy equipment retrofit controllers requiring stable component supply across extended product lifecycles.

Supply support for ST7FOXK2T6 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 devices, sensors, and analog ICs for automotive, industrial, and consumer markets.

The ST7 family was engineered specifically for cost-optimized, low-power 8-bit control in industrial automation, appliance control, and sensor interface applications-prioritizing Flash reliability, mixed-signal integration, and robustness in harsh electrical environments.

FAQ

Does ST7FOXK2T6 support true in-system programming (ISP) via its ICC interface?

Yes. The ST7FOXK2T6 implements an on-chip ICC (In-Circuit Communication) interface compliant with ST's standard protocol, enabling full Flash erase, program, and verification using a 4-wire connection (VDD, VSS, ICCCLK, ICCDAT). This allows programming after soldering without removing the device from the PCB, provided the target board supplies regulated VDD and exposes the ICC pins.

What is the maximum guaranteed ADC accuracy across temperature and supply voltage?

The ST7FOXK2T6 ADC achieves ±2 LSB integral nonlinearity (INL) and ±1.5 LSB differential nonlinearity (DNL) over the full operating range (–40 to +85 °C, VDD = 2.95–5.5 V), as specified in Section 12.11 of the datasheet. Calibration is factory-performed; no user trimming is required for this accuracy level.

Can the internal 8 MHz RC oscillator be trimmed in-circuit, and what is the achievable accuracy?

Yes. The RCCRH/RCCRL registers allow real-time adjustment of the internal RC oscillator frequency in steps of approximately 0.5%, achieving ±1% accuracy over temperature and voltage when calibrated against an external reference (e.g., crystal or scope-measured signal). Trim values persist across power cycles if stored in option bytes.

Is the ST7FOXK2T6 pin-compatible with other ST7FOX variants like ST7FOXK1 or ST7FOXF1?

No. While sharing the same LQFP32 package, ST7FOXK2T6 has distinct pin mappings for peripheral functions (e.g., I²C SDA/SCL, SPI MOSI/MISO) versus ST7FOXK1 and ST7FOXF1. Pin compatibility is limited to power (VDD/VSS), reset, and basic I/O; peripheral routing and alternate function assignments differ and require schematic review per device-specific pin description tables.