STMicroelectronics ST72F324K2T6

Overview

ST72F324K2T6 from STMicroelectronics is an 8-bit microcontroller featuring 16KB Flash memory, 512 bytes RAM, 10-bit ADC with up to 12 input channels, dual 16-bit timers (Timer A and Timer B), SPI and SCI serial interfaces, and PLL-based clock multiplication. It operates across 3.8V–5.5V supply and supports industrial temperature range (−40°C to +125°C) in TQFP44 package. Used in motor control subsystems requiring deterministic real-time response and low-power operation.

For engineers reviewing the ST72F324K2T6 datasheet, ST72F324K2T6 pinout, ST72F324K2T6 application, or ST72F324K2T6 equivalent, this page delivers verified technical context, validated pin functions, confirmed peripheral timing behavior, and documented alternative selection guidance for legacy embedded designs.

Technical Context

This MCU implements a Harvard architecture with 63 basic instructions and 17 addressing modes, including 8×8 unsigned multiply. Its nested interrupt controller supports 10 vectors plus TRAP and RESET, with up to 9 external interrupt lines mapped across 4 vectors.

The clock system integrates crystal/ceramic resonator oscillators, internal RC oscillator, clock security system, and a 2× PLL multiplier. Four power-saving modes-Halt, Active-Halt, Wait, and Slow-are managed via dedicated registers and supported by LVD/AVD voltage monitoring with programmable thresholds and interrupt capability.

Key Specifications

Pinout & Package

TQFP44 (10 mm × 10 mm, 0.8 mm pitch) package with exposed thermal pad; RoHS-compliant, lead-free finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ST72F324K2T6, ST72F324B2T6 offers drop-in reliability upgrades while STM8S105K4T6 provides architectural modernization at the cost of hardware requalification - both require validation of ADC linearity, timer jitter, and LVD trip point stability in target operating conditions.

Availability

ST72F324K2T6 is available at Aetrix Electronics and suitable for industrial motor control, automotive body electronics, smart metering, and PLC I/O modules requiring stable component supply across extended product lifecycles.

Supply support for ST72F324K2T6 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 industrial, automotive, and consumer markets.

The ST7 family was engineered for cost-sensitive, real-time embedded control applications demanding low power, high noise immunity, and field-programmable Flash - particularly in motor drives and automotive sub-systems prior to the STM8 transition.

FAQ

Is ST72F324K2T6 still in active production?

No - STMicroelectronics marked ST72F324Kx as "Not for New Design" in April 2008. Aetrix Electronics maintains legacy inventory and supports last-time-buy programs with full traceability, but recommends ST72F324Bx or STM8S105K4T6 for new designs per ST's official migration path.

What debugging interfaces does ST72F324K2T6 support?

It supports In-Circuit Programming (ICP) via the ICC interface using the STVP programming software and ST-LINK-compatible adapters. No SWIM or JTAG is available; debugging relies on ROM monitor, printf-style UART output, and hardware breakpoints set through the ICCSEL/VPP pin configuration.

Can the 10-bit ADC operate during Low Power Modes?

Yes - the ADC remains functional in Wait and Active-Halt modes, enabling wake-up-on-conversion. However, it is disabled in Halt and Slow modes. Sample-and-hold timing and conversion accuracy are preserved only when the main clock or prescaled derivative remains active.

How is the PLL synchronized after power-up?

The PLL requires explicit software enable and lock detection via the PLLCSR register. After enabling, firmware must poll the LOCK bit (bit 0) until set - typical lock time is 100 µs with 4 MHz crystal input. Failure to verify lock results in undefined CPU clock behavior.