STMicroelectronics ST72F324K2T6TR

Overview

ST72F324K2T6TR from STMicroelectronics is an 8-bit Flash microcontroller with 16KB program memory, 512 bytes RAM, 10-bit ADC (12-channel), 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 and -40°C to +125°C, targeting industrial motor control and sensor interface applications requiring robust I/O and in-application programming.

For engineers reviewing the ST72F324K2T6TR datasheet, ST72F324K2T6TR pinout, ST72F324K2T6TR application, or ST72F324K2T6TR equivalent, key selection considerations include its TQFP44 package, 24 multifunctional I/O lines, programmable low-voltage detector (LVD), four power-saving modes (Halt/Active-Halt/Wait/Slow), and HD-Flash endurance of 100 write/erase cycles with 20-year data retention at 55°C.

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. Power management includes enhanced LVD with programmable reset thresholds and auxiliary voltage detector (AVD) with interrupt capability - enabling reliable operation under brown-out and supply monitoring conditions.

Key Specifications

Pinout & Package

TQFP44 (10 mm × 10 mm, 0.8 mm pitch) package with exposed thermal pad; 44-pin quad flat pack suitable for automated SMT assembly and high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ST72F324K2T6TR, the ST72F324B2T6TR delivers direct hardware compatibility with enhanced Flash longevity, while the STM8S105K4T6C trades pin compatibility for modern toolchain support, faster execution, and embedded EEPROM - making it suitable for next-generation designs where cost-per-feature and long-term maintainability are prioritized.

Availability

ST72F324K2T6TR is available at Aetrix Electronics and suitable for industrial motor control, smart sensor nodes, automotive body electronics, and PLC I/O expansion requiring stable component supply and long-lifecycle support.

Supply support for ST72F324K2T6TR 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 management ICs, sensors, and automotive-grade components.

The ST7 family was engineered for cost-sensitive, high-reliability 8-bit control applications in industrial and automotive environments - emphasizing robustness, low-power operation, and field-programmable Flash memory.

FAQ

Is ST72F324K2T6TR still recommended for new designs?

No - STMicroelectronics explicitly marks this device as "NOT FOR NEW DESIGN" in its official documentation. The ST72F324Bx series (e.g., ST72F324B2T6TR) is the designated replacement, offering improved Flash endurance, extended data retention, and updated qualification. Legacy designs may continue using ST72F324K2T6TR under controlled obsolescence management.

What programming interfaces does ST72F324K2T6TR support?

It supports In-Circuit Programming (ICP) via the ICC interface using dedicated pins (ICCSEL/VPP, RESET, and clock/data lines), and In-Application Programming (IAP) through its built-in SCI or SPI peripheral. No JTAG or SWD interface is present - debugging relies on single-wire SCI or proprietary ST7 debug protocols via ICC.

Does ST72F324K2T6TR include hardware PWM generation?

Yes - both 16-bit Timer A and Timer B support hardware PWM output in multiple modes, including center-aligned and edge-aligned configurations. Timer B provides two independent PWM channels with dead-time insertion capability, enabling direct control of half-bridge or full-bridge power stages without software intervention.

How is the 10-bit ADC calibrated for accuracy?

The ADC includes factory-trimmed offset and gain calibration values stored in reserved Flash locations. During initialization, firmware loads these values into dedicated ADC calibration registers (ADCCALH/ADCCALL) to achieve ±1 LSB INL and DNL across the operating temperature range - no user calibration routine is required for typical industrial accuracy needs.