STMicroelectronics ST72F324LJ6T6

Overview

ST72F324LJ6T6 from STMicroelectronics is an 8-bit Flash-based microcontroller with 32KB HD-Flash program memory, 1024 bytes RAM, 10-bit ADC (12-channel), four 16-bit timers (including RTC/beeper), SPI and SCI serial interfaces, and operation across 2.85–3.6V at -40°C to +85°C in LQFP44 package. It targets embedded control in industrial sensors and motor drive monitoring systems requiring low-voltage robustness and mixed-signal integration.

For engineers reviewing the ST72F324LJ6T6 datasheet, ST72F324LJ6T6 pinout, ST72F324LJ6T6 application, or ST72F324LJ6T6 equivalent, key selection criteria include its dual-voltage HD-Flash endurance (100 write cycles, 40-year data retention at 85°C), nested interrupt controller with 10 vectors, and configurable power-saving modes (Halt, Active-Halt, Wait, Slow) for battery-sensitive deployments.

Technical Context

This MCU implements a Harvard architecture with 63 basic instructions and 17 addressing modes, including 8×8 unsigned multiply. Its clock system integrates internal RC, external crystal/ceramic resonator, and bypassed external clock inputs, plus a PLL for 2× frequency multiplication - enabling precise timing control for real-time base generation and beep tone synthesis.

The peripheral set includes two independent 16-bit timers (Timer A with PWM/output compare/input capture; Timer B with dual input capture/dual output compare), a main clock controller with real-time base, beeper, and clock-out functions, and a 10-bit successive-approximation ADC supporting up to 12 analog inputs with programmable sampling time and conversion trigger sources.

Key Specifications

Pinout & Package

LQFP44 (10 × 10 mm, 0.8 mm pitch) package with exposed thermal pad; RoHS-compliant, moisture sensitivity level 3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM8S105K4T6 and EFM8BB52F16G-A-QFP48, the ST72F324LJ6T6 offers unique value in legacy industrial systems where HD-Flash data retention at 85°C and beeper-driven HMI feedback are design-critical, while maintaining pin-compatible upgrade paths within the ST7 family.

Availability

ST72F324LJ6T6 is available at Aetrix Electronics and suitable for industrial sensor nodes, motor drive monitors, PLC I/O modules, and smart power meter interfaces requiring stable component supply and long-term lifecycle assurance.

Supply support for ST72F324LJ6T6 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 microcontroller family was engineered for cost-sensitive, low-power embedded control applications demanding high reliability, integrated analog peripherals, and robust flash memory - especially in industrial automation and appliance control.

FAQ

What is the maximum operating frequency of the ST72F324LJ6T6?

The ST72F324LJ6T6 achieves a maximum system clock frequency of 8 MHz when using an external crystal oscillator. With its internal PLL enabled, it supports 2× frequency multiplication - allowing a 4 MHz crystal to generate an 8 MHz CPU clock. The internal RC oscillator operates at 1 MHz (±10%) and is suitable for non-critical timing tasks like watchdog or slow-mode operation.

Does the ST72F324LJ6T6 support in-system programming (ISP)?

Yes, the ST72F324LJ6T6 supports In-Circuit Programming (ICP) via the dedicated ICC interface using the ICCSEL/VPP pin and a standard ST programming tool. It also supports In-Application Programming (IAP), enabling firmware updates through the onboard SCI or SPI interface without halting system operation - essential for remote maintenance of deployed equipment.

How many interrupt vectors does the ST72F324LJ6T6 provide?

The ST72F324LJ6T6 features a nested interrupt controller with 10 dedicated interrupt vectors, plus separate TRAP and RESET vectors. External interrupts are consolidated across four vectors (INT0–INT3), with up to nine external interrupt lines assignable to these vectors. Each vector supports programmable priority levels, enabling deterministic handling of time-critical events like ADC end-of-conversion or timer overflow.

Is the ST72F324LJ6T6 pin-compatible with other ST72324Lxx variants?

Yes - the ST72F324LJ6T6 in LQFP44 package shares identical pinout with other ST72324Lxx devices in the same package variant (e.g., ST72324LK6 in LQFP32 has different pin count and layout). Functionally compatible parts like ST72324LJ4 (8 KB Flash) or ST72324LK2 (16 KB Flash/ROM) maintain identical peripheral mapping and I/O assignment within the LQFP44 footprint, enabling seamless memory-scaling upgrades.