STMicroelectronics ST72F324BJ6T6TR

Overview

ST72F324BJ6T6TR from STMicroelectronics is an automotive-grade 8-bit MCU featuring 32 Kbyte HDFlash, 1024-byte RAM, 10-bit ADC with 12 input channels, dual 16-bit timers (Timer A and Timer B), SPI/SCI interfaces, and PLL-based clock multiplication - deployed in engine control units and body electronics requiring extended temperature operation (-40°C to +125°C).

For engineers reviewing the ST72F324BJ6T6TR datasheet, ST72F324BJ6T6TR pinout, ST72F324BJ6T6TR application, or ST72F324BJ6T6TR equivalent, key selection criteria include automotive AEC-Q100 qualification, LQFP44 package compatibility, 3.8–5.5 V supply range, nested interrupt support (10 vectors), and in-application programming (IAP) capability for field firmware updates.

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 crystal/ceramic resonator oscillators, internal RC oscillator, external clock input, and a 2× PLL for CPU frequency scaling.

The interrupt subsystem features nested priority management across 10 vectors plus TRAP and RESET, with up to 9 external interrupt lines mapped on 4 vectors. Power management includes four low-power modes (Slow, Wait, Active Halt, Halt), supported by enhanced LVD with programmable thresholds and AVD with interrupt capability.

Key Specifications

Pinout & Package

LQFP44 (10 × 10 mm, 0.8 mm pitch) package with exposed thermal pad; 44-pin quad flat pack optimized for automotive PCB layouts requiring mechanical robustness and thermal dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ST72F324BJ6T6TR, the BK6T6TR saves PCB area but sacrifices I/O flexibility, while the STM8AF5269TAY upgrades communication capability at the cost of architectural discontinuity and higher BOM cost.

Availability

ST72F324BJ6T6TR is available at Aetrix Electronics and suitable for engine control units, body control modules, instrument clusters, and HVAC systems requiring stable component supply across automotive production lifecycles.

Supply support for ST72F324BJ6T6TR 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-sensitive, high-reliability automotive applications demanding extended temperature operation, robust EMC performance, and long-term supply stability - with ST72F324B targeting mid-tier ECU and BCM implementations.

FAQ

Is ST72F324BJ6T6TR AEC-Q100 qualified?

Yes, ST72F324BJ6T6TR is qualified to AEC-Q100 Grade 2 (−40°C to +125°C ambient), with test reports covering HTOL, TC, ESD, and EMC per automotive standards. The qualification applies specifically to the LQFP44 package variant and is documented in ST's official automotive product release files.

Does this MCU support in-circuit programming (ICP)?

Yes, ST72F324BJ6T6TR supports ICP via the ICC interface using the dedicated ICCSEL/VPP pin. It requires a 13.5 V programming voltage and is compatible with ST's STVP and third-party tools like Raisonance Ride, enabling factory programming without removing the device from the PCB.

What is the maximum ADC sampling rate?

The 10-bit ADC achieves a maximum conversion rate of 100 kSPS under typical conditions (VDD = 5 V, fCPU = 8 MHz). Conversion time is 13 µs per sample, and the module supports both single-shot and continuous scan modes with configurable acquisition time per channel.

Can the PLL be disabled to run from internal RC oscillator only?

Yes, the PLL can be disabled via the PLLCR register, allowing the MCU to operate directly from the internal RC oscillator (8 MHz nominal, ±10% tolerance). This configuration reduces power consumption and eliminates external crystal components, suitable for non-timing-critical subsystems.