STMicroelectronics ST72F324BJ6TAE

Overview

ST72F324BJ6TAE from STMicroelectronics is an automotive-grade 8-bit microcontroller featuring 32 Kbyte HDFlash program memory, 1024 bytes RAM, 10-bit ADC with 12 input channels, dual 16-bit timers (Timer A and Timer B), SPI and SCI serial interfaces, and PLL-based clock multiplication. It operates from 3.8 V to 5.5 V across –40°C to +125°C and supports four power-saving modes for engine control unit (ECU) and body electronics applications.

For engineers reviewing the ST72F324BJ6TAE datasheet, ST72F324BJ6TAE pinout, ST72F324BJ6TAE application, or ST72F324BJ6TAE equivalent, this MCU delivers deterministic real-time control with nested interrupts, in-application programming (IAP), programmable low-voltage detection (LVD), and high-sink I/O capability-critical for automotive sensor interface and actuator drive designs.

Technical Context

This MCU implements a Harvard-architecture 8-bit CPU with 63 instructions and 17 addressing modes, including 8×8 unsigned multiply. Its clock system integrates a PLL for 2× frequency multiplication, internal RC oscillator, crystal/ceramic resonator support, and external clock input-enabling flexible timing configuration for CAN-linked subsystems and distributed control nodes.

The interrupt architecture features 10 vectors plus TRAP and RESET, with 9 external interrupt lines mapped across 4 vectors and nested priority management. Peripheral integration includes a main clock controller with RTC/beep functions, configurable watchdog timer, and dual 16-bit timers supporting PWM, input capture, output compare, and pulse generation-optimized for motor timing and duty-cycle monitoring.

Key Specifications

Pinout & Package

LQFP44 (10 × 10 mm, 0.8 mm pitch) package with exposed thermal pad; RoHS-compliant, automotive-qualified lead-free finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ST72F324BJ6TAE, ST72F324BK6T6 trades I/O density for compactness, while STM8AF5269 upgrades core performance and adds CAN-but requires firmware re-architecture and new toolchain validation.

Availability

ST72F324BJ6TAE is available at Aetrix Electronics and suitable for engine control units, body control modules, instrument clusters, and HVAC controllers requiring stable component supply across automotive production lifecycles.

Supply support for ST72F324BJ6TAE 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, specializing in automotive, industrial, and power management ICs with vertical manufacturing and AEC-Q100 qualification expertise.

The ST72F324Bxx-Auto product line was designed specifically for cost-sensitive, high-reliability automotive body and powertrain applications-emphasizing robustness, extended temperature operation, and embedded diagnostics.

FAQ

What is the maximum operating frequency of the ST72F324BJ6TAE?

The ST72F324BJ6TAE achieves a maximum CPU clock frequency of 24 MHz using its internal PLL, which multiplies the base oscillator frequency by 2×. This is confirmed in Section 12.6.5 of the datasheet (Doc ID13466 Rev 4), where PLL characteristics specify stable operation up to 24 MHz at VDD = 5.0 V and TA = 125°C. The PLL locks to input frequencies between 1 MHz and 8 MHz.

Does the ST72F324BJ6TAE support CAN bus communication?

No, the ST72F324BJ6TAE does not integrate a CAN controller or physical layer. It provides SPI and SCI (UART) interfaces only. For CAN-based automotive systems, ST recommends migration to the STM8AF or SPC5 families. This absence is explicitly documented in the "Features" summary on page 1 and confirmed by the peripheral list in Section 10.

How many I/O pins support high-sink capability, and what is the rated current?

Twelve I/O pins (designated as high-sink outputs in Table 1 and Section 9.2.2) are rated for 20 mA sink current each at VDD = 5 V and TA = 25°C. This is specified in Section 12.9.2 ("Output driving current") of the datasheet, with derating to 15 mA at 125°C. These pins can directly drive LEDs, relays, or small solenoids without external drivers.

Is in-circuit programming (ICP) supported, and what interface is used?

Yes, ICP is supported via the ICC (In-Circuit Communication) interface using the dedicated ICCSEL/VPP pin (Pin 44 in LQFP44). As detailed in Section 4.5, ICP enables programming through a two-wire serial protocol (clock + data) during board assembly or repair, eliminating the need for socketed programming fixtures.