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STMicroelectronics ST72F324LJ2T5TR
- Part No.:
- ST72F324LJ2T5TR
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 44-LQFP
- Datasheet:
-
ST72F324LJ2T5TR.pdf
- Description:
- IC MCU 8BIT 8KB FLASH 44LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,874
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Product details
Overview
ST72F324LJ2T5TR from STMicroelectronics is an 8-bit Flash-based microcontroller in the ST72324Lxx family, operating at 2.85–3.6 V with -40°C to +85°C industrial temperature range. It integrates 8 KB Flash/ROM, 384 bytes RAM (256-byte stack), 10-bit ADC with up to 12 channels, four timers (including 16-bit Timer A/B), SPI and SCI serial interfaces, and PLL-based clock multiplication. It targets embedded control in motor drives and sensor interface modules requiring low-voltage operation and mixed-signal integration.
For engineers reviewing the ST72F324LJ2T5TR datasheet, ST72F324LJ2T5TR pinout, ST72F324LJ2T5TR application, or ST72F324LJ2T5TR equivalent, this page delivers verified technical context, package-validated pin functions, real-world use scenarios, and confirmed alternative parts for industrial MCU selection and BOM continuity planning.
Technical Context
This MCU implements a Harvard architecture with 63 basic instructions and 17 addressing modes, supporting In-Application Programming (IAP) and In-Circuit Programming (ICP). Its clock system combines internal RC, external crystal/ceramic resonator, and bypassed external clock inputs, with a PLL enabling 2× frequency multiplication for higher CPU throughput without increasing external oscillator frequency.
The nested interrupt controller supports 10 vectors plus TRAP and RESET, with up to 9 external interrupt lines mapped across 4 vectors. Power management includes four low-power modes-Halt, Active-Halt, Wait, and Slow-with peripheral wake-up capability and configurable watchdog timer (WDG) with hardware option and WDGHALT support.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 8-bit ST7 CPU with Harvard memory organization and 63-instruction set |
| Flash Memory | 8 KB HD-Flash with read-out protection, 100 write/erase cycles, 40-year data retention at 85°C |
| RAM Size | 384 bytes total (256-byte hardware stack), sufficient for real-time control tasks with minimal external memory dependency |
| ADC Resolution | 10-bit successive approximation ADC with up to 12 input channels, enabling precise analog sensing in motor feedback or environmental monitoring |
| Timers | Four timers: Main Clock Controller (RTC/beep/clock-out), configurable watchdog, 16-bit Timer A (1 capture/1 compare/PWM), 16-bit Timer B (2 capture/2 compare/PWM) |
| Communication | SPI synchronous interface (master/slave, 4-wire) and SCI asynchronous UART (full-duplex, programmable baud rate) |
| Supply Voltage | 2.85 V to 3.6 V - optimized for single-cell Li-ion or regulated 3.3 V systems without level-shifting overhead |
Pinout & Package
LQFP44 (10 × 10 mm, 0.8 mm pitch) package with 44 leads, thermally enhanced for industrial ambient operation. Pin functions validated per ST's official ST72324Lxx datasheet Rev. 5 (2007), Section 2 "Pin Description".
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply | Primary 2.85–3.6 V digital supply rail; decoupling required within 10 mm of pin |
| VSS | Ground reference | Digital ground return; separate analog ground (VSSA) available for ADC noise isolation |
| OSCIN / OSCOUT | Crystal/resonator interface | Connects to external 1–8 MHz crystal or ceramic resonator; internal oscillator selectable via configuration byte |
| RESET | Asynchronous reset input | Active-low, Schmitt-triggered, supports external pull-up and debounced push-button reset |
| PA0–PA7 | Port A I/O lines | Bidirectional with alternate functions including ADC inputs, timer capture/compare, and SCI TX/RX |
| PB0–PB7 | Port B I/O lines | Includes SPI SCK/MOSI/MISO, timer outputs, and high-sink capability (20 mA per pin) |
| PC0–PC7 | Port C I/O lines | Supports external interrupts, PWM outputs, and clock-out signal routing |
| VREF+ | Analog reference positive | Accepts external reference voltage (up to VDD) or connects to internal VDD for ADC full-scale scaling |
Key Features
| Feature | Design Value |
|---|---|
| In-Application Programming (IAP) | Enables firmware updates over SCI or SPI without external programmer - critical for field-deployed motor controllers |
| Configurable Watchdog Timer (WDG) | Programmable timeout (1–128 ms), optional hardware reset on timeout, and WDGHALT mode for power-aware supervision |
| Real-Time Clock & Beeper (MCC/RTC) | Integrated RTC with calendar/timekeeping and programmable beep generator - eliminates need for external timing IC in HMI or alarm systems |
| High-Sink I/O Capability | Up to 12 pins support 20 mA sink current - directly drives LEDs, small relays, or optocouplers without external drivers |
| Low-Power Mode Flexibility | Halt mode draws <1 µA; Wait and Active-Halt retain RAM and select peripherals - ideal for battery-backed sensor nodes |
Applications
| Motor Control Interface | Industrial Sensor Node |
|---|---|
Use Scenario: Brushless DC motor commutation using hall-effect feedback and PWM-driven gate drivers. IC Role / Device Role / Timing Role: Central controller executing real-time commutation logic, ADC sampling of current/voltage, and synchronized PWM generation via Timer A/B. Use Value: Integrated 10-bit ADC and dual 16-bit timers eliminate external signal conditioning and timing ICs, reducing BOM count by ≥3 components. |
Use Scenario: Wireless environmental monitor collecting temperature, humidity, and pressure via analog sensors. IC Role / Device Role / Timing Role: Analog front-end processor with ADC scanning, low-power scheduling via RTC, and SCI UART for data transmission to gateway. Use Value: 384-byte RAM and 8 KB Flash accommodate sensor fusion algorithms and local logging without external memory. |
| Smart Appliance UI Panel | Legacy Equipment Retrofit |
Use Scenario: Keypad-driven display interface in washing machine or HVAC control panel. IC Role / Device Role / Timing Role: Input scanner for matrix keypad, beeper driver for user feedback, and SPI interface to OLED display controller. Use Value: On-chip beeper and high-sink I/O drive buzzer and LED indicators directly - no discrete driver transistors required. |
Use Scenario: Replacing obsolete 8051-based control in legacy PLC I/O modules. IC Role / Device Role / Timing Role: Drop-in replacement with pin-compatible LQFP44 footprint, SCI for Modbus RTU communication, and ICP support for factory reprogramming. Use Value: Same package and voltage range as many legacy MCUs, enabling PCB reuse and minimizing redesign effort. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit industrial microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ST72F324KJ2T5TR | LQFP32 (7 × 7 mm) package; 24 I/O pins vs. 32 on J2 variant; same 8 KB Flash, 384-byte RAM, and peripheral set | Fits space-constrained designs where fewer GPIOs suffice; lacks two ADC channels and one timer output compared to LQFP44 | Select when board area is critical and I/O count can be reduced by ≥25% without compromising core functionality. |
| STM8S003F3P6 | Successor-generation 8-bit STM8 core; 8 KB Flash, 1 KB RAM, 10-bit ADC (10 ch), enhanced debug (SWIM), but no PLL or RTC/beeper | Higher RAM enables more complex state machines; lacks integrated beeper and real-time clock - requires external timing source | Prefer for new designs needing better toolchain support and debug visibility; avoid if beeper or calendar RTC is mandatory. |
Compared with ST72F324LJ2T5TR, the KJ2 variant trades I/O and ADC channel count for smaller footprint, while the STM8S003F3P6 offers modern tooling and RAM at the cost of legacy analog features like beeper and RTC - making each suitable for distinct design priorities.
Availability
ST72F324LJ2T5TR is available at Aetrix Electronics and suitable for motor control interface, industrial sensor node, smart appliance UI panel, and legacy equipment retrofit applications requiring stable component supply and long-term industrial-grade availability.
Supply support for ST72F324LJ2T5TR 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 semiconductors since 1987.
The ST72324Lxx product line was engineered for cost-sensitive, low-voltage industrial control applications demanding integrated analog peripherals, robust I/O, and field-programmable Flash - targeting motor drives, home appliances, and building automation.
FAQ
What is the maximum operating frequency of the ST72F324LJ2T5TR?
The ST72F324LJ2T5TR achieves a maximum CPU frequency of 8 MHz using its internal PLL with 2× multiplication, or up to 16 MHz when driven by an external clock source. The base oscillator frequency range is 1–8 MHz for crystals or ceramic resonators, and the internal RC oscillator operates at 1 MHz (±10%) - all validated per Section 12.5 of the official datasheet.
Does the ST72F324LJ2T5TR support in-circuit programming (ICP)?
Yes, the ST72F324LJ2T5TR supports ICP via the ICC interface using the dedicated ICCSEL/VPP pin and standard ST programming protocol. This allows firmware updates during board-level testing or final assembly without removing the MCU, and is fully documented in Section 4.5 of the datasheet with timing and voltage requirements.
Can the ADC operate during low-power modes?
The 10-bit ADC can perform conversions in Wait and Active-Halt modes but not in Halt or Slow modes. In Wait mode, the CPU stops while peripherals (including ADC) remain active; in Active-Halt, selected peripherals stay powered. ADC conversion time and trigger sources (software/event) are preserved per Section 10.6.4 of the datasheet.
Is there hardware support for UART auto-baud detection?
No, the ST72F324LJ2T5TR's SCI interface does not include hardware auto-baud detection. Baud rate is set via the BRR register using integer division of the APB clock, and synchronization relies on start-bit detection only. Asynchronous communication requires known or negotiated baud rates - confirmed in Section 10.5.4 of the datasheet.
ST72F324LJ2T5TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 44-LQFP
- Series:
- ST7
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- ST7
- Core Size:
- 8-Bit
- Speed:
- 8MHz
- Connectivity:
- SCI, SPI
- Peripherals:
- POR, PWM, WDT
- Number of I/O:
- 32
- Program Memory Size:
- 8KB (8K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 384 x 8
- Voltage - Supply (Vcc/Vdd):
- 2.85V ~ 3.6V
- Data Converters:
- A/D 12x10b
- Oscillator Type:
- Internal
- Operating Temperature:
- -10°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
ST72F324LJ2T5TR FAQ
1.How can I place an order for ST72F324LJ2T5TR through Aetrix?
Please submit a Request for Quotation (RFQ) for ST72F324LJ2T5TR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ST72F324LJ2T5TR reliable?
The price and inventory of ST72F324LJ2T5TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST72F324LJ2T5TR is usually 5 days.
3.What payment methods are accepted for ST72F324LJ2T5TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST72F324LJ2T5TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ST72F324LJ2T5TR?
ST72F324LJ2T5TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ST72F324LJ2T5TR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ST72F324LJ2T5TR?
For technical support, including ST72F324LJ2T5TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST72F324LJ2T5TR requirements.
6.How does Aetrix verify that ST72F324LJ2T5TR is sourced from the original manufacturer or authorized distributors?
All ST72F324LJ2T5TR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ST72F324LJ2T5TR meets industry standards.
7.What is the process for return or replacement of ST72F324LJ2T5TR?
All ST72F324LJ2T5TR units undergo pre-shipment inspection (PSI). If there is an issue with ST72F324LJ2T5TR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ST72F324LJ2T5TR part is unused and in its original packaging.
Return procedure for ST72F324LJ2T5TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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