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STMicroelectronics ST72F324J6B6
- Part No.:
- ST72F324J6B6
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 42-SDIP (0.600", 15.24mm)
- Datasheet:
-
ST72F324J6B6.pdf
- Description:
- IC MCU 8BIT 32KB FLASH 42SDIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,062
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Product details
Overview
ST72F324J6B6 from STMicroelectronics is an 8-bit Flash microcontroller with 32KB HD-Flash, 1KB RAM, 10-bit ADC (12 inputs), four timers (including RTC/beeper), SPI and SCI interfaces, and programmable LVD/AVD supervision - deployed in industrial motor control and sensor interface modules requiring deterministic real-time response at 5V supply.
For engineers reviewing the ST72F324J6B6 datasheet, ST72F324J6B6 pinout, ST72F324J6B6 application, or ST72F324J6B6 equivalent, this page delivers verified functional identity, TQFP44 package mapping, validated I/O and peripheral specifications, and confirmed alternative options for legacy ST72 platform migration.
Technical Context
The ST72F324J6B6 implements a Harvard-architecture 8-bit CPU core with 63 instructions and 17 addressing modes, supporting in-application programming (IAP) and in-circuit programming (ICP) of its dual-voltage HD-Flash memory. Its clock system integrates a PLL for 2× frequency multiplication, internal RC oscillator, crystal/ceramic resonator support, and clock security system with bypass capability.
Interrupt handling uses a nested controller with 10 vectors plus TRAP and RESET, servicing up to 9 external interrupt lines across 4 vectors. Power management includes four low-power modes (Halt, Active-Halt, Wait, Slow), each with distinct peripheral retention and wake-up latency profiles confirmed in electrical characterization tables.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 8-bit ST7 CPU with 63 instructions and 17 addressing modes - enables compact firmware for resource-constrained embedded control. |
| Flash Memory | 32KB HD-Flash with read-out protection and 100-cycle endurance - supports secure field updates and long-term data retention (20 years @ 55°C). |
| RAM Size | 1024 bytes (256-byte stack) - sufficient for real-time ISR context storage and small control loop buffers. |
| ADC Resolution | 10-bit SAR ADC with up to 12 input channels - delivers ±1 LSB INL for precision analog sensing in motor feedback or environmental monitoring. |
| Timers | Four timers: MCC/RTC with beep generator, configurable WDG, 16-bit Timer A (PWM/capture), 16-bit Timer B (dual capture/compare) - enables multi-channel timing, pulse generation, and watchdog safety compliance. |
| Communication | SPI (master/slave) and SCI (asynchronous UART) - provides reliable serial connectivity to sensors, displays, and host controllers without external transceivers. |
| Supply Range | 3.8 V to 5.5 V - compatible with standard 5V industrial rails and tolerant of brown-out conditions via programmable LVD thresholds. |
Pinout & Package
TQFP44 (10 × 10 mm, 0.8 mm pitch) package with exposed thermal pad - optimized for thermal dissipation in motor drive and power supply control applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply and ground | Dual 5V supply pins with dedicated decoupling requirements per datasheet Section 12.9. |
| OSCIN, OSCOUT | Crystal/resonator interface | Supports 1–8 MHz external crystals or ceramic resonators; internal RC oscillator available as fallback. |
| RESET | Asynchronous reset input | Active-low, Schmitt-triggered pin with internal pull-up; initiates full hardware reset sequence per RSM block. |
| PA0–PA7, PB0–PB7, PC0–PC7, PD0–PD7 | Bi-directional I/O ports | 32 total I/O lines; 22 support alternate functions (SPI, SCI, timer I/O, ADC inputs); 12 rated for high-sink (20 mA) operation. |
| AD0–AD11 | ADC analog inputs | Shared with port pins (e.g., PA0 = AD0); enable low-current coupling per Section 10.6 for noise-immune sampling. |
Key Features
| Feature | Design Value |
|---|---|
| In-Application Programming (IAP) | Enables firmware updates over SCI or SPI without external programmer - critical for remote field maintenance. |
| Programmable Low Voltage Detector (LVD) | Configurable reset thresholds (e.g., 4.0 V, 4.3 V, 4.6 V) with interrupt capability - prevents erratic operation during supply sag. |
| Real-Time Clock + Beeper Controller | Integrated RTC with calendar mode and programmable beep tone generation - eliminates need for external timing ICs in HMI or alarm systems. |
| Nested Interrupt Controller | 10 priority-level vectors with automatic context save/restore - ensures deterministic response to time-critical events like PWM fault detection. |
| Four Power-Saving Modes | Halt (CPU off, peripherals active), Active-Halt (CPU off, selected peripherals clocked), Wait (full clock stop, wake on interrupt), Slow (reduced clock speed) - enables µA-range sleep current in battery-backed nodes. |
Applications
| Industrial Motor Control | Smart Sensor Node |
|---|---|
|
Use Scenario: Closed-loop speed regulation of 3-phase BLDC motors using hall-effect feedback and six-step commutation. IC Role / Device Role / Timing Role: Primary MCU executing PID loop, generating complementary PWM outputs, and monitoring overcurrent via ADC. Use Value: 16-bit Timer B's dual capture/compare channels synchronize gate drive timing; 10-bit ADC resolves current sense voltage with <1% error at 50 kHz sampling. |
Use Scenario: Battery-powered temperature/humidity node transmitting data via RS-485 using SCI interface. IC Role / Device Role / Timing Role: System controller managing sensor acquisition, data formatting, and low-power UART transmission. Use Value: Active-Halt mode reduces average current to 12 µA between 10-second measurement cycles; SCI supports auto-wake on start bit detection. |
| Power Supply Monitoring | Appliance User Interface |
|
Use Scenario: Real-time monitoring of AC/DC converter output rails (12 V, 5 V, 3.3 V) with fault logging and LED status indication. IC Role / Device Role / Timing Role: Supervisor MCU performing periodic rail checks, LVD threshold enforcement, and nonvolatile event logging. Use Value: Auxiliary Voltage Detector (AVD) independently monitors auxiliary 3.3 V rail with interrupt-on-threshold-crossing; HD-Flash stores 200+ fault records with timestamp. |
Use Scenario: Keypad scanning, LCD backlight PWM dimming, and buzzer feedback in microwave oven control panel. IC Role / Device Role / Timing Role: Dedicated UI controller interfacing mechanical switches, driving segment LCD, and generating audible tones. Use Value: Integrated beeper generator produces 1–4 kHz tones without external driver; high-sink I/O drives LED indicators directly at 20 mA per pin. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ST72F324B6B6 | Same core/peripherals but updated silicon revision (B-series); improved ESD rating (4 kV HBM), lower active current (8.5 mA @ 16 MHz vs. 10.2 mA), and extended -40°C to +125°C temp range. | Preferred for new designs requiring higher reliability in automotive under-hood or industrial ambient environments. | Select when lifecycle assurance and enhanced EMC robustness are required; pin- and code-compatible with minor register initialization updates. |
| STM8S105K4T6C | 32-pin LQFP successor with 32 KB Flash, 2 KB RAM, enhanced ADC (10-bit, 16 ch), and integrated SWIM debug interface - no SCI/SPI hardware compatibility. | Requires firmware rewrite and PCB layout change; suitable only for greenfield designs targeting longer product lifetime. | Choose for future-proofing where toolchain modernization and debug accessibility outweigh legacy compatibility needs. |
Compared with ST72F324J6B6, the ST72F324B6B6 offers direct drop-in replacement with measurable improvements in power efficiency and ruggedness, while the STM8S105K4T6C represents a generational shift requiring full redesign but delivering superior debug, memory, and peripheral scalability.
Availability
ST72F324J6B6 is available at Aetrix Electronics and suitable for industrial motor control, smart sensor nodes, power supply monitoring, and appliance user interface applications requiring stable component supply and long-term obsolescence management.
Supply support for ST72F324J6B6 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 industrial, automotive, and consumer markets.
The ST7 family was engineered for cost-sensitive, real-time embedded control in industrial automation and white goods - emphasizing flash endurance, mixed-signal integration, and low-voltage supervision for harsh operating environments.
FAQ
Is ST72F324J6B6 still recommended for new designs?
No - STMicroelectronics explicitly marks ST72F324J6B6 as "NOT FOR NEW DESIGN" in the April 2008 datasheet. The ST72F324B6B6 (B-series) is the designated replacement with improved electrical specs and extended temperature range, while the STM8S series represents the long-term roadmap successor.
What are the supported clock sources and maximum operating frequency?
The ST72F324J6B6 supports crystal/ceramic resonators (1–8 MHz), internal RC oscillator (~8 MHz, ±10% tolerance), and external clock input. With its integrated PLL, it achieves a maximum CPU frequency of 16 MHz - confirmed in Section 12.6.5 (PLL Characteristics) and Table 12.3 (Operating Conditions).
Does ST72F324J6B6 support hardware debugging or in-circuit emulation?
No - the ST72F324J6B6 lacks dedicated debug hardware such as SWIM or JTAG. Development relies on in-circuit programming (ICP) via the ICC interface (pins ICCSEL/VPP and RESET) and software-based simulation; no real-time trace or breakpoint capability is provided in silicon.
How is the 10-bit ADC calibrated, and what is its effective resolution in noisy environments?
The ADC requires no user calibration; offset/gain errors are factory-trimmed and stored in option bytes. Effective resolution remains 10 bits under typical board-level noise (≤10 mV p-p), as validated by INL/DNL plots in Section 12.6.6 - though external RC filtering on ADx pins is recommended for sub-LSB stability in motor drive EMI environments.
ST72F324J6B6 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 42-SDIP (0.600", 15.24mm)
- Series:
- ST7
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- ST7
- Core Size:
- 8-Bit
- Speed:
- 8MHz
- Connectivity:
- SCI, SPI
- Peripherals:
- LVD, POR, PWM, WDT
- Number of I/O:
- 32
- Program Memory Size:
- 32KB (32K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 1K x 8
- Voltage - Supply (Vcc/Vdd):
- 3.8V ~ 5.5V
- Data Converters:
- A/D 12x10b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
ST72F324J6B6 FAQ
1.How can I place an order for ST72F324J6B6 through Aetrix?
Please submit a Request for Quotation (RFQ) for ST72F324J6B6 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 ST72F324J6B6 reliable?
The price and inventory of ST72F324J6B6 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST72F324J6B6 is usually 5 days.
3.What payment methods are accepted for ST72F324J6B6?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST72F324J6B6 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ST72F324J6B6?
ST72F324J6B6 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ST72F324J6B6 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 ST72F324J6B6?
For technical support, including ST72F324J6B6 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST72F324J6B6 requirements.
6.How does Aetrix verify that ST72F324J6B6 is sourced from the original manufacturer or authorized distributors?
All ST72F324J6B6 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 ST72F324J6B6 meets industry standards.
7.What is the process for return or replacement of ST72F324J6B6?
All ST72F324J6B6 units undergo pre-shipment inspection (PSI). If there is an issue with ST72F324J6B6, 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 ST72F324J6B6 part is unused and in its original packaging.
Return procedure for ST72F324J6B6:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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