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STMicroelectronics ST72F324J2T6TR
- Part No.:
- ST72F324J2T6TR
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 44-LQFP
- Datasheet:
-
ST72F324J2T6TR.pdf
- Description:
- IC MCU 8BIT 8KB FLASH 44LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,498
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Product details
Overview
ST72F324J2T6TR from STMicroelectronics is an 8-bit microcontroller featuring 8KB Flash memory, 384 bytes RAM, 10-bit ADC with up to 12 input channels, dual 16-bit timers (Timer A and Timer B), SPI and SCI serial interfaces, and four power-saving modes. It operates across 3.8V–5.5V and supports industrial temperature range (−40°C to +125°C), targeting embedded control in motor drives and sensor interface modules.
For engineers reviewing the ST72F324J2T6TR datasheet, ST72F324J2T6TR pinout, ST72F324J2T6TR application, or ST72F324J2T6TR equivalent, key selection considerations include Flash endurance (100 write/erase cycles), real-time clock/beeper capability in the Main Clock Controller, programmable LVD/AVD voltage detection, and TQFP32 (7 × 7 mm) package compatibility with legacy ST72324Jx designs.
Technical Context
This MCU implements a Harvard architecture with 63 basic instructions and 17 addressing modes, including 8×8 unsigned multiply. Its nested interrupt controller supports 10 vectors plus TRAP and RESET, with up to 9 external interrupt lines mapped across 4 vectors.
The on-chip peripherals include a configurable watchdog timer, PLL for 2× frequency multiplication, and low-current-coupled analog subsystem. Clock sources comprise crystal/ceramic resonator oscillators, internal RC oscillator, and external clock bypass - all managed by the Multi-Oscillator (MO) block and Reset Sequence Manager (RSM).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 8-bit ST7 CPU with Harvard bus, 63 instructions, 17 addressing modes |
| Flash Memory | 8 KB HD-Flash with read-out protection, 100-cycle endurance, 20-year data retention at 55°C |
| RAM Size | 384 bytes (including 256-byte stack), volatile storage for variables and context |
| ADC Resolution | 10-bit successive approximation ADC with up to 12 robust input ports |
| Timers | Dual 16-bit timers: Timer A (1 capture/1 compare/PWM), Timer B (2 capture/2 compare/PWM) |
| Communication | SPI synchronous interface + SCI asynchronous UART-compatible interface |
| Supply Range | 3.8 V to 5.5 V - supports direct connection to 5 V logic rails and industrial power domains |
| Temperature Range | −40°C to +125°C - qualified for under-hood automotive and industrial motor control environments |
Pinout & Package
TQFP32 (7 × 7 mm, 0.8 mm pitch) package with 32-pin layout optimized for compact industrial control PCBs. Pin functions validated per ST's official "ST72324Jx" datasheet Rev. 5 (April 2008), Section 2 "Pin Description".
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply | Main 3.8–5.5 V supply rail; decoupling required near pin for noise immunity |
| VSS | GND reference | Digital ground return path; must be low-impedance and separated from analog ground if used |
| RESET | Asynchronous reset input | Active-low signal; initiates hardware reset sequence via Reset Sequence Manager (RSM) |
| OSCIN / OSCOUT | Crystal/resonator interface | Connects to external 1–8 MHz crystal or ceramic resonator; internal oscillator circuitry enabled |
| PA0–PA7 | Port A I/O lines | Bidirectional with alternate functions including SCI TX/RX, SPI signals, and timer inputs/outputs |
| PD0–PD7 | Port D I/O lines | Includes high-sink capability (20 mA per pin); usable for LED driving or relay control without external drivers |
Key Features
| Feature | Design Value |
|---|---|
| In-Application Programming (IAP) | Enables firmware updates over SCI or SPI without external programmer - critical for field-deployed devices |
| Enhanced Low Voltage Detector (LVD) | Programmable reset thresholds with interrupt capability - allows graceful shutdown before brownout |
| Main Clock Controller (MCC) | Integrates real-time base, beep generator, and clock-out function - eliminates need for external RTC or tone generator ICs |
| Four Power Saving Modes | Halt, Active-Halt, Wait, and Slow modes reduce current to ≤1.5 µA (Halt) - extends battery life in intermittent-sensing applications |
| High Sink I/O Capability | 10 pins support 20 mA sink current - directly drives LEDs, small solenoids, or optocouplers without buffer transistors |
Applications
| Motor Control Interface | Sensor Data Acquisition |
|---|---|
|
Use Scenario: Brushless DC motor commutation in HVAC blowers using Hall-effect feedback. IC Role / Device Role / Timing Role: Real-time PWM generation via Timer B, ADC sampling of current sense resistors, and SCI-based host command parsing. 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: Industrial temperature monitoring node with thermistor and RTD inputs. IC Role / Device Role / Timing Role: 12-channel ADC scanning with programmable gain, LVD-triggered alert interrupt, and SPI communication to master controller. Use Value: Programmable AVD threshold enables adaptive alarm triggering based on supply droop during sensor excitation pulses. |
| Legacy Automotive Body Control | Smart Appliance Subsystem |
|
Use Scenario: Door lock actuator sequencing and window lift anti-pinch logic in pre-2010 vehicle platforms. IC Role / Device Role / Timing Role: High-sink I/O driving relays and solenoids; watchdog supervision ensures fail-safe timeout during CAN message loss. Use Value: 20 mA sink per PD pin allows direct drive of 12 V automotive coils rated ≤250 mW - avoids discrete driver stage. |
Use Scenario: Washing machine drum speed control and water level sensing subsystem. IC Role / Device Role / Timing Role: SCI interface to main MCU, Timer A for precise motor phase timing, and MCC-generated beep feedback for user alerts. Use Value: Integrated beep generator replaces external piezo driver circuit, saving PCB area and component cost in cost-sensitive white goods. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ST72F324K2T6TR | 16 KB Flash, 512 bytes RAM, same peripheral set and pinout | Supports larger firmware images and deeper state machines; identical TQFP32 footprint | Select when firmware exceeds 8 KB or requires extended data buffering |
| ST72F324B2T6TR | Newer revision with enhanced ESD rating (±4 kV HBM), updated Flash programming algorithm | Qualified for new designs per ST's "not for new design" notice; improved reliability in noisy environments | Prefer for production starts after 2008; verify bootloader compatibility before migration |
Compared with ST72F324J2T6TR, the K2 variant offers scalable memory headroom while maintaining full software and hardware compatibility, whereas the B2 variant delivers lifecycle-supported reliability upgrades but requires validation of in-field firmware update paths.
Availability
ST72F324J2T6TR is available at Aetrix Electronics and suitable for motor control interface, sensor data acquisition, legacy automotive body control, and smart appliance subsystems requiring stable component supply and long-term industrial availability.
Supply support for ST72F324J2T6TR 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-grade components since 1987.
The ST72324Jx series belongs to ST's legacy 8-bit ST7 microcontroller family, engineered specifically for cost-sensitive, resource-constrained industrial and automotive body electronics where Flash programmability, analog integration, and wide temperature operation are essential.
FAQ
Is ST72F324J2T6TR still recommended for new designs?
No - STMicroelectronics explicitly marks this device as "NOT FOR NEW DESIGN" in the April 2008 datasheet. The ST72F324Bx series is the designated replacement, offering improved ESD performance and updated Flash programming algorithms. Legacy design refreshes or repair programs may continue using J2T6TR, but new schematics should target B2 or later revisions.
What is the maximum operating frequency with internal RC oscillator?
The internal RC oscillator delivers 8 MHz ±20% at VDD = 5 V and 25°C, as specified in Section 12.6.4 of the datasheet. Frequency stability degrades with voltage and temperature variation; for timing-critical applications like UART baud generation, use crystal or PLL-multiplied clock sources instead.
Does ST72F324J2T6TR support ISP (In-System Programming)?
Yes - it supports In-Circuit Programming (ICP) via the ICC interface using the dedicated ICCSEL/VPP pin (Pin 32). This enables programming through a two-wire interface without removing the MCU from the board, provided the target system implements the required ICC timing and voltage sequencing per Section 4.5 of the datasheet.
Can the 10-bit ADC operate during Low Power Modes?
Yes - the ADC remains functional in Wait and Active-Halt modes, but not in Halt or Slow modes. Section 10.6.4 confirms that conversion can be triggered by software or timer events in Wait mode, enabling periodic sensor sampling while minimizing active CPU time and current draw.
ST72F324J2T6TR 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:
- LVD, 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):
- 3.8V ~ 5.5V
- Data Converters:
- A/D 12x10b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
ST72F324J2T6TR FAQ
1.How can I place an order for ST72F324J2T6TR through Aetrix?
Please submit a Request for Quotation (RFQ) for ST72F324J2T6TR 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 ST72F324J2T6TR reliable?
The price and inventory of ST72F324J2T6TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST72F324J2T6TR is usually 5 days.
3.What payment methods are accepted for ST72F324J2T6TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST72F324J2T6TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ST72F324J2T6TR?
ST72F324J2T6TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ST72F324J2T6TR 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 ST72F324J2T6TR?
For technical support, including ST72F324J2T6TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST72F324J2T6TR requirements.
6.How does Aetrix verify that ST72F324J2T6TR is sourced from the original manufacturer or authorized distributors?
All ST72F324J2T6TR 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 ST72F324J2T6TR meets industry standards.
7.What is the process for return or replacement of ST72F324J2T6TR?
All ST72F324J2T6TR units undergo pre-shipment inspection (PSI). If there is an issue with ST72F324J2T6TR, 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 ST72F324J2T6TR part is unused and in its original packaging.
Return procedure for ST72F324J2T6TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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