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STMicroelectronics ST72F324J2T6
- Part No.:
- ST72F324J2T6
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 44-LQFP
- Datasheet:
-
ST72F324J2T6.pdf
- Description:
- IC MCU 8BIT 8KB FLASH 44LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,171
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Product details
Overview
ST72F324J2T6 from STMicroelectronics is an 8-bit Flash microcontroller with 8 KB program memory, 384 bytes RAM, 10-bit ADC (12-channel), dual 16-bit timers (Timer A and Timer B), SPI/SCI serial interfaces, and PLL-based clock multiplication - deployed in industrial motor control and sensor interface modules requiring deterministic real-time response under 5.5 V supply.
For engineers reviewing the ST72F324J2T6 datasheet, ST72F324J2T6 pinout, ST72F324J2T6 application, or ST72F324J2T6 equivalent, key selection considerations include its 8 KB HD-Flash endurance (100 write cycles), programmable LVD reset thresholds, 4 power-saving modes (Halt/Wait/Slow/Active-Halt), 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 Main Clock Controller (MCC) with real-time base, beep generator, and clock-out capability; configurable watchdog timer with hardware option; and low-current-coupled 10-bit ADC with robust input protection - all operating within −40°C to +125°C ambient range at 3.8–5.5 V.
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 | 8 KB HD-Flash with read-out protection and 100-cycle endurance - supports field firmware updates via IAP/ICP without external programmer. |
| RAM Size | 384 bytes (including 256-byte stack) - sufficient for real-time ISR handling and small state-machine 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 temperature monitoring. |
| Timers | Dual 16-bit timers: Timer A (1 capture/1 compare/PWM) and Timer B (2 capture/2 compare/PWM) - enables synchronized PWM generation and encoder pulse counting. |
| Communication | SPI (master/slave) and SCI (asynchronous UART) - provides reliable host communication and daisy-chain peripheral control. |
| Supply Range | 3.8 V to 5.5 V - compatible with standard 5 V industrial rails and tolerant of brown-out conditions via programmable LVD. |
| Operating Temp | −40°C to +125°C - qualified for under-hood automotive sensors and industrial PLC I/O modules. |
Pinout & Package
TQFP32 (7 × 7 mm, 0.8 mm pitch) package with 24 multifunctional bidirectional I/O lines, 10 alternate function lines, and 12 high-sink outputs (20 mA per pin).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply and ground | Separate analog/digital supply pins enable noise isolation for ADC operation. |
| PA0–PA7 | Port A I/O | 8-bit bidirectional port with interrupt-on-change capability - used for keypad scanning or digital input monitoring. |
| PB0–PB7 | Port B I/O | 8-bit port supporting SPI (PB4–PB6) and SCI (PB1–PB2) alternate functions - simplifies board routing for serial comms. |
| PC0–PC7 | Port C I/O | 8-bit port with Timer A/B inputs/outputs and ADC channel mapping - enables direct connection to motor gate drivers or sensor signals. |
| RESET | Asynchronous reset input | Active-low, Schmitt-triggered pin with internal pull-up - ensures reliable cold-start and brown-out recovery. |
| OSCIN/OSCOUT | Crystal oscillator interface | Supports 1–8 MHz crystal or ceramic resonator - provides stable timing reference for real-time control loops. |
| ICCSEL/VPP | In-circuit programming control | Enables HD-Flash programming via ICC interface without HV supply - reduces production test complexity. |
Key Features
| Feature | Design Value |
|---|---|
| In-Application Programming (IAP) | Allows firmware updates during runtime using internal bootloader - eliminates need for external debugger in field-deployed units. |
| Programmable Low-Voltage Detector (LVD) | Configurable reset threshold (e.g., 4.0 V or 4.5 V) with interrupt capability - prevents erratic operation during supply sag in battery-backed systems. |
| Four Power-Saving Modes | Halt (0.3 µA), Active-Halt (1.5 µA), Wait (12 µA), Slow (80 µA) - extends battery life in wireless sensor nodes while retaining RAM and register state. |
| Nested Interrupt Controller | 10 priority-level vectors with automatic context save - guarantees sub-2 µs latency for time-critical events like overcurrent fault detection. |
| Real-Time Clock & Beeper | MCC module provides calendar-timekeeping and audible alert generation without external components - reduces BOM count in HMI applications. |
Applications
| Industrial Motor Control | Automotive Sensor Interface |
|---|---|
Use Scenario: Brushless DC motor commutation in HVAC blowers and pump drives. IC Role / Device Role / Timing Role: Real-time PWM generation, Hall-effect sensor decoding, and current-sense ADC sampling at 10 kHz. Use Value: Dual 16-bit timers synchronize three-phase gate drive with <1 µs jitter; 10-bit ADC resolves 12-bit effective resolution via oversampling. |
Use Scenario: Tire pressure monitoring system (TPMS) front-end with piezoresistive sensor. IC Role / Device Role / Timing Role: Low-power wake-on-event controller with ADC-based pressure acquisition and SPI transmission to RF transceiver. Use Value: Active-Halt mode draws 1.5 µA while preserving ADC calibration registers; programmable AVD triggers wake on battery voltage drop. |
| Smart Energy Metering | Factory Automation I/O Module |
Use Scenario: Residential electricity meter with tamper detection and pulse output. IC Role / Device Role / Timing Role: Isolated current/voltage sampling interface with real-time energy accumulation and LCD driver support. Use Value: MCC RTC maintains accurate billing time across power interruptions; 8 KB Flash stores tariff tables and firmware update images. |
Use Scenario: DIN-rail mounted digital I/O expansion unit for PLC systems. IC Role / Device Role / Timing Role: Isolated input debouncing, output latching, and Modbus RTU communication via SCI. Use Value: 24 I/O lines with 20 mA sink capability drive LEDs and relays directly; SPI supports daisy-chained configuration EEPROMs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ST72F324J4T6 | 16 KB Flash, 512 bytes RAM - doubles code space and stack depth. | Required for larger protocol stacks (e.g., full Modbus TCP offload) or multi-sensor fusion algorithms. | Select when firmware size exceeds 8 KB or additional RAM is needed for buffering serial data streams. |
| STM8S003F3P6 | Enhanced ST8 core, 8 KB Flash, 1 KB RAM, integrated EEPROM, higher clock speed (16 MHz). | Offers superior interrupt latency and built-in EEPROM for parameter storage - better suited for safety-critical resets. | Prefer for new designs needing longer data retention, faster execution, or reduced external component count. |
Compared with ST72F324J4T6 and STM8S003F3P6, the ST72F324J2T6 trades flash capacity and modern peripherals for proven reliability in cost-sensitive, volume-manufactured industrial controls where legacy toolchain support is mandatory.
Availability
ST72F324J2T6 is available at Aetrix Electronics and suitable for industrial motor control, automotive sensor interface, and smart energy metering requiring stable component supply and long-term lifecycle assurance.
Supply support for ST72F324J2T6 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 microcontrollers, power management, and automotive ICs.
The ST72324Jx series was designed for cost-optimized, high-reliability 8-bit control in harsh environments - targeting industrial automation, appliance control, and automotive body electronics before ST's transition to STM8.
FAQ
Is ST72F324J2T6 still recommended for new designs?
No - STMicroelectronics marks this device as "Not for New Design" per the April 2008 datasheet. It remains supported for existing production and obsolescence management, but new projects should use the pin-compatible STM8S003F3P6 or ST72324B variants with updated toolchains and extended longevity.
What programming interfaces does ST72F324J2T6 support?
It supports In-Circuit Programming (ICP) via the ICC interface using the STVP software and standard SWIM connector, plus In-Application Programming (IAP) through user firmware. No JTAG or SWD is available - debugging requires ST's proprietary ST7-DEBUG adapter.
Does ST72F324J2T6 include hardware EEPROM?
No - it lacks dedicated EEPROM. Data retention relies on emulating EEPROM in HD-Flash using wear-leveling firmware, limited by 100 write cycles. For frequent parameter writes, external serial EEPROM or the STM8S003F3P6 (with true 128-byte EEPROM) is preferred.
Can ST72F324J2T6 operate at 3.3 V?
No - its absolute minimum supply voltage is 3.8 V per datasheet Section 12.3. Operation below this risks incorrect Flash read/write behavior and ADC nonlinearity. For 3.3 V systems, level-shifting or migration to STM8L-series ultra-low-power MCUs is required.
ST72F324J2T6 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 44-LQFP
- Series:
- ST7
- Packaging:
- Tray
- 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:
ST72F324J2T6 FAQ
1.How can I place an order for ST72F324J2T6 through Aetrix?
Please submit a Request for Quotation (RFQ) for ST72F324J2T6 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 ST72F324J2T6 reliable?
The price and inventory of ST72F324J2T6 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST72F324J2T6 is usually 5 days.
3.What payment methods are accepted for ST72F324J2T6?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST72F324J2T6 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ST72F324J2T6?
ST72F324J2T6 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ST72F324J2T6 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 ST72F324J2T6?
For technical support, including ST72F324J2T6 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST72F324J2T6 requirements.
6.How does Aetrix verify that ST72F324J2T6 is sourced from the original manufacturer or authorized distributors?
All ST72F324J2T6 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 ST72F324J2T6 meets industry standards.
7.What is the process for return or replacement of ST72F324J2T6?
All ST72F324J2T6 units undergo pre-shipment inspection (PSI). If there is an issue with ST72F324J2T6, 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 ST72F324J2T6 part is unused and in its original packaging.
Return procedure for ST72F324J2T6:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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