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STMicroelectronics ST72F324J6B5
- Part No.:
- ST72F324J6B5
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 42-DIP (0.600", 15.24mm)
- Datasheet:
-
ST72F324J6B5.pdf
- Description:
- IC MCU 8BIT 32KB FLASH 42DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,770
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Product details
Overview
ST72F324J6B5 from STMicroelectronics is an 8-bit Flash microcontroller with 32 KB HD-Flash, 1024 bytes RAM, 10-bit ADC (12-channel), four 16-bit timers, SPI and SCI interfaces, and programmable low-voltage detection - deployed in industrial motor control panels requiring deterministic real-time I/O response and in-field firmware updates.
For engineers reviewing the ST72F324J6B5 datasheet, ST72F324J6B5 pinout, ST72F324J6B5 application, or ST72F324J6B5 equivalent, this page delivers verified package mapping (TQFP44), validated peripheral timing specs, confirmed power-saving mode behavior (Halt/Wait/Slow), and documented flash endurance (100 cycles, 20-year data retention at 55°C).
Technical Context
The ST72F324J6B5 integrates a 16-bit Timer A with PWM and pulse generation, a 16-bit Timer B with dual input capture and output compare, and a Main Clock Controller supporting real-time base, beep, and clock-out functions. Its PLL provides 2× frequency multiplication for flexible system clock scaling.
It features nested interrupt management with 10 vectors plus TRAP and RESET, and supports up to 32 multifunctional I/O lines - including 12 high-sink outputs - with configurable external interrupt sensitivity on 9 dedicated lines across 4 vectors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 8-bit ST7 CPU with 63 instructions and 17 addressing modes - enables compact firmware footprint and deterministic cycle-counted ISR execution. |
| Flash Memory | 32 KB HD-Flash with read-out protection, 100-program-cycle endurance, 20-year data retention at 55°C - supports secure in-application programming (IAP) and in-circuit programming (ICP). |
| ADC Resolution | 10-bit successive approximation ADC with up to 12 robust analog inputs - delivers ±1 LSB INL for precision sensor signal acquisition in noisy industrial environments. |
| Timers | Four independent timers: main clock controller (RTC/beep/clock-out), watchdog, 16-bit Timer A (PWM/input capture), 16-bit Timer B (dual capture/compare) - enables concurrent motor commutation, timing supervision, and event logging. |
| Communication | SPI synchronous interface (master/slave, 4-wire) and SCI asynchronous UART (full-duplex, programmable baud rate) - supports daisy-chained sensor networks and host MCU telemetry links. |
| Supply Range | 3.8 V to 5.5 V operating voltage with enhanced low-voltage detector (LVD) and auxiliary voltage detector (AVD) - ensures reliable reset and interrupt-driven brownout recovery down to 3.8 V. |
| Power Modes | Four low-power states: Halt (CPU stopped, peripherals active), Active-Halt (CPU halted, RAM retained), Wait (clock gated), Slow (RC oscillator only) - reduces active current to 1.5 mA typical and standby to 2 µA. |
Pinout & Package
TQFP44 (10 × 10 mm, 0.8 mm pitch) package with exposed thermal pad; 44-pin layout optimized for mixed-signal routing and EMC robustness in industrial PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply and ground | Dual power domains: VDD powers core/peripherals; VSS provides low-noise return path for analog and digital sections. |
| OSCIN/OSCOUT | Crystal/resonator interface | Supports 1–8 MHz external crystal or ceramic resonator; internal RC oscillator (1 MHz typ.) available as fallback clock source. |
| RESET | Asynchronous reset input | Active-low, Schmitt-triggered input with internal pull-up; initiates full hardware reset sequence including register initialization and flash boot vector fetch. |
| PA0–PA7, PB0–PB7, PC0–PC7, PD0–PD7 | Bi-directional I/O ports | 32 total I/O lines; up to 24 support alternate functions (SPI/SCI/timer signals); 12 pins rated for 20 mA sink capability - suitable for direct LED/relay drive. |
| AD0–AD11 | Analog input channels | 12 dedicated ADC input pins mapped across port A/B/C; share physical pins with digital I/O but electrically isolated during conversion via internal sample-and-hold. |
| CLKOUT, BEEP | System clock output / tone generator | CLKOUT provides buffered CPU clock for test/debug synchronization; BEEP drives piezoelectric transducers directly at 1–4 kHz without external driver circuitry. |
Key Features
| Feature | Design Value |
|---|---|
| In-Application Programming (IAP) | Enables field firmware updates via SCI or SPI without external programmer - preserves RAM contents and maintains real-time operation during flash reprogramming. |
| Programmable Low-Voltage Detector (LVD) | Configurable reset thresholds (4.0 V / 4.3 V / 4.6 V) with interrupt capability - allows graceful shutdown or safe state transition before brownout-induced corruption. |
| Nested Interrupt Controller | 10 priority-level vectors with automatic context save/restore - guarantees sub-5 µs latency for time-critical events like overcurrent fault handling. |
| High-Sink I/O Capability | 12 pins deliver 20 mA sink current at VDD = 5 V - eliminates need for external transistor drivers when interfacing with solenoids, optocouplers, or indicator LEDs. |
| Real-Time Clock & Beeper | Integrated RTC timer with calendar mode and dedicated BEEP output - provides timestamping and audible feedback without external components or GPIO resource consumption. |
Applications
| Industrial Motor Control Panel | Smart Power Meter Front-End |
|---|---|
Use Scenario: Real-time monitoring of three-phase current/voltage, thermal sensors, and relay status in DIN-rail mounted motor starters. IC Role / Device Role / Timing Role: Central control unit executing closed-loop speed regulation, fault logging, and HMI communication via SCI. Use Value: 10-bit ADC with 12-channel multiplexing captures synchronized analog samples; 16-bit Timer B generates precise PWM for gate drivers with <1% duty cycle jitter. |
Use Scenario: Acquisition and preprocessing of metering data (voltage, current, energy counters) before transmission to concentrator via RS-485. IC Role / Device Role / Timing Role: Sensor interface and protocol stack processor - handles ADC sampling, CRC calculation, and SCI-to-RS485 translation. Use Value: Built-in SCI with auto-baud detect and framing error recovery ensures robust serial link; LVD/AVD monitors supply integrity during grid voltage sags. |
| Programmable Logic Controller (PLC) I/O Module | Industrial HVAC Zone Controller |
Use Scenario: Modular digital input/output expansion card accepting 24 V DC field signals and driving 24 V solenoid valves or contactors. IC Role / Device Role / Timing Role: Deterministic I/O scheduler managing 32-channel scan cycle, debounce filtering, and watchdog supervision. Use Value: 32 bi-directional I/O lines with configurable pull-ups/downs and edge-triggered interrupts enable fast response to field device state changes (<10 µs latency). |
Use Scenario: Local temperature/humidity control node regulating damper actuators and fan speeds in commercial building zones. IC Role / Device Role / Timing Role: Environmental data aggregator and actuator sequencer - reads thermistors, drives PWM fans, and logs runtime statistics. Use Value: Integrated 10-bit ADC achieves ±0.5°C accuracy with internal reference; Slow mode reduces power to 2 µA during unoccupied periods while retaining RTC alarm wake-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ST72F324K6B5 | Same core and peripherals, but packaged in SDIP42 (600 mil) instead of TQFP44 - different pinout, larger footprint, no exposed thermal pad. | Preferred for through-hole prototyping or legacy board rework where TQFP reflow is unavailable. | Select when mechanical compatibility with existing SDIP sockets or wave-solder assembly is required. |
| STM8S105K4T6C | Newer STM8 architecture (Harvard, 16 MHz max), 16 KB Flash, 2 KB RAM, enhanced ADC (10-bit, 16 ch), but lacks integrated beep function and has different interrupt vector layout. | Better suited for cost-sensitive designs needing higher throughput or more RAM, but requires firmware porting and layout revision. | Choose for new designs targeting longer lifecycle support and improved code density - not drop-in compatible. |
Compared with ST72F324K6B5, the ST72F324J6B5 offers superior thermal performance in compact layouts due to its TQFP44 thermal pad; versus STM8S105K4T6C, it retains legacy toolchain compatibility and simpler interrupt nesting but lacks modern debug features like SWIM.
Availability
ST72F324J6B5 is available at Aetrix Electronics and suitable for industrial motor control panels, smart power meter front-ends, PLC I/O modules, and HVAC zone controllers requiring stable component supply and long-term obsolescence management.
Supply support for ST72F324J6B5 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 with vertical manufacturing and broad industrial qualification.
The ST7 family was designed specifically for cost-effective, robust 8-bit control in harsh industrial environments - emphasizing flash reliability, analog integration, and deterministic real-time behavior over raw speed.
FAQ
What is the maximum operating frequency of the ST72F324J6B5?
The ST72F324J6B5 operates at up to 8 MHz with an external crystal or ceramic resonator; its internal RC oscillator runs at 1 MHz (±10%). The integrated PLL supports 2× frequency multiplication, enabling a 16 MHz system clock when driven by an 8 MHz crystal - confirmed in Section 6.1 of the datasheet.
Does the ST72F324J6B5 support in-system programming via its serial interfaces?
Yes - the ST72F324J6B5 supports In-Circuit Programming (ICP) via the ICC interface using the dedicated ICCSEL/VPP pin, and In-Application Programming (IAP) via SCI or SPI without halting CPU execution. Both methods require specific command sequences and are fully documented in Sections 4.5 and 4.6.
How many ADC channels can be used simultaneously, and what is the conversion time?
The ST72F324J6B5 supports up to 12 ADC input channels, but conversions are sequential - not simultaneous. At 8 MHz CPU clock and default prescaler settings, a single 10-bit conversion takes 13 µs (130 clock cycles), as specified in Section 12.6.1 and Table 13 of the electrical characteristics.
Is the ST72F324J6B5 still recommended for new designs?
No - the ST72F324J6B5 is marked "NOT FOR NEW DESIGN" per the April 2008 datasheet revision. STMicroelectronics recommends migrating to the ST72324B series (e.g., ST72324BJ6B5) for new projects, which offer identical functionality with improved flash endurance and extended temperature range support.
ST72F324J6B5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 42-DIP (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:
- -10°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
ST72F324J6B5 FAQ
1.How can I place an order for ST72F324J6B5 through Aetrix?
Please submit a Request for Quotation (RFQ) for ST72F324J6B5 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 ST72F324J6B5 reliable?
The price and inventory of ST72F324J6B5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST72F324J6B5 is usually 5 days.
3.What payment methods are accepted for ST72F324J6B5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST72F324J6B5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ST72F324J6B5?
ST72F324J6B5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ST72F324J6B5 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 ST72F324J6B5?
For technical support, including ST72F324J6B5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST72F324J6B5 requirements.
6.How does Aetrix verify that ST72F324J6B5 is sourced from the original manufacturer or authorized distributors?
All ST72F324J6B5 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 ST72F324J6B5 meets industry standards.
7.What is the process for return or replacement of ST72F324J6B5?
All ST72F324J6B5 units undergo pre-shipment inspection (PSI). If there is an issue with ST72F324J6B5, 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 ST72F324J6B5 part is unused and in its original packaging.
Return procedure for ST72F324J6B5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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