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STMicroelectronics ST72F324BJ4T6
- Part No.:
- ST72F324BJ4T6
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 44-LQFP
- Datasheet:
-
ST72F324BJ4T6.pdf
- Description:
- IC MCU 8BIT 16KB FLASH 44LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,742
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Product details
Overview
ST72F324BJ4T6 from STMicroelectronics is an automotive-grade 8-bit microcontroller featuring 16 Kbyte HDFlash program memory, 512 bytes RAM, 10-bit ADC with 12 input channels, dual 16-bit timers (Timer A and Timer B), SPI and SCI serial interfaces, and PLL-based clock multiplication. It operates from 3.8 V to 5.5 V across –40°C to +125°C and targets engine control units, body electronics, and dashboard instrumentation.
For engineers reviewing the ST72F324BJ4T6 datasheet, ST72F324BJ4T6 pinout, ST72F324BJ4T6 application, or ST72F324BJ4T6 equivalent, key selection criteria include its AEC-Q100 qualification, LQFP44-10×10 mm package with 32 I/O lines, programmable low-voltage detector (LVD), in-application programming (IAP) support, and real-time clock/beeper integrated into the main clock controller.
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 clock system integrates three sources - crystal/ceramic resonator, internal RC oscillator, and external clock - plus a 2× PLL for frequency multiplication. Power management includes four low-power modes (Slow, Wait, Active Halt, Halt), AVD with interrupt capability, and configurable watchdog timer with hardware option.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 8-bit ST7 CPU with Harvard bus, 63 instructions, 17 addressing modes |
| Flash Memory | 16 Kbyte HDFlash with readout protection, 100 write/erase cycles, 20-year data retention |
| RAM Size | 512 bytes (including 256-byte stack), battery-backed operation not supported |
| ADC Resolution | 10-bit successive approximation ADC with 12 analog input channels, ±1 LSB INL |
| Timers | Two 16-bit timers: Timer A (1 capture/1 compare/PWM), Timer B (2 capture/2 compare/PWM) |
| Communication | SPI master/slave interface and asynchronous SCI (UART-compatible) with framing/error detection |
| Operating Voltage | 3.8 V to 5.5 V supply range, qualified for automotive battery transients per ISO 7637-2 |
| Temperature Range | –40°C to +125°C ambient, AEC-Q100 Grade 1 compliant |
Pinout & Package
LQFP44 package (10 × 10 mm, 0.8 mm pitch), thermally enhanced with exposed pad; RoHS-compliant, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply and ground | Dual power domains: VDD for digital core/I/O, VSS as common reference; decoupling required per datasheet layout guidelines |
| OSCIN/OSCOUT | Crystal oscillator input/output | Supports 1–8 MHz quartz or ceramic resonator; internal load capacitors configurable via register |
| RESET | Asynchronous reset input | Active-low, Schmitt-triggered, compatible with open-drain or push-pull drivers; initiates cold start sequence |
| PA0–PA7 | Port A bidirectional I/O | 8-bit port with alternate functions including ADC inputs, SPI signals, and timer capture/compare outputs |
| PD0–PD7 | Port D bidirectional I/O | 8-bit port supporting SCI TX/RX, external interrupts, and high-sink (20 mA) output capability on selected pins |
| ICCSEL/VPP | In-circuit programming control | Selects ICC mode for programming; doubles as VPP during Flash programming (5.5 V required) |
Key Features
| Feature | Design Value |
|---|---|
| In-application programming (IAP) | Enables firmware updates over SCI or SPI without external programmer; requires user-defined bootloader space |
| Enhanced LVD with AVD | Programmable reset thresholds (e.g., 4.2 V/3.8 V); auxiliary voltage detector triggers interrupt on monitored rail deviation |
| Real-time clock & beeper | Integrated RTC timer driven by dedicated 32.768 kHz input; beeper output supports audible alerts at programmable frequencies |
| High-sink I/O capability | Up to 12 pins deliver 20 mA sink current - suitable for direct LED driving or relay coil control without external drivers |
| Nested interrupt controller | Hardware prioritization across 10 vectors; software-configurable priority levels enable deterministic ISR response in safety-critical tasks |
Applications
| Engine Control Unit (ECU) | Instrument Cluster Display |
|---|---|
Use Scenario: Real-time monitoring of crankshaft position, throttle angle, and coolant temperature in gasoline engine management. IC Role / Device Role / Timing Role: Primary control MCU executing closed-loop fuel injection timing and spark advance algorithms at ≤10 ms cycle intervals. Use Value: Integrated 10-bit ADC with 12-channel scan mode enables simultaneous sensor sampling; PLL ensures stable 16 MHz core clock under battery voltage fluctuation. |
Use Scenario: Driving analog gauges, backlighting, and warning indicators in vehicle dashboards. IC Role / Device Role / Timing Role: System controller managing CAN message parsing (via external transceiver), PWM dimming, and buzzer feedback. Use Value: High-sink I/O pins directly drive LEDs and piezo buzzers; SCI interface handles diagnostics communication with service tools. |
| Body Control Module (BCM) | Heating/Ventilation Control |
Use Scenario: Centralized management of door locks, window lifts, interior lighting, and mirror adjustment. IC Role / Device Role / Timing Role: Low-power coordinator using Wait and Halt modes to minimize quiescent current during vehicle sleep states. Use Value: Four power-saving modes reduce active current to 1.5 mA (Wait) and standby current to 1.2 µA (Halt); AVD monitors backup battery health. |
Use Scenario: Closed-loop control of blower motor speed, blend door actuation, and cabin temperature sensing. IC Role / Device Role / Timing Role: Sensor fusion hub aggregating NTC thermistor readings, potentiometer inputs, and PWM fan control signals. Use Value: 16-bit Timer B generates precise 25 kHz PWM for brushless blower motors; ADC linearity (±1 LSB) ensures accurate thermal feedback. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit automotive microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ST72F324BK4T6 | LQFP32 package (7×7 mm), 16 Kbyte Flash, 512-byte RAM, reduced I/O count (24 vs. 32) | Space-constrained modules where fewer peripherals and smaller footprint are prioritized | Select when board area is critical and full LQFP44 I/O count is unnecessary |
| STM8AF5269 | STM8 core, 32 Kbyte Flash, 2 Kbyte RAM, enhanced ESD/EMC robustness, same AEC-Q100 Grade 1 rating | New designs requiring longer lifecycle support, higher code density, and improved debug capabilities | Prefer for new automotive projects due to active product status and extended toolchain support |
Compared with ST72F324BK4T6, the ST72F324BJ4T6 offers greater I/O flexibility and peripheral routing in LQFP44; versus STM8AF5269, it provides legacy code compatibility but lacks modern debugging features and production longevity.
Availability
ST72F324BJ4T6 is available at Aetrix Electronics and suitable for engine control units, instrument clusters, and body control modules requiring stable component supply throughout extended automotive production lifecycles.
Supply support for ST72F324BJ4T6 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 automotive, industrial, and consumer markets.
The ST7 family was engineered specifically for cost-sensitive, high-reliability automotive applications demanding AEC-Q100 compliance, robust EMC performance, and long-term supply stability in harsh environments.
FAQ
Is ST72F324BJ4T6 qualified for automotive use?
Yes. The ST72F324BJ4T6 is AEC-Q100 Grade 1 qualified (–40°C to +125°C), tested for automotive reliability including HTOL, TC, and ESD per JESD22 standards. It meets ISO 16750-2 for electrical load dump and ISO 7637-2 for transient immunity, with built-in LVD and AVD for system-level fault detection.
Does this MCU support in-system programming?
Yes. ST72F324BJ4T6 supports both in-circuit programming (ICP) via ICCSEL/VPP pin and in-application programming (IAP) through its SCI or SPI interface. IAP allows field firmware updates without halting system operation, provided sufficient Flash space is reserved for the bootloader and proper erase/write sequencing is implemented.
What are the power supply requirements for reliable operation?
The device requires a clean 3.8 V to 5.5 V supply with ≤100 mV ripple. Decoupling mandates 100 nF ceramic capacitor near each VDD pin and bulk capacitance ≥10 µF. Internal LVD monitors VDD and can generate reset or interrupt at user-selectable thresholds (e.g., 4.2 V or 3.8 V), ensuring safe operation during brownout conditions.
Can ST72F324BJ4T6 replace ST72F324BJ2T6 or ST72F324BJ6T6?
Yes - pin-compatible within the ST72F324B-Jx series. ST72F324BJ4T6 (16 Kbyte Flash, 512-byte RAM) sits between BJ2 (8 Kbyte/384-byte) and BJ6 (32 Kbyte/1024-byte). Firmware must be recompiled to match memory map and stack depth; no hardware change is needed, but verify Flash endurance (100 cycles) and RAM usage margins for target application.
ST72F324BJ4T6 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:
- 16KB (16K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 512 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:
ST72F324BJ4T6 FAQ
1.How can I place an order for ST72F324BJ4T6 through Aetrix?
Please submit a Request for Quotation (RFQ) for ST72F324BJ4T6 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 ST72F324BJ4T6 reliable?
The price and inventory of ST72F324BJ4T6 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST72F324BJ4T6 is usually 5 days.
3.What payment methods are accepted for ST72F324BJ4T6?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST72F324BJ4T6 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ST72F324BJ4T6?
ST72F324BJ4T6 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ST72F324BJ4T6 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 ST72F324BJ4T6?
For technical support, including ST72F324BJ4T6 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST72F324BJ4T6 requirements.
6.How does Aetrix verify that ST72F324BJ4T6 is sourced from the original manufacturer or authorized distributors?
All ST72F324BJ4T6 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 ST72F324BJ4T6 meets industry standards.
7.What is the process for return or replacement of ST72F324BJ4T6?
All ST72F324BJ4T6 units undergo pre-shipment inspection (PSI). If there is an issue with ST72F324BJ4T6, 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 ST72F324BJ4T6 part is unused and in its original packaging.
Return procedure for ST72F324BJ4T6:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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