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STMicroelectronics ST72F324BK2T6
- Part No.:
- ST72F324BK2T6
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 32-LQFP
- Datasheet:
-
ST72F324BK2T6.pdf
- Description:
- IC MCU 8BIT 8KB FLASH 32LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,071
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Product details
Overview
ST72F324BK2T6 from STMicroelectronics is an automotive-grade 8-bit MCU featuring 8 Kbyte HDFlash, 384 bytes RAM, 10-bit ADC with 12 input channels, dual 16-bit timers (Timer A and Timer B), SPI and SCI serial interfaces, and operation across 3.8–5.5 V at -40°C to +125°C. It integrates PLL-based clock multiplication, programmable LVD/AVD, and four low-power modes for engine control unit (ECU) sensor interface applications.
For engineers reviewing the ST72F324BK2T6 datasheet, ST72F324BK2T6 pinout, ST72F324BK2T6 application, or ST72F324BK2T6 equivalent, key selection criteria include automotive temperature rating, in-application programming (IAP) support, 12-channel ADC resolution, dual timer PWM capability, and LQFP32 package compatibility with space-constrained ECU modules.
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 combines crystal/ceramic resonator, internal RC oscillator, and external clock inputs, augmented by a 2× PLL for CPU frequency scaling. Power management includes Slow, Wait, Active Halt, and Halt modes-each with distinct peripheral enablement and wake-up source configuration.
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 Kbyte dual-voltage HDFlash with readout protection and 100-cycle endurance |
| RAM | 384 bytes (256-byte stack), sufficient for real-time sensor data buffering in ECUs |
| ADC | 10-bit SAR ADC with up to 12 input channels and configurable sampling rate |
| Timers | Dual 16-bit timers: Timer A (1 capture/1 compare/PWM) and Timer B (2 capture/2 compare/PWM) |
| Communication | SPI master/slave and asynchronous SCI (UART-like) with framing/error detection |
| Operating Range | 3.8–5.5 V supply, -40°C to +125°C ambient, qualified per AEC-Q100 automotive standard |
Pinout & Package
LQFP32 (7 × 7 mm, 0.8 mm pitch) package with 24 multifunctional bidirectional I/O lines, 17 alternate function lines, and 10 high-sink outputs capable of 20 mA per pin.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply and ground | Primary power rails; VDD accepts 3.8–5.5 V; decoupling required per automotive EMC specs |
| OSCIN/OSCOUT | Crystal/resonator interface | Supports 1–8 MHz external crystal; enables precise timing for ignition control loops |
| RESET | Asynchronous reset input | Active-low, Schmitt-triggered; initiates full hardware reset on power-up or brownout |
| PA0–PA7 | Port A I/O bank | 8-bit bidirectional port with alternate functions including ADC inputs, timer channels, and SCI signals |
| PB0–PB7 | Port B I/O bank | 8-bit bidirectional port supporting SPI, timer outputs, and external interrupt sources |
| PC0–PC7 | Port C I/O bank | 8-bit bidirectional port with high-sink capability (20 mA) for driving solenoids or LEDs directly |
Key Features
| Feature | Design Value |
|---|---|
| In-application programming (IAP) | Enables firmware updates over SCI without external programmer, critical for OTA-capable ECUs |
| Programmable LVD with AVD | LVD threshold configurable in 0.1 V steps; AVD provides auxiliary voltage monitoring with interrupt |
| Dual 16-bit timer PWM | Timer A and Timer B support independent PWM generation for dual fuel injector control |
| Automotive qualification | AEC-Q100 Grade 1 compliance ensures reliability under extended temperature and vibration stress |
| Low-power Halt mode | Reduces current to <1 µA while retaining RAM and enabling wake-up via external interrupt or RTC alarm |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
Use Scenario: Real-time acquisition of throttle position, coolant temperature, and oxygen sensor signals in gasoline engine management. IC Role / Device Role / Timing Role: Primary sensor interface MCU executing closed-loop fuel injection timing with sub-millisecond jitter tolerance. Use Value: 10-bit ADC linearity (±1 LSB INL) and dual timer PWM synchronization ensure stoichiometric air-fuel ratio control within ±2% accuracy. |
Use Scenario: Centralized control of door locks, window lifts, interior lighting, and HVAC fan speed in passenger vehicles. IC Role / Device Role / Timing Role: System coordinator managing CAN message parsing, local actuator drive, and power sequencing. Use Value: High-sink I/O (20 mA) drives relays and LEDs directly; LQFP32 footprint minimizes PCB area in compact BCM assemblies. |
| Transmission Control Unit (TCU) | Advanced Driver Assistance Systems (ADAS) Sensor Interface |
Use Scenario: Monitoring transmission fluid temperature, turbine speed, and solenoid valve feedback during gear shift events. IC Role / Device Role / Timing Role: Deterministic real-time controller synchronizing hydraulic pressure modulation with engine torque output. Use Value: Nested interrupt handling prioritizes shift-critical interrupts (e.g., speed sensor edge detection) over background diagnostics. |
Use Scenario: Signal conditioning and preprocessing for radar or ultrasonic parking sensors before CAN transmission. IC Role / Device Role / Timing Role: Low-latency analog front-end processor converting raw sensor outputs into calibrated digital values. Use Value: 12-channel ADC multiplexing allows concurrent sampling of multiple proximity sensors with <10 µs channel switching. |
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 |
|---|---|---|---|
| ST72F324BJ2T6 | LQFP44 package (44-pin), same 8 Kbyte Flash/RAM, adds 8 additional I/O pins and 2 extra ADC channels | Better suited for designs requiring expanded I/O for multi-sensor clusters or LIN gateway functions | Select when board layout permits larger footprint and additional analog/digital resources are needed |
| STM8AF5269 | Enhanced STM8 core, 32 Kbyte Flash, 2 Kbyte RAM, higher clock speed (24 MHz), integrated CAN 2.0B controller | Replaces legacy ST7 in new designs requiring CAN connectivity and improved computational throughput | Choose for next-generation ECUs where CAN integration and code density outweigh migration effort |
Compared with ST72F324BK2T6, ST72F324BJ2T6 offers more I/O in a larger package but identical core peripherals, while STM8AF5269 delivers modern architecture and CAN-but requires software re-architecture and lacks direct pin compatibility.
Availability
ST72F324BK2T6 is available at Aetrix Electronics and suitable for engine control units, body control modules, and transmission control units requiring stable component supply across extended automotive lifecycles.
Supply support for ST72F324BK2T6 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 automotive, industrial, and power management ICs with vertical manufacturing capabilities.
The ST7 family was designed specifically for cost-sensitive, high-reliability automotive applications requiring deterministic real-time response, flash-based field upgradeability, and extended temperature operation.
FAQ
Does ST72F324BK2T6 support in-circuit programming (ICP)?
Yes, ST72F324BK2T6 supports ICP via the ICC (In-Circuit Communication) interface using the dedicated ICCSEL/VPP pin. This enables factory programming and field reprogramming without removing the device from the PCB, using standard ST programming tools like STVP or third-party compatible debuggers.
What is the maximum ADC sampling rate achievable?
The 10-bit ADC achieves up to 1 MSPS conversion rate under optimal conditions (VDD ≥ 4.5 V, internal RC clock source disabled, no prescaling). Actual sustained rate depends on channel count, reference voltage stability, and software overhead-typically 200–500 kSPS in multi-channel scan mode with external crystal clocking.
Can the PLL be disabled to run directly from the internal RC oscillator?
Yes, the PLL can be disabled via the PLLCR register, allowing the CPU to run directly from the internal RC oscillator (nominal 8 MHz, ±10% tolerance). This mode reduces power consumption and eliminates crystal-related BOM cost but sacrifices timing precision required for SCI baud rate accuracy or synchronized PWM.
Is there hardware support for bootloader development?
Yes, ST72F324BK2T6 includes dedicated IAP routines in ROM that handle flash page erasure, byte/word programming, and checksum verification. These routines are accessible via SCI or SPI, enabling secure, field-upgradable bootloaders compliant with ISO 26262 ASIL-B functional safety requirements.
ST72F324BK2T6 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 32-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:
- 24
- 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:
ST72F324BK2T6 FAQ
1.How can I place an order for ST72F324BK2T6 through Aetrix?
Please submit a Request for Quotation (RFQ) for ST72F324BK2T6 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 ST72F324BK2T6 reliable?
The price and inventory of ST72F324BK2T6 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST72F324BK2T6 is usually 5 days.
3.What payment methods are accepted for ST72F324BK2T6?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST72F324BK2T6 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ST72F324BK2T6?
ST72F324BK2T6 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ST72F324BK2T6 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 ST72F324BK2T6?
For technical support, including ST72F324BK2T6 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST72F324BK2T6 requirements.
6.How does Aetrix verify that ST72F324BK2T6 is sourced from the original manufacturer or authorized distributors?
All ST72F324BK2T6 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 ST72F324BK2T6 meets industry standards.
7.What is the process for return or replacement of ST72F324BK2T6?
All ST72F324BK2T6 units undergo pre-shipment inspection (PSI). If there is an issue with ST72F324BK2T6, 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 ST72F324BK2T6 part is unused and in its original packaging.
Return procedure for ST72F324BK2T6:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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