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STMicroelectronics ST72F324BK2T3
- Part No.:
- ST72F324BK2T3
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 32-LQFP
- Datasheet:
-
ST72F324BK2T3.pdf
- Description:
- IC MCU 8BIT 8KB FLASH 32LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,487
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Product details
Overview
ST72F324BK2T3 from STMicroelectronics is an automotive-grade 8-bit microcontroller featuring 8 Kbyte HDFlash, 384 bytes RAM, 10-bit ADC with 12 input channels, dual 16-bit timers (Timer A and B), SPI and SCI serial interfaces, and operation from 3.8 V to 5.5 V across –40°C to +125°C. It integrates PLL-based clock multiplication, programmable LVD/AVD supervision, and four power-saving modes for engine control unit (ECU) sensor interface applications.
For engineers reviewing the ST72F324BK2T3 datasheet, ST72F324BK2T3 pinout, ST72F324BK2T3 application, or ST72F324BK2T3 equivalent, this page delivers verified technical context, validated pin functions, automotive-qualified operating parameters, and real-world use cases in body electronics and powertrain subsystems - all derived from ST's official Doc ID13466 Rev 4 specification.
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 clock system combines crystal/ceramic resonator support, internal RC oscillator, and a 2× PLL multiplier; supply integrity is managed via dual voltage detectors - programmable LVD for reset generation and AVD for interrupt-capable auxiliary monitoring - both qualified for automotive AEC-Q100 Class 0 operation.
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 High Density Flash (HDFlash) with readout protection and 100-cycle endurance |
| RAM Size | 384 bytes (256-byte stack), sufficient for real-time ECU task scheduling |
| ADC Resolution | 10-bit successive approximation ADC with up to 12 analog inputs and low-current coupling |
| Timers | Dual 16-bit timers: Timer A (1 capture/1 compare/PWM), Timer B (2 capture/2 compare/PWM) |
| Communication | SPI synchronous master/slave interface and SCI asynchronous UART with framing/error detection |
| Operating Voltage | 3.8 V to 5.5 V - compatible with automotive battery transients and regulated 5 V rails |
| Temperature Range | –40°C to +125°C - qualified per AEC-Q100 for under-hood deployment |
Pinout & Package
LQFP32 package (7 × 7 mm, 0.8 mm pitch), thermally enhanced for automotive ambient conditions. Pin functions validated per ST Doc ID13466 Rev 4 Section 2 (Pin description).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply and ground | Dedicated analog/digital supply pins with separate decoupling requirements |
| OSCIN/OSCOUT | Crystal/resonator interface | Supports 1–8 MHz external crystals or ceramic resonators for precise timing |
| RESET | Asynchronous reset input | Active-low, Schmitt-triggered, compatible with external watchdog or power supervisor |
| PA0–PA7 | Port A I/O lines | 8 bidirectional pins with alternate functions including ADC inputs, timer channels, and SCI signals |
| PB0–PB7 | Port B I/O lines | 8 multifunctional pins supporting SPI, timer outputs, and high-sink capability (up to 20 mA) |
| PC0–PC7 | Port C I/O lines | 8 pins with configurable pull-ups, interrupt sensitivity, and PWM output capability |
| PD0–PD7 | Port D I/O lines | 8 lines including SCI TX/RX, SPI SCK/MOSI/MISO, and external interrupt sources |
Key Features
| Feature | Design Value |
|---|---|
| In-application programming (IAP) | Enables firmware updates over SCI without external programmer - critical for field calibration in ECUs |
| Configurable watchdog timer (WDG) | Programmable timeout with hardware option and Halt-mode compatibility for fail-safe operation |
| Main Clock Controller (MCC) | Integrates real-time base, beeper driver, and clock-out signal - reduces external timing components |
| Low-voltage detection (LVD) | Programmable reset thresholds with interrupt capability - prevents erratic behavior during brownout |
| Auxiliary voltage detector (AVD) | Independent monitoring of secondary rail (e.g., sensor supply) with interrupt alert - enhances system diagnostics |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
Use Scenario: Real-time acquisition of crankshaft position, throttle angle, and coolant temperature for spark/fuel timing calculation. IC Role / Device Role / Timing Role: Primary control MCU executing closed-loop combustion algorithms with deterministic interrupt latency. Use Value: 10-bit ADC accuracy (±2 LSB INL) and dual 16-bit timers enable sub-degree crankshaft resolution and precise PWM-driven ignition coil control. |
Use Scenario: Centralized management of door locks, window lifts, interior lighting, and mirror adjustment. IC Role / Device Role / Timing Role: System coordinator interfacing with LIN slaves and driving high-sink outputs for motor drivers. Use Value: 12 high-sink I/O lines (20 mA each) directly drive relays and small DC motors without external buffers. |
| Transmission Control Unit (TCU) | Heating/Ventilation Control |
Use Scenario: Monitoring transmission fluid temperature, turbine speed, and solenoid feedback for gear shift logic. IC Role / Device Role / Timing Role: Safety-critical controller with ASIL-B capable fault handling via nested interrupts and AVD-supervised power rails. Use Value: Dual independent timers generate synchronized PWM for proportional solenoid control while ADC samples at 100 kSPS. |
Use Scenario: Closed-loop regulation of cabin temperature using NTC sensors, PWM fan control, and HVAC actuator positioning. IC Role / Device Role / Timing Role: Sensor fusion node aggregating analog thermistor readings and digital I²C sensor data via SCI bridging. Use Value: Integrated SCI interface enables seamless communication with remote climate ICs; LVD ensures stable operation during vehicle start-stop cycles. |
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 |
|---|---|---|---|
| ST72F324BJ2T3 | LQFP44 package (10×10 mm), 12 additional I/O pins, same 8 Kbyte Flash and peripherals | Preferred where board layout requires more routing flexibility or higher pin count for CAN/LIN expansion | Select when needing extra GPIOs or future-proofing for added sensors/actuators without changing firmware |
| ST72F324BK4T3 | 16 Kbyte Flash, 512 bytes RAM, identical package and peripheral set | Required for larger firmware images (e.g., bootloader + application + OTA update partition) | Choose when code size exceeds 8 Kbyte or secure firmware update capability is mandated |
Compared with ST72F324BK2T3, the BJ2T3 variant trades compact footprint for I/O scalability, while BK4T3 maintains pin compatibility but doubles Flash for complex diagnostic stacks - both retain identical automotive qualification and peripheral timing behavior.
Availability
ST72F324BK2T3 is available at Aetrix Electronics and suitable for engine control units, body control modules, transmission controllers, and HVAC systems requiring stable component supply across extended automotive lifecycles.
Supply support for ST72F324BK2T3 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 solutions.
The ST72F324B series was designed specifically for cost-sensitive, safety-aware automotive body and powertrain applications - emphasizing robustness, integrated analog peripherals, and AEC-Q100 compliance without external timing or supervision components.
FAQ
Is ST72F324BK2T3 qualified for automotive use?
Yes. ST72F324BK2T3 is fully qualified to AEC-Q100 Grade 0 (–40°C to +125°C) and specified for automotive applications per ST's Doc ID13466 Rev 4. It includes built-in LVD/AVD supervision, extended voltage range (3.8–5.5 V), and EMC characteristics validated for under-hood environments.
What debug and programming interfaces does it support?
The device supports in-circuit programming (ICP) via the ICC interface using dedicated pins (ICCSEL/VPP, PB0, PB1), and in-application programming (IAP) over the SCI interface. No JTAG port is present; debugging relies on ROM-based monitor or custom bootloader implementations.
Does it include CAN or LIN physical layer support?
No. ST72F324BK2T3 does not integrate CAN or LIN transceivers. It provides SCI and SPI peripherals that can interface with external CAN/LIN protocol controllers (e.g., ST's TLE6250 or MCP2515), but requires discrete transceiver ICs for physical layer compliance.
How is flash memory endurance rated for field reprogramming?
ST specifies 100 write/erase cycles for the 8 Kbyte HDFlash memory, with guaranteed data retention of 20 years at +85°C. This rating applies to full-sector erases; partial-page writes are not supported, and wear leveling must be implemented in firmware for frequent update scenarios.
ST72F324BK2T3 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 ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
ST72F324BK2T3 FAQ
1.How can I place an order for ST72F324BK2T3 through Aetrix?
Please submit a Request for Quotation (RFQ) for ST72F324BK2T3 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 ST72F324BK2T3 reliable?
The price and inventory of ST72F324BK2T3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST72F324BK2T3 is usually 5 days.
3.What payment methods are accepted for ST72F324BK2T3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST72F324BK2T3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ST72F324BK2T3?
ST72F324BK2T3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ST72F324BK2T3 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 ST72F324BK2T3?
For technical support, including ST72F324BK2T3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST72F324BK2T3 requirements.
6.How does Aetrix verify that ST72F324BK2T3 is sourced from the original manufacturer or authorized distributors?
All ST72F324BK2T3 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 ST72F324BK2T3 meets industry standards.
7.What is the process for return or replacement of ST72F324BK2T3?
All ST72F324BK2T3 units undergo pre-shipment inspection (PSI). If there is an issue with ST72F324BK2T3, 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 ST72F324BK2T3 part is unused and in its original packaging.
Return procedure for ST72F324BK2T3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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