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STMicroelectronics ST72F324BK2T3TR
- Part No.:
- ST72F324BK2T3TR
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 32-LQFP
- Datasheet:
-
ST72F324BK2T3TR.pdf
- Description:
- IC MCU 8BIT 8KB FLASH 32LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,836
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Product details
Overview
ST72F324BK2T3TR 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 - deployed in engine control units and body electronics for real-time sensor interfacing and actuator control.
For engineers reviewing the ST72F324BK2T3TR datasheet, ST72F324BK2T3TR pinout, ST72F324BK2T3TR application, or ST72F324BK2T3TR equivalent, key selection criteria include automotive temperature rating, HDFlash endurance (100 write cycles), nested interrupt controller with 10 vectors, LQFP32 package compatibility, and integrated low-voltage supervisor with programmable reset thresholds.
Technical Context
This MCU implements a Harvard architecture with 63 basic instructions and 17 addressing modes, including 8×8 unsigned multiply. Its clock system integrates a PLL for 2× frequency multiplication, internal RC oscillator, crystal/ceramic resonator support, and external clock input - enabling flexible timing configuration for deterministic real-time execution.
The peripheral set is tightly coupled to automotive functional safety needs: enhanced LVD with auxiliary voltage detector (AVD) interrupt capability, four power-saving modes (Slow, Wait, Active Halt, Halt), and configurable watchdog timer with hardware option and WDGHALT mode - all operating within the AEC-Q100 qualified environment.
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), 100 write/erase cycles, 20-year data retention |
| RAM | 384 bytes (256-byte stack), SRAM with fast access for real-time variables |
| ADC | 10-bit successive-approximation ADC with up to 12 analog inputs, low-current coupling |
| Timers | Two 16-bit timers: Timer A (1 capture/1 compare/PWM), Timer B (2 capture/2 compare/PWM) |
| Communication | SPI synchronous interface + SCI asynchronous UART-compatible interface |
| Supply Range | 3.8 V to 5.5 V, qualified for automotive battery rail variations |
| Temperature Range | -40°C to +125°C ambient, AEC-Q100 Grade 2 compliant |
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 (20 mA per pin). Power and ground pins distributed for noise resilience in automotive PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply and ground | Dual power domains: VDD for core/peripherals, VSS reference for analog/digital sections |
| PA0–PA7 | Port A I/O | 8-bit bidirectional port with interrupt-on-change, alternate functions include Timer A/B signals and ADC inputs |
| PB0–PB7 | Port B I/O | 8-bit bidirectional port supporting SPI (MOSI/MISO/SCK), SCI (TX/RX), and external interrupts |
| PC0–PC7 | Port C I/O | 8-bit port with high-sink capability (20 mA), used for LED drivers or relay control in body modules |
| RESET | Asynchronous reset input | Active-low, Schmitt-triggered, compatible with external reset supervisors |
| OSCIN/OSCOUT | Crystal oscillator interface | Supports 1–8 MHz quartz or ceramic resonators; internal load capacitors configurable via option bytes |
| ICCSEL/VPP | In-circuit programming control | Selects ICC mode for flash programming; doubles as VPP during high-voltage programming |
Key Features
| Feature | Design Value |
|---|---|
| In-application programming (IAP) | Enables firmware updates over SCI without external programmer, critical for OTA-capable ECUs |
| Nested interrupt controller | 10 priority-level vectors plus TRAP/RESET, allowing deterministic response to concurrent events (e.g., ADC conversion + CAN interrupt) |
| Enhanced LVD with AVD | Programmable reset threshold (2.8 V / 3.3 V / 4.0 V) + auxiliary voltage monitor with interrupt - supports brown-out detection and battery monitoring |
| Real-time clock & beeper | MCC/RTC module provides timekeeping and audible feedback generation without external components |
| Low-power modes | Four modes (Slow, Wait, Active Halt, Halt) with wake-up on interrupt or external event - reduces quiescent current to <1 µA in Halt |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
Use Scenario: Real-time acquisition of crankshaft position, throttle angle, and coolant temperature for fuel injection timing. IC Role / Device Role / Timing Role: Central control unit executing closed-loop combustion algorithms with sub-millisecond interrupt latency. Use Value: Integrated 10-bit ADC and dual 16-bit timers enable precise sensor sampling and PWM-driven injector control within single-chip solution. |
Use Scenario: Managing door locks, window lifts, interior lighting, and mirror adjustment via LIN or discrete wiring. IC Role / Device Role / Timing Role: Local intelligence node coordinating multi-channel I/O and serial communication with gateway MCU. Use Value: 24 I/O lines with high-sink capability drive relays and LEDs directly; SCI interface enables LIN physical layer compatibility. |
| Climate Control System | Instrument Cluster |
Use Scenario: Reading cabin temperature, humidity, and solar radiation sensors while driving HVAC actuators. IC Role / Device Role / Timing Role: Sensor fusion processor with ADC oversampling and timer-based fan speed regulation. Use Value: 12 ADC input channels and programmable watchdog ensure reliable environmental monitoring under varying EMI conditions. |
Use Scenario: Driving analog gauges, warning indicators, and backlight dimming in digital dashboards. IC Role / Device Role / Timing Role: Display controller generating pulse-width modulated backlight signals and decoding CAN messages. Use Value: MCC/RTC module provides accurate timekeeping for odometer and service interval tracking; SPI interface connects to display driver ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit automotive MCU applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ST72F324BJ2T3TR | LQFP44 package (44-pin), same 8 Kbyte Flash/RAM, adds 8 extra I/O and 2 additional ADC channels | Preferred where board layout allows larger footprint and higher I/O count is required (e.g., multi-sensor gateway) | Select when pin count >32 needed; not drop-in compatible due to package and pin mapping differences |
| STM8AF5269 | STM8 core, 32 Kbyte Flash, enhanced debug (SWIM), higher clock speed (24 MHz), but no built-in beeper or RTC | Better suited for next-gen ECUs requiring higher code density and faster interrupt response | Choose for migration path: superior tooling and longer lifecycle, but requires firmware rearchitecture |
Compared with ST72F324BK2T3TR, the ST72F324BJ2T3TR offers expanded I/O in LQFP44 for complex nodes, while STM8AF5269 delivers modern architecture and debug features at the cost of legacy peripheral compatibility - both require PCB and firmware adaptation.
Availability
ST72F324BK2T3TR is available at Aetrix Electronics and suitable for engine control units, body control modules, and climate control systems requiring stable component supply across extended automotive temperature ranges and long production lifecycles.
Supply support for ST72F324BK2T3TR 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 robustness against voltage transients, wide temperature operation, and integrated peripherals to minimize external components - targeting ECU, BCM, and instrumentation subsystems.
FAQ
Is ST72F324BK2T3TR AEC-Q100 qualified?
Yes, ST72F324BK2T3TR is qualified to AEC-Q100 Grade 2 (-40°C to +125°C), with full characterization per stress test requirements including HTOL, TCT, and ESD. The qualification applies to the LQFP32 package variant and is documented in ST's official automotive product release notes and qualification reports.
What programming interfaces does ST72F324BK2T3TR support?
It supports in-circuit programming (ICP) via the ICC interface using the ICCSEL/VPP pin, and in-application programming (IAP) over the SCI interface. No external high-voltage programmer is required for field updates, and the internal bootloader enables firmware upgrades without halting real-time operation.
Does this MCU include a hardware real-time clock (RTC)?
Yes - the Main Clock Controller (MCC) includes a dedicated real-time clock (RTC) timer with calendar functionality, driven by a separate 32.768 kHz watch crystal input or internal RC source. It supports alarm interrupts and operates in Wait and Active Halt modes, retaining time during low-power states.
Can ST72F324BK2T3TR operate from a 12 V automotive battery directly?
No - it requires a regulated 3.8–5.5 V supply. An external voltage regulator (e.g., LDO or DC-DC converter) must condition the 12 V battery rail. The MCU's enhanced LVD monitors the regulated VDD and triggers reset if voltage drops below programmable thresholds (2.8 V / 3.3 V / 4.0 V), ensuring safe shutdown during brown-out events.
ST72F324BK2T3TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 32-LQFP
- Series:
- ST7
- Packaging:
- Tape & Reel (TR)
- 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:
ST72F324BK2T3TR FAQ
1.How can I place an order for ST72F324BK2T3TR through Aetrix?
Please submit a Request for Quotation (RFQ) for ST72F324BK2T3TR 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 ST72F324BK2T3TR reliable?
The price and inventory of ST72F324BK2T3TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST72F324BK2T3TR is usually 5 days.
3.What payment methods are accepted for ST72F324BK2T3TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST72F324BK2T3TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ST72F324BK2T3TR?
ST72F324BK2T3TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ST72F324BK2T3TR 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 ST72F324BK2T3TR?
For technical support, including ST72F324BK2T3TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST72F324BK2T3TR requirements.
6.How does Aetrix verify that ST72F324BK2T3TR is sourced from the original manufacturer or authorized distributors?
All ST72F324BK2T3TR 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 ST72F324BK2T3TR meets industry standards.
7.What is the process for return or replacement of ST72F324BK2T3TR?
All ST72F324BK2T3TR units undergo pre-shipment inspection (PSI). If there is an issue with ST72F324BK2T3TR, 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 ST72F324BK2T3TR part is unused and in its original packaging.
Return procedure for ST72F324BK2T3TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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