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STMicroelectronics ST72F324BK4T3
- Part No.:
- ST72F324BK4T3
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 32-LQFP
- Datasheet:
-
ST72F324BK4T3.pdf
- Description:
- IC MCU 8BIT 16KB FLASH 32LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,572
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Product details
Overview
ST72F324BK4T3 from STMicroelectronics is an automotive-grade 8-bit microcontroller featuring 16 Kbyte HDFlash program memory, 512 bytes RAM, 10-bit ADC with up to 12 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 ST72F324BK4T3 datasheet, ST72F324BK4T3 pinout, ST72F324BK4T3 application, or ST72F324BK4T3 equivalent, key selection considerations include its LQFP44 package, automotive temperature rating, in-application programming (IAP) support, low-voltage supervisor with programmable thresholds, and nested interrupt controller with 10 vectors.
Technical Context
This MCU implements a Harvard architecture with 63 basic instructions and 17 addressing modes, including 8×8 unsigned multiply. Its central processing unit integrates a 3-stage pipeline and supports real-time base generation via the Main Clock Controller (MCC/RTC).
The system-level timing architecture combines multiple clock sources - external crystal/ceramic resonator (up to 8 MHz), internal RC oscillator (8 MHz ±20%), and external clock input - with a 2× PLL multiplier and four power-saving modes (Slow, Wait, Active Halt, Halt) for deterministic wake-up latency and current optimization in automotive subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 8-bit ST7 CPU with 3-stage pipeline and 63-instruction set |
| Flash Memory | 16 Kbyte High Density Flash (HDFlash) with readout protection and 100-cycle endurance |
| RAM Size | 512 bytes (including 256-byte stack space) |
| ADC Resolution | 10-bit successive approximation ADC with up to 12 analog inputs and configurable sampling rate |
| Timers | Two 16-bit timers: Timer A (1 capture/1 compare/PWM) and Timer B (2 capture/2 compare/PWM) |
| Communication | SPI synchronous interface and SCI asynchronous UART-compatible interface |
| Operating Voltage | 3.8 V to 5.5 V - compatible with automotive battery rail under load dump and cold-crank conditions |
| Temperature Range | –40°C to +125°C - qualified per AEC-Q100 Grade 2 for under-hood applications |
Pinout & Package
LQFP44 (10 × 10 mm, 0.8 mm pitch) package with exposed thermal pad; RoHS-compliant, automotive-qualified lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply and ground | Dual power domains: VDD supplies core/peripherals; VSS is common reference for analog/digital sections |
| OSCIN / OSCOUT | Crystal/resonator interface | Supports 1–8 MHz external crystal or ceramic resonator; enables precise timing for CAN/SCI baud rate generation |
| RESET | Asynchronous reset input | Active-low, Schmitt-triggered input with internal pull-up; initiates full hardware reset on assertion |
| PA0–PA7, PB0–PB7, PC0–PC7, PD0–PD7 | Bi-directional I/O ports | 32 total multifunction pins; configurable as GPIO, timer inputs/outputs, SPI/SCI signals, or ADC inputs |
| AD0–AD11 | Analog input channels | Shared with port pins (e.g., PA0 = AD0); enable direct sensor interfacing without external mux |
| CLKOUT | Clock output | Programmable output of CPU clock, prescaled clock, or RTC signal - used for system-level synchronization or debug |
Key Features
| Feature | Design Value |
|---|---|
| In-application programming (IAP) | Enables firmware updates over SCI or SPI without external programmer - critical for OTA-capable ECUs |
| Enhanced LVD with AVD | Programmable low-voltage reset threshold plus auxiliary voltage detector with interrupt - supports fail-safe shutdown during brown-out |
| Nested interrupt controller | 10 priority-programmable vectors with TRAP and RESET handling - ensures deterministic response to safety-critical events |
| High-sink I/O capability | 12 pins rated for 20 mA sink current - drives LEDs, relays, or discrete transistors directly without buffer stages |
| Real-time clock & beeper | MCC/RTC module provides calendar timekeeping and audible feedback generation - used in instrument cluster timing and alerts |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
Use Scenario: Real-time monitoring of crankshaft position, throttle angle, and coolant temperature in gasoline engines. IC Role / Device Role / Timing Role: Primary MCU executing closed-loop fuel injection and spark timing algorithms with sub-millisecond interrupt latency. Use Value: 16-bit timers with input capture provide precise crankshaft angular measurement; 10-bit ADC resolves sensor signals with ≤1 LSB INL for accurate air-fuel ratio calculation. |
Use Scenario: Centralized management of door locks, window lifts, lighting, and wiper sequencing in passenger vehicles. IC Role / Device Role / Timing Role: System coordinator interfacing with LIN slaves and driving high-current loads via GPIO. Use Value: 12 high-sink I/O pins directly drive solenoids and lamps; SPI enables communication with EEPROM for configuration storage. |
| Instrument Cluster | Heating/Ventilation Control |
Use Scenario: Rendering speedometer, tachometer, and warning indicators using stepper motors and LED arrays. IC Role / Device Role / Timing Role: Real-time display controller with MCC/RTC-driven clock-out signal synchronizing display refresh and buzzer alerts. Use Value: CLKOUT pin delivers stable 1 MHz signal for segment driver timing; SCI interface receives CAN message data via gateway MCU. |
Use Scenario: Closed-loop regulation of cabin temperature using NTC sensors, PWM-controlled blower, and actuator drivers. IC Role / Device Role / Timing Role: Sensor fusion node aggregating analog thermistor readings and generating variable-speed fan control. Use Value: 12-channel ADC scans 6+ NTC inputs simultaneously; Timer B PWM output achieves 0.5% duty cycle resolution for quiet blower operation. |
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 |
|---|---|---|---|
| ST72F324BJ4T3 | LQFP32 package (7×7 mm), 16 Kbyte Flash, same core/peripherals but reduced I/O count (24 vs. 32) | Space-constrained modules where fewer analog inputs or GPIOs are required | Select when board area is critical and peripheral count allows reduction |
| STM8AF5269 | STM8 core, 32 Kbyte Flash, enhanced ADC (10-bit, 16 ch), integrated CAN 2.0B controller | Systems requiring native CAN bus connectivity without external transceiver | Choose when CAN protocol stack integration and higher Flash density outweigh legacy ST7 toolchain dependency |
Compared with ST72F324BK4T3, the BJ4T3 variant trades package size and I/O for compactness, while the STM8AF5269 upgrades core architecture and adds CAN - making it suitable for next-generation ECU designs where bus-level communication is mandatory.
Availability
ST72F324BK4T3 is available at Aetrix Electronics and suitable for engine control units, body control modules, instrument clusters, and HVAC controllers requiring stable component supply across extended automotive lifecycles.
Supply support for ST72F324BK4T3 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 broad manufacturing and qualification expertise.
The ST7 family was designed specifically for cost-sensitive, high-reliability automotive applications requiring robust flash memory, deterministic real-time performance, and extended temperature operation - forming the foundation for early electronic control units before the STM8 transition.
FAQ
Does ST72F324BK4T3 support in-circuit programming (ICP)?
Yes, ST72F324BK4T3 supports in-circuit programming via the ICC interface using the dedicated ICCSEL/VPP pin. This enables field firmware updates without removing the device from the PCB, provided the target system implements the required ICC command protocol and voltage sequencing (VPP = 12.5 V during programming).
What is the maximum operating frequency achievable with the internal RC oscillator?
The internal RC oscillator operates at 8 MHz ±20% over temperature and voltage. When combined with the 2× PLL, it yields a maximum CPU clock of 16 MHz. However, the PLL requires a stable reference - it is not recommended for use with the RC oscillator alone due to jitter accumulation affecting timer accuracy and SCI baud rate stability.
Can the 10-bit ADC perform simultaneous sampling across multiple channels?
No, the ADC is single-sample successive approximation with sequential channel scanning. It does not support true simultaneous sampling. Conversion time is 13 μs per channel at fADC = 1 MHz, and channel selection is software-controlled via the ADCCSR register; no hardware scan mode or trigger synchronization between channels is implemented.
Is the ST72F324BK4T3 pin-compatible with other ST72324B variants?
Yes, all ST72324Bxx-Auto devices in LQFP44 packages - including ST72F324BK4T3, ST72F324BK6T3, and ST72F324BJ6T3 - share identical pinouts and electrical characteristics. Memory size (8/16/32 Kbyte Flash) and RAM (384/512/1024 bytes) vary by suffix, but mechanical and signal-level compatibility is maintained across the family.
ST72F324BK4T3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 32-LQFP
- Series:
- ST7
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- 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:
- 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 ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
ST72F324BK4T3 FAQ
1.How can I place an order for ST72F324BK4T3 through Aetrix?
Please submit a Request for Quotation (RFQ) for ST72F324BK4T3 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 ST72F324BK4T3 reliable?
The price and inventory of ST72F324BK4T3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST72F324BK4T3 is usually 5 days.
3.What payment methods are accepted for ST72F324BK4T3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST72F324BK4T3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ST72F324BK4T3?
ST72F324BK4T3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ST72F324BK4T3 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 ST72F324BK4T3?
For technical support, including ST72F324BK4T3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST72F324BK4T3 requirements.
6.How does Aetrix verify that ST72F324BK4T3 is sourced from the original manufacturer or authorized distributors?
All ST72F324BK4T3 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 ST72F324BK4T3 meets industry standards.
7.What is the process for return or replacement of ST72F324BK4T3?
All ST72F324BK4T3 units undergo pre-shipment inspection (PSI). If there is an issue with ST72F324BK4T3, 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 ST72F324BK4T3 part is unused and in its original packaging.
Return procedure for ST72F324BK4T3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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