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STMicroelectronics ST72F324BK4T6TR
- Part No.:
- ST72F324BK4T6TR
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 32-LQFP
- Datasheet:
-
ST72F324BK4T6TR.pdf
- Description:
- IC MCU 8BIT 16KB FLASH 32LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,702
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Product details
Overview
ST72F324BK4T6TR 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 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 ST72F324BK4T6TR datasheet, ST72F324BK4T6TR pinout, ST72F324BK4T6TR application, or ST72F324BK4T6TR equivalent, this MCU delivers deterministic real-time control with nested interrupt handling, in-application programming support, low-voltage supervision with AVD interrupt capability, and four power-saving modes optimized for automotive battery-constrained environments.
Technical Context
The ST72F324BK4T6TR implements the ST7 core architecture with 63 basic instructions and 17 addressing modes, including 8×8 unsigned multiply. Its clock system integrates a programmable PLL for 2× frequency multiplication, internal RC oscillator, crystal/ceramic resonator support, and external clock input - enabling flexible timing configuration for CAN-adjacent subsystems and sensor fusion nodes.
Interrupt management uses a nested controller with 10 vectors plus TRAP and RESET, supporting 9 external interrupt lines mapped across 4 vectors. The peripheral set includes two independent 16-bit timers with input capture, output compare, PWM, and pulse generation modes - each configurable for high-precision timing in motor commutation or ignition sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | ST7 8-bit CISC CPU with 63 instructions and 17 addressing modes |
| Flash Memory | 16 Kbyte HDFlash with readout protection, 100-program cycle endurance, 20-year data retention |
| RAM | 512 bytes (256-byte stack), sufficient for real-time task context switching in automotive firmware |
| ADC Resolution | 10-bit successive approximation ADC with up to 12 analog inputs, ±1 LSB INL for sensor signal digitization |
| Timers | Dual 16-bit timers: Timer A (1 input capture, 1 output compare) and Timer B (2 input captures, 2 output compares) |
| Communication | SPI master/slave interface and asynchronous SCI (UART-compatible) with framing and parity support |
| Operating Voltage | 3.8 V to 5.5 V supply range, compatible with automotive 5 V bus and brown-out tolerant design |
| Temperature Range | –40°C to +125°C ambient, qualified per AEC-Q100 Grade 2 for under-hood applications |
Pinout & Package
LQFP44 package (10 mm × 10 mm, 0.8 mm pitch) with exposed thermal pad; 44-pin quad flat pack suitable for automated SMT assembly and thermally demanding automotive PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply and ground | Dual power domains: VDD powers digital logic and I/O; VSS is common reference for all analog/digital circuits |
| OSCIN/OSCOUT | Crystal oscillator input/output | Supports 1–8 MHz quartz or ceramic resonator; enables precise timing for engine RPM measurement |
| RESET | Asynchronous reset input | Active-low, Schmitt-triggered input with internal pull-up; initiates full hardware reset on power-up or fault recovery |
| PA0–PA7 | Port A bidirectional I/O | 8-bit port with alternate functions including ADC inputs, timer channels, and SCI signals |
| PB0–PB7 | Port B bidirectional I/O | 8-bit port supporting SPI, timer outputs, and high-sink capability (up to 20 mA per pin) |
| PC0–PC7 | Port C bidirectional I/O | 8-bit port with SCI TX/RX, watchdog control, and LVD/AVD monitoring pins |
| PD0–PD7 | Port D bidirectional I/O | 8-bit port with timer A/B channels, SPI signals, and external interrupt sources |
| AVREF/AVSS | Analog reference and ground | Separate analog supply domain for ADC accuracy; decoupling required for <1 LSB noise performance |
Key Features
| Feature | Design Value |
|---|---|
| In-application programming (IAP) | Enables field firmware updates without external programmer via embedded bootloader using SCI or SPI |
| Enhanced low-voltage detector (LVD) | Programmable reset threshold with hysteresis; prevents erratic operation during battery sag below 3.8 V |
| Auxiliary voltage detector (AVD) | Monitors auxiliary rail (e.g., sensor supply) and triggers interrupt on undervoltage - critical for fail-safe diagnostics |
| Four power-saving modes | Slow, Wait, Active Halt, and Halt modes reduce current to <1 µA in Halt, extending battery life in always-on modules |
| Nested interrupt controller | Supports prioritized, reentrant ISR execution with automatic context save/restore - essential for time-critical engine control loops |
| Real-time clock & beeper (MCC/RTC) | Integrated RTC timer with programmable prescaler and beeper driver for audible alerts in dashboard HMI |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
Use Scenario: Real-time sampling of crankshaft position, throttle angle, and coolant temperature for spark timing calculation. IC Role / Device Role / Timing Role: Primary control MCU executing closed-loop combustion algorithms at ≤10 ms loop intervals with deterministic interrupt latency. Use Value: 16-bit timers with input capture provide sub-degree crankshaft angular resolution; 10-bit ADC ensures ±1°C coolant temperature accuracy. |
Use Scenario: Managing door lock actuators, window lift motors, and interior lighting based on CAN message reception and local sensor inputs. IC Role / Device Role / Timing Role: Local decision node coordinating actuator sequencing and power distribution via high-sink I/O ports. Use Value: 12 high-sink outputs (20 mA each) drive relays and solenoids directly; SCI interface enables diagnostic communication over vehicle service port. |
| Instrument Cluster Display | Heating/Ventilation Control |
Use Scenario: Driving analog gauges and LED indicators while rendering speed, RPM, and warning icons via multiplexed display drivers. IC Role / Device Role / Timing Role: Human-machine interface controller synchronizing visual feedback with vehicle bus data and local button presses. Use Value: MCC/RTC module generates precise 1 Hz tick for odometer accumulation; SPI interface connects to external LCD controller IC. |
Use Scenario: Regulating blower motor speed, blend door position, and cabin temperature using PWM outputs and thermistor readings. IC Role / Device Role / Timing Role: Dedicated climate subsystem controller performing PID calculations and actuator modulation. Use Value: Dual 16-bit timers generate synchronized PWM waveforms for fan speed control; 12-channel ADC monitors multiple NTC thermistors simultaneously. |
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 |
|---|---|---|---|
| ST72F324BJ4T6TR | LQFP44 package (vs. LQFP32 for BK4); adds 8 additional I/O pins and 2 extra ADC channels | Better suited for designs requiring >24 I/O or >10 ADC inputs, e.g., multi-sensor HVAC modules | Select BJ4 when board layout allows larger footprint and higher peripheral count is needed |
| STM8AF5269TAY | STM8 core, 32 Kbyte Flash, enhanced ESD/EMC robustness, integrated CAN transceiver support | Designed for CAN-based powertrain networks; lacks native SCI but offers LIN physical layer compliance | Choose STM8AF5269TAY for new CAN-centric designs where protocol stack integration reduces BOM cost |
Compared with ST72F324BK4T6TR, the BJ4 variant expands I/O and ADC resources in the same LQFP44 form factor, while the STM8AF5269TAY shifts toward modern CAN/LIN ecosystems with stronger automotive qualification - making BK4 optimal for cost-sensitive, non-CAN body electronics where legacy ST7 toolchain compatibility is required.
Availability
ST72F324BK4T6TR 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 ST72F324BK4T6TR 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 with vertical manufacturing capabilities.
The ST7 family was engineered specifically for cost-sensitive, high-reliability automotive applications requiring deterministic real-time response, extended temperature operation, and robust EMC performance in harsh electrical environments.
FAQ
Is ST72F324BK4T6TR pin-compatible with other ST72324B variants?
No - ST72F324BK4T6TR uses the LQFP32 package (7 mm × 7 mm), while ST72F324BJ4T6TR uses LQFP44. Pin counts, I/O assignments, and power/ground pin locations differ between packages. Migration requires PCB redesign and firmware register mapping verification, especially for Port D and AVREF connections.
Does ST72F324BK4T6TR support CAN bus communication?
No - the ST72F324BK4T6TR does not integrate a CAN controller or physical layer transceiver. It provides SCI (UART) and SPI interfaces only. For CAN connectivity, external CAN controller ICs (e.g., MCP2515) must be interfaced via SPI, with level-shifting and isolated transceivers added externally.
What is the maximum ADC sampling rate achievable on ST72F324BK4T6TR?
The 10-bit ADC achieves up to 100 kSPS maximum conversion rate under typical conditions (VDD = 5 V, fCPU = 8 MHz). Conversion time is 13 µs per sample, limited by internal RC clock source and acquisition timing; actual throughput depends on channel scanning sequence and software overhead in interrupt service routines.
Can ST72F324BK4T6TR operate reliably at 125°C junction temperature?
Yes - the device is qualified for ambient temperatures up to +125°C (AEC-Q100 Grade 2) and supports continuous operation at that rating when PCB thermal design maintains junction temperature ≤150°C. Required measures include copper pour under thermal pad, ≥2 oz copper layers, and minimal power dissipation (<150 mW typical in active mode).
ST72F324BK4T6TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 32-LQFP
- Series:
- ST7
- Packaging:
- Tape & Reel (TR)
- 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
ST72F324BK4T6TR FAQ
1.How can I place an order for ST72F324BK4T6TR through Aetrix?
Please submit a Request for Quotation (RFQ) for ST72F324BK4T6TR 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 ST72F324BK4T6TR reliable?
The price and inventory of ST72F324BK4T6TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST72F324BK4T6TR is usually 5 days.
3.What payment methods are accepted for ST72F324BK4T6TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST72F324BK4T6TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ST72F324BK4T6TR?
ST72F324BK4T6TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ST72F324BK4T6TR 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 ST72F324BK4T6TR?
For technical support, including ST72F324BK4T6TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST72F324BK4T6TR requirements.
6.How does Aetrix verify that ST72F324BK4T6TR is sourced from the original manufacturer or authorized distributors?
All ST72F324BK4T6TR 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 ST72F324BK4T6TR meets industry standards.
7.What is the process for return or replacement of ST72F324BK4T6TR?
All ST72F324BK4T6TR units undergo pre-shipment inspection (PSI). If there is an issue with ST72F324BK4T6TR, 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 ST72F324BK4T6TR part is unused and in its original packaging.
Return procedure for ST72F324BK4T6TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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