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STMicroelectronics ST72F321BJ6T6
- Part No.:
- ST72F321BJ6T6
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 44-LQFP
- Datasheet:
-
ST72F321BJ6T6.pdf
- Description:
- IC MCU 8BIT 32KB FLASH 44LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,800
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Product details
Overview
ST72F321BJ6T6 from STMicroelectronics is a 44-pin LQFP 8-bit microcontroller featuring 32KB Flash/ROM, 1KB RAM, 10-bit ADC with up to 16 inputs, five timers (including PWM auto-reload and dual 16-bit), and three serial interfaces (SPI, SCI, I²C). It operates from 3.8V to 5.5V across –40°C to +125°C and targets industrial motor control, sensor interface modules, and embedded power management systems.
For engineers reviewing the ST72F321BJ6T6 datasheet, ST72F321BJ6T6 pinout, ST72F321BJ6T6 application, or ST72F321BJ6T6 equivalent, this MCU delivers deterministic real-time control with nested interrupts, four low-power modes (Halt, Active-Halt, Wait, Slow), in-application programming capability, and robust analog integration for cost-sensitive 8-bit designs requiring extended temperature operation.
Technical Context
The ST72F321BJ6T6 implements the ST7 core with 63 basic instructions and 17 addressing modes, supporting 8×8 unsigned multiply. Its clock system integrates an internal RC oscillator, crystal/ceramic resonator support, external clock bypass, and a 2× PLL for frequency multiplication - enabling flexible timing configuration without external components.
Interrupt handling uses a nested controller with 14 vectors plus TRAP and RESET, and supports Top Level Interrupt (TLI) on 64-pin variants (not applicable here). The device provides 32 multifunctional bidirectional I/O lines, 22 alternate function lines, and 12 high-sink outputs - all configurable under four power-saving modes with wake-up via external interrupt or peripheral event.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | ST7 8-bit CISC CPU with 63 instructions and 17 addressing modes - enables compact firmware and predictable interrupt latency. |
| Flash Memory | 32KB HDFlash with read-out protection and 100-cycle endurance - supports field updates via IAP/ICP without erasing full memory. |
| RAM Size | 1024 bytes (1KB) with 256-byte stack - sufficient for real-time control tasks with multiple peripheral buffers. |
| ADC Resolution | 10-bit successive approximation ADC with up to 16 input channels - provides precise sensor signal digitization in noisy industrial environments. |
| Timers | Five independent timers: main clock controller (RTC/beep/clock-out), configurable watchdog, two 16-bit timers (input capture/output compare/PWM), and 8-bit PWM auto-reload timer with 4 outputs - enables multi-channel motor timing and pulse generation. |
| Serial Interfaces | SPI (master/slave), SCI (asynchronous UART), and I²C (multimaster) - allows concurrent communication with sensors, displays, and host controllers using standard protocols. |
| Operating Voltage | 3.8V to 5.5V - compatible with legacy 5V logic and tolerant of supply ripple in industrial power rails. |
| Temperature Range | –40°C to +125°C - qualified for under-hood automotive subsystems and industrial PLC edge nodes. |
Pinout & Package
LQFP44 10 × 10 mm package with exposed pad (JEDEC MO-220 variant), 0.8 mm pitch, and thermal performance suitable for convection-cooled industrial PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply and ground | Dual power domains: VDD powers core/peripherals; VSS is common reference - requires local decoupling per datasheet layout guidelines. |
| OSCIN, OSCOUT | Crystal/resonator interface | Connects to external 1–8 MHz crystal or ceramic resonator; internal oscillator circuitry eliminates need for external capacitors in some configurations. |
| PA0–PA7, PB0–PB7, PC0–PC7, PD0–PD7 | General-purpose I/O ports | 32 total bidirectional pins with alternate functions (timers, UART, SPI, I²C); 12 support high-sink (20 mA) for direct LED/relay drive. |
| ADC0–ADC15 | Analog input multiplexer channels | Up to 16 dedicated or shared pins for 10-bit ADC sampling - supports single-ended or differential acquisition with programmable sampling time. |
| RESET | Active-low reset input | Asynchronous external reset with internal LVD/AVD supervision - ensures reliable startup and brownout recovery without external supervisor IC. |
Key Features
| Feature | Design Value |
|---|---|
| In-Application Programming (IAP) | Enables firmware updates over SCI or SPI without removing MCU from board - critical for remote field maintenance. |
| Enhanced Low-Voltage Detector (LVD) | Programmable threshold with interrupt capability - prevents erratic operation during supply sag and triggers controlled shutdown or safe state entry. |
| Four Power-Saving Modes | Halt (CPU stopped, peripherals active), Active-Halt (CPU halted, clocks running), Wait (all clocks gated except LSI), Slow (reduced system clock) - extends battery life in portable instrumentation. |
| Nested Interrupt Controller | 14 priority-level vectors with automatic context save/restore - guarantees deterministic response to time-critical events like encoder pulses or fault signals. |
| Hardware Watchdog Timer | Configurable timeout with windowed mode option - detects software lockup and forces safe reset without external component. |
Applications
| Industrial Motor Control | Sensor Interface Module |
|---|---|
Use Scenario: Closed-loop speed regulation of BLDC fans in HVAC systems using hall-effect feedback and PWM-driven gate drivers. IC Role / Device Role / Timing Role: Real-time execution of commutation logic, ADC sampling of current/voltage, and generation of synchronized 3-phase PWM signals. Use Value: Integrated 16-bit timers with input capture and output compare eliminate external timing ICs; 10-bit ADC resolves torque ripple below 0.5% FS. |
Use Scenario: Multi-sensor data aggregation (temperature, humidity, pressure) in smart building nodes with RS-485 backhaul. IC Role / Device Role / Timing Role: Sensor signal conditioning, I²C master for digital sensors, SCI-to-RS485 translation, and low-power sleep/wake scheduling. Use Value: Single-chip solution reduces BOM count by 3 components; –40°C to +125°C rating ensures reliability in unconditioned ceiling cavities. |
| Embedded Power Management | Automotive Body Control Unit |
Use Scenario: DC-DC converter supervision in telecom power supplies, monitoring output voltage/current and adjusting feedback loop via DAC (via GPIO PWM filtering). IC Role / Device Role / Timing Role: Analog monitoring front-end, SPI master for digital PMBus-compatible controllers, and fault-logging via nonvolatile Flash. Use Value: 32KB Flash stores calibration tables and event logs; LVD/AVD dual supervision prevents false trips during load transients. |
Use Scenario: Door module controlling window lift, mirror adjustment, and interior lighting with LIN bus communication. IC Role / Device Role / Timing Role: LIN physical layer interface (SCI with baud rate generator), PWM dimming control, and wake-on-LIN functionality. Use Value: 125°C rating supports placement near door latch actuators; high-sink I/O drives 20mA LEDs directly without external drivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM8S003F3P6 | STM8 core, 8KB Flash, 1KB RAM, no hardware I²C, single 16-bit timer, 10-bit ADC with 5 channels | Lacks multimaster I²C and second 16-bit timer - unsuitable for dual-sensor I²C buses or complex PWM phase alignment | Select when cost sensitivity outweighs peripheral count and extended temperature is not required (–40°C to +85°C only). |
| EFM8BB10F8G-A-QFN20 | Silicon Labs 8051 core, 8KB Flash, 512B RAM, 12-bit ADC (8 ch), 3x 16-bit timers, no native SCI but UART+LIN-capable | Higher ADC resolution but fewer I/O (20-pin QFN) and no integrated LVD/AVD - requires external supervisor for brownout detection | Prefer for precision analog sensing where 12-bit resolution matters more than industrial temp range or integrated power monitoring. |
Compared with STM8S003F3P6 and EFM8BB10F8G-A-QFN20, the ST72F321BJ6T6 uniquely combines extended temperature operation, multimaster I²C, dual 16-bit timers, and integrated voltage supervision - making it optimal for space-constrained industrial controls needing guaranteed reliability at 125°C.
Availability
ST72F321BJ6T6 is available at Aetrix Electronics and suitable for industrial motor control, sensor interface modules, embedded power management, and automotive body electronics requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ST72F321BJ6T6 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 industrial, automotive, and consumer markets.
The ST7 family was engineered for cost-effective, high-integration 8-bit control in harsh environments - emphasizing robustness, low-power operation, and peripheral richness without external support components.
FAQ
Does ST72F321BJ6T6 support in-circuit programming (ICP) via standard interfaces?
Yes, the ST72F321BJ6T6 supports ICP through its built-in SCI interface using the STVP (ST Visual Programmer) tool and compatible debug adapters. No external programming hardware is required beyond a UART-to-USB bridge, and the process preserves user code and configuration bits without full chip erase.
What is the maximum ADC sampling rate achievable with ST72F321BJ6T6?
The 10-bit ADC achieves up to 1 MSPS conversion rate when configured for single-shot mode with minimal sampling time and internal clock source. Actual throughput depends on prescaler settings and channel count; continuous scan of 16 channels yields ~50 kSPS aggregate rate with 10-bit accuracy maintained.
Can the ST72F321BJ6T6 generate complementary PWM outputs with dead-time insertion?
No, the ST72F321BJ6T6 does not include hardware dead-time insertion or complementary PWM channel pairing. Its 8-bit PWM auto-reload timer supports four independent outputs, but synchronization and dead-time must be implemented in firmware using timer interrupts and GPIO toggling with precise cycle counting.
Is there hardware support for LIN bus communication on ST72F321BJ6T6?
The ST72F321BJ6T6 lacks dedicated LIN physical layer hardware, but its SCI module can emulate LIN 2.1 protocol via software-controlled baud rate generation and break detection. Application notes AN2679 and AN2777 detail implementation using SCI asynchronous mode with timer-assisted sync field timing.
ST72F321BJ6T6 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 44-LQFP
- Series:
- ST7
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- ST7
- Core Size:
- 8-Bit
- Speed:
- 8MHz
- Connectivity:
- I2C, SCI, SPI
- Peripherals:
- LVD, POR, PWM, WDT
- Number of I/O:
- 32
- Program Memory Size:
- 32KB (32K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 1K x 8
- Voltage - Supply (Vcc/Vdd):
- 3.8V ~ 5.5V
- Data Converters:
- A/D 16x10b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
ST72F321BJ6T6 FAQ
1.How can I place an order for ST72F321BJ6T6 through Aetrix?
Please submit a Request for Quotation (RFQ) for ST72F321BJ6T6 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 ST72F321BJ6T6 reliable?
The price and inventory of ST72F321BJ6T6 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST72F321BJ6T6 is usually 5 days.
3.What payment methods are accepted for ST72F321BJ6T6?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST72F321BJ6T6 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ST72F321BJ6T6?
ST72F321BJ6T6 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ST72F321BJ6T6 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 ST72F321BJ6T6?
For technical support, including ST72F321BJ6T6 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST72F321BJ6T6 requirements.
6.How does Aetrix verify that ST72F321BJ6T6 is sourced from the original manufacturer or authorized distributors?
All ST72F321BJ6T6 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 ST72F321BJ6T6 meets industry standards.
7.What is the process for return or replacement of ST72F321BJ6T6?
All ST72F321BJ6T6 units undergo pre-shipment inspection (PSI). If there is an issue with ST72F321BJ6T6, 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 ST72F321BJ6T6 part is unused and in its original packaging.
Return procedure for ST72F321BJ6T6:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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