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STMicroelectronics ST72F321BAR9T6
- Part No.:
- ST72F321BAR9T6
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 64-LQFP
- Datasheet:
-
ST72F321BAR9T6.pdf
- Description:
- IC MCU 8BIT 60KB FLASH 64LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,806
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Product details
Overview
ST72F321BAR9T6 from STMicroelectronics is a 64-pin LQFP 8-bit microcontroller featuring 60KB HDFlash program memory, 2KB 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 ST72F321BAR9T6 datasheet, ST72F321BAR9T6 pinout, ST72F321BAR9T6 application, or ST72F321BAR9T6 equivalent, this MCU delivers deterministic real-time control with nested interrupts, four low-power modes (Halt, Active-Halt, Wait, Slow), and in-application programming support - critical for field-upgradable firmware in harsh environments.
Technical Context
The ST72F321BAR9T6 integrates a 16MHz max CPU clock with PLL-based 2× frequency multiplication, enabling precise timing for motor commutation and pulse-width modulation. Its enhanced low-voltage supervisor (LVD) and auxiliary voltage detector (AVD) provide dual-threshold monitoring with interrupt capability for robust brown-out recovery.
Interrupt handling uses a nested controller with 14 vectors plus TRAP/RESET and a dedicated Top Level Interrupt (TLI) pin on 64-pin packages. The peripheral set includes a main clock controller with RTC/beeper, configurable watchdog timer, and SPI/SCI/I²C with independent clock domains and low-power mode retention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 8-bit ST7 CPU with 63 instructions and 17 addressing modes - enables compact, deterministic code for resource-constrained real-time tasks. |
| Program Memory | 60KB HDFlash with read-out protection and 100-cycle endurance - supports secure, field-upgradable firmware with 40-year data retention at 85°C. |
| RAM Size | 2048 bytes (2KB) including 256-byte stack - sufficient for multi-tasking context switching and buffered serial communication. |
| ADC Resolution | 10-bit SAR ADC with up to 16 input channels - provides sufficient dynamic range for precision analog sensing in motor current or temperature feedback loops. |
| Timers | Five independent timers: 16-bit (2×), 8-bit PWM auto-reload, main clock controller (RTC/beeper), and watchdog - enables simultaneous PWM generation, time-stamping, and system supervision. |
| Communication Interfaces | SPI, SCI (UART-compatible), and I²C multimaster - allows concurrent connectivity to sensors (I²C), displays (SPI), and host controllers (SCI) without protocol conflict. |
| Supply Range | 3.8V to 5.5V operation - compatible with standard industrial 5V rails and tolerant of supply ripple in noisy environments. |
| Temperature Range | –40°C to +125°C ambient - validated for under-hood automotive subsystems and industrial PLC edge nodes. |
Pinout & Package
LQFP64 (10 × 10 mm, 0.5 mm pitch) package with exposed thermal pad - optimized for thermal dissipation in high-duty-cycle motor control applications and compatible with standard PCB reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply and ground | Dual VDD/VSS pairs ensure stable core and I/O rail decoupling; mandatory 100nF ceramic capacitors per pair for EMI suppression. |
| OSCIN/OSCOUT | Crystal/resonator interface | Supports 1–16 MHz external crystals or ceramic resonators; internal RC oscillator available as fallback clock source. |
| TLI | Top Level Interrupt input | Dedicated non-maskable interrupt pin for emergency shutdown signals (e.g., overcurrent detection in motor drivers). |
| PA0–PA7, PB0–PB7, PC0–PC7, PD0–PD7, PE0–PE7 | Multi-function I/O ports | 48 total bidirectional pins; up to 34 support alternate functions (timers, UART, SPI, ADC); 16 support high-sink (20 mA) outputs for direct LED/relay drive. |
| BOOT0 | Boot mode selection | Configures boot vector address (system memory vs. user Flash) - essential for in-circuit programming via SCI or IAP routines. |
Key Features
| Feature | Design Value |
|---|---|
| In-Application Programming (IAP) | Enables firmware updates over SCI or I²C without external programmer - critical for remote device maintenance in deployed systems. |
| Four Power Saving Modes | Halt (CPU stopped, peripherals active), Active-Halt (peripherals clocked), Wait (all clocks gated except LSI), and Slow (reduced CPU clock) - extends battery life in portable sensor nodes. |
| Nested Interrupt Controller | 14 priority-level vectors with automatic context save/restore - guarantees sub-10 µs latency for time-critical events like encoder zero-crossing capture. |
| Enhanced Voltage Supervision | Independent LVD (main supply) and AVD (auxiliary rail) with interrupt output - enables dual-rail monitoring for isolated power domains in safety-critical designs. |
| PWM Auto-Reload Timer | 8-bit timer with 4 independent PWM outputs, 2 input captures, and event-triggered reload - supports 3-phase motor control with synchronized dead-time insertion. |
Applications
| Industrial Motor Control | Smart Sensor Node |
|---|---|
Use Scenario: Closed-loop speed/torque control of BLDC motors in HVAC blowers and conveyor drives. IC Role / Device Role / Timing Role: Real-time execution of FOC algorithms, PWM waveform generation, and ADC sampling of phase currents/voltages. Use Value: Deterministic 16-bit timer resolution and 10-bit ADC enable <1% torque ripple; 60KB Flash accommodates dual firmware images for fail-safe rollback. |
Use Scenario: Battery-powered environmental monitor aggregating temperature, humidity, and CO₂ via I²C sensors. IC Role / Device Role / Timing Role: Low-power coordinator managing sensor polling, data logging to EEPROM, and wireless transmission via SCI-connected transceiver. Use Value: Active-Halt and Slow modes reduce average current to <50 µA; integrated LVD/AVD prevents data corruption during battery sag. |
| Embedded Power Management | Automotive Body Control Module |
Use Scenario: DC-DC converter supervisory unit regulating 12V-to-5V/3.3V rails in telecom power supplies. IC Role / Device Role / Timing Role: Monitoring input/output voltages/currents, triggering soft-start sequences, and communicating fault status via SPI to master controller. Use Value: High-sink I/O pins directly drive MOSFET gates; 10-bit ADC measures rail accuracy to ±1.5% over full temperature range. |
Use Scenario: Door module controlling window lift, mirror adjustment, and interior lighting in passenger vehicles. IC Role / Device Role / Timing Role: Interface to LIN bus (via SCI), process switch inputs, drive relays/LEDs, and manage wake-up via TLI pin on intrusion detection. Use Value: –40°C to +125°C rating ensures reliability in door cavities; read-out protected Flash prevents unauthorized firmware modification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM8S208MBT6 | 16MHz STM8 core, 128KB Flash, 6KB RAM, enhanced ADC (10-bit, 21 ch), no TLI pin | Lacks dedicated TLI pin; higher Flash/RAM but no HDFlash endurance guarantee (10K cycles) | Preferred when larger code space and more ADC channels are needed, and TLI is not required for safety-critical shutdown. |
| EFM8BB52F64G-B-QFP64 | 8051-based, 50MHz, 64KB Flash, 4352B RAM, hardware CRC, USB interface | Includes USB PHY and hardware CRC engine; wider supply range (2.2–3.6V) but lower max temp (85°C) | Chosen for USB-connected diagnostics or where cryptographic checksums are mandatory, but unsuitable for under-hood use. |
Compared with STM8S208MBT6 and EFM8BB52F64G-B-QFP64, the ST72F321BAR9T6 offers superior high-temperature operation, deterministic interrupt latency, and proven HDFlash reliability - making it optimal for industrial motion control where thermal stability and field update integrity are non-negotiable.
Availability
ST72F321BAR9T6 is available at Aetrix Electronics and suitable for industrial motor control, smart sensor nodes, and embedded power management requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for ST72F321BAR9T6 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 microcontrollers, power management, and automotive ICs with vertical manufacturing capabilities.
The ST7 family was designed for cost-sensitive, high-reliability 8-bit embedded control applications demanding robustness, low power, and seamless toolchain integration - particularly in industrial automation and automotive body electronics.
FAQ
Does ST72F321BAR9T6 support in-circuit debugging?
Yes, the ST72F321BAR9T6 supports in-circuit debugging via the single-wire SWIM interface using ST's ST-LINK/V2 debugger. This enables real-time variable inspection, breakpoint setting, and flash programming without halting peripheral operation - essential for validating timing-critical motor control loops.
What is the maximum ADC sampling rate achievable?
The 10-bit ADC achieves up to 1 MSPS conversion rate when configured in fast mode with internal clock source. With external trigger synchronization (e.g., from PWM timer overflow), it supports precise periodic sampling aligned to motor commutation events - critical for current reconstruction in FOC algorithms.
Can the ST72F321BAR9T6 operate reliably at 125°C junction temperature?
Yes, the ST72F321BAR9T6 is fully characterized and guaranteed to operate from –40°C to +125°C ambient temperature. Its thermal design (LQFP64 with exposed pad) and internal LVD/AVD supervision ensure functional safety and Flash data integrity even under sustained high-temperature conditions typical in engine bay or industrial enclosures.
Is there hardware support for bootloader development?
Yes, the ST72F321BAR9T6 includes dedicated BOOT0 pin and system memory bootloader accessible via SCI or I²C. This factory-programmed ROM supports UART-based firmware updates without external programming hardware - enabling secure, field-deployable OTA-like upgrades with checksum validation.
ST72F321BAR9T6 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 64-LQFP
- Series:
- ST7
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Verified
- Core Processor:
- ST7
- Core Size:
- 8-Bit
- Speed:
- 8MHz
- Connectivity:
- I2C, SCI, SPI
- Peripherals:
- LVD, POR, PWM, WDT
- Number of I/O:
- 48
- Program Memory Size:
- 60KB (60K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 2K 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:
ST72F321BAR9T6 FAQ
1.How can I place an order for ST72F321BAR9T6 through Aetrix?
Please submit a Request for Quotation (RFQ) for ST72F321BAR9T6 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 ST72F321BAR9T6 reliable?
The price and inventory of ST72F321BAR9T6 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST72F321BAR9T6 is usually 5 days.
3.What payment methods are accepted for ST72F321BAR9T6?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST72F321BAR9T6 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ST72F321BAR9T6?
ST72F321BAR9T6 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ST72F321BAR9T6 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 ST72F321BAR9T6?
For technical support, including ST72F321BAR9T6 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST72F321BAR9T6 requirements.
6.How does Aetrix verify that ST72F321BAR9T6 is sourced from the original manufacturer or authorized distributors?
All ST72F321BAR9T6 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 ST72F321BAR9T6 meets industry standards.
7.What is the process for return or replacement of ST72F321BAR9T6?
All ST72F321BAR9T6 units undergo pre-shipment inspection (PSI). If there is an issue with ST72F321BAR9T6, 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 ST72F321BAR9T6 part is unused and in its original packaging.
Return procedure for ST72F321BAR9T6:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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