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STMicroelectronics ST72F321AR9T6TR
- Part No.:
- ST72F321AR9T6TR
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 64-LQFP
- Datasheet:
-
ST72F321AR9T6TR.pdf
- Description:
- IC MCU 8BIT 60KB FLASH 64LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,124
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Product details
Overview
ST72F321AR9T6TR from STMicroelectronics is a 64-pin LQFP 8-bit microcontroller featuring 48KB Flash/ROM, 1.5KB RAM, 10-bit ADC with 16 inputs, five timers (including PWM auto-reload and dual 16-bit), and three serial interfaces (SPI, SCI, I²C). It operates from 3.8–5.5V across –40°C to +85°C and targets industrial motor control, sensor interface modules, and embedded HMI panels.
For engineers reviewing the ST72F321AR9T6TR datasheet, ST72F321AR9T6TR pinout, ST72F321AR9T6TR application, or ST72F321AR9T6TR equivalent, this MCU delivers deterministic real-time control with nested interrupts, in-application programming, and four low-power modes-critical for battery-backed instrumentation and energy-conscious edge nodes.
Technical Context
The ST72F321AR9T6TR implements an enhanced ST7 CPU core with 63 instructions and 17 addressing modes, supporting 8×8 unsigned multiply. Its clock system integrates a PLL for 2× frequency multiplication, internal RC oscillator, crystal/ceramic resonator support, and bypass mode for external clock injection.
Interrupt handling uses a nested controller with 14 vectors plus TRAP and RESET, and includes Top Level Interrupt (TLI) on pin 64. Peripheral integration includes a Main Clock Controller with RTC/beeper, configurable watchdog, and dedicated registers for power-saving mode coordination across HALT, WAIT, Active-Halt, and SLOW states.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 8-bit ST7 CPU with 63 instructions and 17 addressing modes; enables compact firmware and predictable interrupt latency. |
| Flash Memory | 48KB HDFlash with read-out protection, 100 write cycles, 40-year data retention at 85°C-supports field firmware updates via IAP/ICP. |
| RAM Size | 1536 bytes (1.5KB) including 256-byte stack; sufficient for real-time control buffers and ISR context storage. |
| ADC Resolution | 10-bit SAR ADC with up to 16 input channels; provides ±1 LSB INL for precision analog sensing in industrial feedback loops. |
| Timers | Five independent timers: main clock controller (RTC/beeper), configurable watchdog, two 16-bit timers (input capture/output compare/PWM), and 8-bit PWM auto-reload timer with 4 outputs. |
| Serial Interfaces | SPI (master/slave), SCI (asynchronous UART), and I²C multimaster-enables concurrent communication with sensors, displays, and host controllers. |
| Supply Voltage | 3.8V to 5.5V operation with integrated low-voltage detector (LVD) and auxiliary voltage detector (AVD); ensures robustness in fluctuating industrial rails. |
Pinout & Package
LQFP64 (10 × 10 mm, 0.5 mm pitch) package with exposed thermal pad (non-electrical). Pin numbering follows standard JEDEC outline; pin 1 marked by corner notch or dot.
| 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 capacitor per pair near pins. |
| OSCIN/OSCOUT | Crystal/resonator interface | Supports 1–16 MHz crystals or ceramic resonators; internal load capacitors eliminate external caps in basic configurations. |
| RESET | Active-low reset input | Asynchronous external reset with internal pull-up; triggers full system initialization and register clearing. |
| TLI | Top Level Interrupt input | Priority-override interrupt pin (pin 64); used for emergency stop or safety-critical event signaling. |
| PA0–PA7, PB0–PB7, PC0–PC7, PD0–PD7, PE0–PE7 | Bi-directional I/O ports | 48 total I/O lines with alternate functions (timers, UART, SPI, I²C); 16 support high-sink (20 mA) for direct LED/relay drive. |
Key Features
| Feature | Design Value |
|---|---|
| In-Application Programming (IAP) | Enables firmware updates over SCI or SPI without external programmer-reduces field service time and supports remote maintenance. |
| Four Power Saving Modes | Halt (CPU off, peripherals active), Active-Halt (CPU off, selected peripherals running), Wait (CPU clock gated), Slow (reduced system clock)-extends battery life in portable diagnostics tools. |
| Nested Interrupt Controller | 14 vector priority levels with automatic context save/restore-guarantees sub-1 µs response to critical events like overcurrent detection. |
| Enhanced Low Voltage Supervisor | LVD with programmable threshold and AVD with interrupt capability-prevents erratic behavior during brown-out or auxiliary rail failure in multi-rail systems. |
| Real-Time Clock & Beeper | Integrated RTC with calendar/timekeeping and programmable beeper output-eliminates external timing ICs in HMI and alarm devices. |
Applications
| Industrial Motor Control | Sensor Interface Module |
|---|---|
Use Scenario: Closed-loop speed/torque regulation of BLDC motors in HVAC blowers and conveyor drives. IC Role / Device Role / Timing Role: Real-time execution of PID algorithms, PWM generation for gate drivers, and ADC sampling of current/voltage feedback. Use Value: Deterministic 16-bit timer resolution and 10-bit ADC linearity enable <±0.5% speed regulation accuracy under variable load. |
Use Scenario: Multi-sensor aggregation (temperature, humidity, pressure) with local preprocessing before CAN or RS-485 transmission. IC Role / Device Role / Timing Role: Sensor signal acquisition, calibration compensation, and protocol translation between analog sensors and digital buses. Use Value: Integrated 10-bit ADC with 16-channel mux and hardware averaging reduces BOM count and improves SNR in noisy factory environments. |
| Embedded HMI Panel | Battery-Powered Diagnostic Tool |
Use Scenario: Keypad-driven configuration interface with LCD backlight control and status LEDs for PLC accessories. IC Role / Device Role / Timing Role: User input scanning, display refresh timing, PWM dimming control, and non-volatile parameter storage. Use Value: 48 I/O lines with high-sink capability drive LEDs directly; RTC enables timestamped event logging without external timekeeping. |
Use Scenario: Portable oscilloscope-style tool capturing analog waveforms and decoding serial protocols in field service. IC Role / Device Role / Timing Role: High-speed ADC sampling, SPI flash buffering, and low-power sleep between measurement sessions. Use Value: WAIT and HALT modes reduce active current to <10 µA, enabling >12-month battery life on CR2032 with duty-cycled operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM8S207R8T6 | 32MHz STM8 core, 64KB Flash, 6KB RAM, enhanced debug (SWIM), no TLI pin | Higher performance and memory margin; lacks top-level interrupt pin for safety-critical edge triggering | Select when firmware complexity exceeds ST7 limits and safety certification does not require hardware TLI assertion. |
| EFM8BB52F64G-B-QFP64 | 8051-based, 64KB Flash, 4.25KB RAM, 12-bit ADC, USB interface, 2.2–3.6V supply | Lower voltage operation and USB connectivity; incompatible supply range and missing AVD/LVD dual-monitoring | Choose for USB-enabled portable tools where 3.3V system architecture is fixed and analog precision demands 12-bit resolution. |
Compared with STM8S207R8T6 and EFM8BB52F64G-B-QFP64, the ST72F321AR9T6TR offers unique LVD+AVD dual-supervision, TLI pin for hardware-level interrupt prioritization, and proven 5.5V tolerance-making it optimal for legacy industrial designs requiring robustness over raw throughput.
Availability
ST72F321AR9T6TR is available at Aetrix Electronics and suitable for industrial motor control, sensor interface modules, and embedded HMI panels requiring stable component supply through extended product lifecycles.
Supply support for ST72F321AR9T6TR 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 management ICs, and MEMS sensors for automotive, industrial, and consumer markets.
The ST7 family was engineered for cost-sensitive, real-time embedded control in harsh environments-emphasizing reliability, low-power operation, and integrated peripherals to minimize external components in industrial automation.
FAQ
What is the maximum operating frequency of the ST72F321AR9T6TR?
The ST72F321AR9T6TR achieves a maximum CPU frequency of 16 MHz using its internal PLL (2× multiplication of an 8 MHz crystal) or 8 MHz directly from an external clock source. The PLL supports stable operation up to 16 MHz across the full temperature range (–40°C to +85°C) with proper decoupling and layout adherence per AN2477 guidelines.
Does the ST72F321AR9T6TR support in-circuit programming (ICP)?
Yes, the ST72F321AR9T6TR supports ICP via the SCI interface using the STVP programming utility and compatible hardware adapters (e.g., ST-LINK/V2 with level-shifting). ICP requires VDD powered, RESET held low during entry, and TX/RX lines connected to a UART-to-USB bridge-no external HVPP voltage needed.
How many I/O pins support high-sink capability, and what is the rated current?
16 I/O pins (PA0–PA7, PB0–PB7, PC0–PC1, PD0–PD1, PE0–PE1) support high-sink operation at 20 mA per pin, with a total package limit of 100 mA. This allows direct driving of LEDs, small relays, or optocouplers without external transistors in space-constrained industrial modules.
Is the ST72F321AR9T6TR pin-compatible with other ST72321 variants?
No-ST72F321AR9T6TR uses the LQFP64 10×10 mm package (AR suffix), while ST72321R9T6 uses LQFP64 14×14 mm (R suffix) and ST72321J9T6 uses LQFP44. Pin functions differ across packages due to I/O count variation (48 vs. 32 vs. 24), and the TLI pin exists only on 64-pin variants.
ST72F321AR9T6TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 64-LQFP
- Series:
- ST7
- Packaging:
- Tape & Reel (TR)
- 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:
ST72F321AR9T6TR FAQ
1.How can I place an order for ST72F321AR9T6TR through Aetrix?
Please submit a Request for Quotation (RFQ) for ST72F321AR9T6TR 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 ST72F321AR9T6TR reliable?
The price and inventory of ST72F321AR9T6TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST72F321AR9T6TR is usually 5 days.
3.What payment methods are accepted for ST72F321AR9T6TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST72F321AR9T6TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ST72F321AR9T6TR?
ST72F321AR9T6TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ST72F321AR9T6TR 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 ST72F321AR9T6TR?
For technical support, including ST72F321AR9T6TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST72F321AR9T6TR requirements.
6.How does Aetrix verify that ST72F321AR9T6TR is sourced from the original manufacturer or authorized distributors?
All ST72F321AR9T6TR 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 ST72F321AR9T6TR meets industry standards.
7.What is the process for return or replacement of ST72F321AR9T6TR?
All ST72F321AR9T6TR units undergo pre-shipment inspection (PSI). If there is an issue with ST72F321AR9T6TR, 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 ST72F321AR9T6TR part is unused and in its original packaging.
Return procedure for ST72F321AR9T6TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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