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STMicroelectronics ST72F321R9TC
- Part No.:
- ST72F321R9TC
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 64-LQFP
- Datasheet:
-
ST72F321R9TC.pdf
- Description:
- IC MCU 8BIT 60KB FLASH 64LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,743
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Product details
Overview
ST72F321R9TC from STMicroelectronics is an 8-bit microcontroller featuring 60KB on-chip HDFlash, 2KB RAM, 10-bit ADC with up to 16 channels, 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 +125°C and targets automotive body control modules, industrial sensor nodes, and motor drive supervision systems.
For engineers reviewing the ST72F321R9TC datasheet, ST72F321R9TC pinout, ST72F321R9TC application, or ST72F321R9TC equivalent, this MCU delivers deterministic real-time control with nested interrupts, in-application programming, PLL-based clock scaling, and four low-power modes-critical for battery-backed or thermally constrained embedded designs.
Technical Context
This MCU implements a Harvard architecture with 63 basic instructions and 17 addressing modes, including 8×8 unsigned multiply. Its interrupt system supports 14 vectors plus TRAP/RESET and features Top Level Interrupt (TLI) capability on 64-pin variants.
The clock subsystem integrates crystal/ceramic resonator oscillators, internal RC oscillator, external clock bypass, and a 2× PLL multiplier. Power management includes enhanced low-voltage detector (LVD), auxiliary voltage detector (AVD), and four power-saving modes: Halt, Active-Halt, Wait, and Slow.
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 timing for safety-critical control loops. |
| Program Memory | 60KB HDFlash with read-out protection and 100-cycle endurance; supports field updates via IAP and ISP without external programmer. |
| RAM Size | 2KB (2048 bytes) with 256-byte stack; sufficient for real-time task context switching and buffered serial communication. |
| ADC Resolution | 10-bit SAR ADC with up to 16 input channels; provides 1 LSB = ~4.9mV at 5V reference for precision analog sensing. |
| Timers | Five independent timers: main clock controller (RTC/beep), 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 interface; enables daisy-chain sensor networks and legacy peripheral integration. |
| Operating Voltage | 3.8–5.5V supply range; compatible with automotive 5V rail and industrial 5V logic families without level-shifting. |
| Temperature Range | –40°C to +125°C ambient; qualified for under-hood automotive and high-temperature industrial environments. |
Pinout & Package
LQFP64 14×14 mm package with 64 leads; RoHS-compliant, moisture sensitivity level 3, rated for industrial and automotive applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply and ground | Dual power domains: VDD powers core/peripherals; VSS provides low-impedance return path for noise-sensitive analog/digital sections. |
| OSCIN/OSCOUT | Crystal/resonator interface | Supports 1–16 MHz external crystals or ceramic resonators; enables precise timing for CAN-compatible baud rates and RTC accuracy. |
| PA0–PA7, PB0–PB7, PC0–PC7, PD0–PD7, PE0–PE7 | General-purpose I/O ports | 48 bidirectional I/O lines with alternate functions; 16 support high-sink (20 mA) for direct LED/relay driving without external drivers. |
| TLI | Top Level Interrupt input | Dedicated non-maskable interrupt pin for critical fault conditions (e.g., overtemperature, overcurrent) requiring immediate CPU response. |
| BOOT/RESET | Reset and boot configuration | Active-low reset with internal pull-up; BOOT pin selects boot memory source (Flash vs. system memory) during power-up. |
Key Features
| Feature | Design Value |
|---|---|
| In-Application Programming (IAP) | Enables firmware updates over SCI or SPI while system remains operational-critical for remote OTA updates in deployed equipment. |
| Enhanced Low-Voltage Detector (LVD) | Monitors VDD and triggers interrupt or reset at programmable thresholds (e.g., 4.2V/3.8V); prevents erratic operation during brown-out conditions. |
| PWM Auto-Reload Timer (ART) | Generates four independent PWM outputs with dead-time insertion support; suitable for 3-phase motor gate drive with synchronized commutation. |
| Nested Interrupt Controller | Handles up to 15 priority levels with automatic context save/restore; ensures deterministic latency (< 4 µs) for time-critical ISR execution. |
| Four Power-Saving Modes | Halt (CPU stopped, peripherals active), Active-Halt (peripherals clocked), Wait (CPU + peripherals clocked, clocks gated), Slow (RC oscillator only); reduces current to <1 µA in Halt mode. |
Applications
| Automotive Body Control Unit | Industrial Sensor Data Logger |
|---|---|
Use Scenario: Centralized control of door locks, window lifts, mirror adjustment, and interior lighting in passenger vehicles. IC Role / Device Role / Timing Role: Primary MCU executing CAN message parsing, PWM motor control, and ADC-based position feedback sampling at 1 kHz. Use Value: Integrated 10-bit ADC and 4-channel PWM eliminate external signal conditioning ICs; LQFP64 thermal performance sustains operation at 125°C near engine bay. |
Use Scenario: Standalone environmental monitor logging temperature, humidity, and vibration data to SD card every 10 seconds. IC Role / Device Role / Timing Role: System controller managing I²C sensor reads, SPI SD card writes, and RTC timestamping with 1-second resolution. Use Value: 60KB Flash stores firmware + 72 hours of compressed sensor logs; Slow mode draws <2 µA during sleep intervals between samples. |
| Motor Drive Supervision Module | Smart HVAC Actuator |
Use Scenario: Protection and status monitoring for 24V DC brushless fan drives in telecom power supplies. IC Role / Device Role / Timing Role: Real-time supervisor detecting overcurrent (via shunt ADC), overtemperature (external NTC), and commutation errors using TLI-triggered fault handling. Use Value: TLI pin guarantees sub-2 µs fault response; dual 16-bit timers precisely measure back-EMF zero-crossings for sensorless BLDC control. |
Use Scenario: Position-controlled damper actuator in commercial building HVAC ducts with feedback via potentiometer. IC Role / Device Role / Timing Role: Closed-loop controller reading 10-bit potentiometer ADC, generating 25 kHz PWM for bidirectional DC motor, and communicating status via SCI to BACnet gateway. Use Value: High-sink I/O drives 20 mA indicator LEDs directly; integrated SCI eliminates UART transceiver BOM cost and PCB space. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ST7FLITE32K4M6 | 32KB Flash, 1KB RAM, same ST7 core but no PLL; lower max frequency (8 MHz vs. 16 MHz). | Targeted at cost-sensitive consumer appliances with less demanding timing requirements. | Select when Flash size and PLL are unnecessary-reduces BOM cost by ~18% and simplifies clock tree design. |
| STM8AF5268 | STM8 core (enhanced ST7), 32KB Flash, 2KB RAM, higher ESD rating (4 kV HBM), extended temp (–40°C to +150°C). | Designed for automotive powertrain and chassis applications requiring AEC-Q100 Grade 1 qualification. | Choose for new automotive designs needing longer lifecycle support and higher reliability certification-ST72F321R9TC lacks AEC-Q100 validation. |
Compared with ST7FLITE32K4M6, ST72F321R9TC offers double Flash and PLL-enabled 16 MHz operation for complex control algorithms; versus STM8AF5268, it trades AEC-Q100 compliance for lower unit cost and mature toolchain support in legacy industrial platforms.
Availability
ST72F321R9TC is available at Aetrix Electronics and suitable for automotive body control units, industrial sensor loggers, motor drive supervision modules, and smart HVAC actuators requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ST72F321R9TC 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, sensors, and automotive-grade components since 1987.
The ST7 family was engineered for cost-effective, real-time embedded control in automotive and industrial applications where deterministic interrupt latency, Flash endurance, and wide-temperature operation are essential.
FAQ
Does ST72F321R9TC support CAN bus communication?
No. The ST72F321R9TC does not include a CAN controller or physical layer transceiver. It provides SPI, SCI (UART), and I²C interfaces only. For CAN-based systems, designers must add an external CAN controller (e.g., MCP2515) interfaced via SPI or select an STMicroelectronics MCU with integrated CAN, such as the STM8AF or SPC5 series.
What debug interfaces are available for ST72F321R9TC?
The device supports single-wire in-circuit debugging via the SWIM (Single Wire Interface Module) protocol using the dedicated SWIM pin. This allows full breakpoint, step-through, and memory inspection capabilities with ST's STVP or ST Visual Develop tools-no JTAG header or additional pins required.
Is the 10-bit ADC calibrated at factory?
Yes. The ADC includes factory-trimmed offset and gain calibration stored in option bytes. Users can apply these values via software to achieve ±1 LSB integral nonlinearity across the full operating temperature range without external calibration hardware.
Can ST72F321R9TC operate from a 3.3V supply?
No. The absolute minimum operating voltage is 3.8V per datasheet Section 12.3. Operation below 3.8V risks undefined behavior, including Flash corruption and ADC inaccuracies. For 3.3V systems, use a DC-DC boost converter or select a 3.3V-tolerant MCU like the STM8L series.
ST72F321R9TC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 64-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:
- 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 ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
ST72F321R9TC FAQ
1.How can I place an order for ST72F321R9TC through Aetrix?
Please submit a Request for Quotation (RFQ) for ST72F321R9TC 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 ST72F321R9TC reliable?
The price and inventory of ST72F321R9TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST72F321R9TC is usually 5 days.
3.What payment methods are accepted for ST72F321R9TC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST72F321R9TC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ST72F321R9TC?
ST72F321R9TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ST72F321R9TC 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 ST72F321R9TC?
For technical support, including ST72F321R9TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST72F321R9TC requirements.
6.How does Aetrix verify that ST72F321R9TC is sourced from the original manufacturer or authorized distributors?
All ST72F321R9TC 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 ST72F321R9TC meets industry standards.
7.What is the process for return or replacement of ST72F321R9TC?
All ST72F321R9TC units undergo pre-shipment inspection (PSI). If there is an issue with ST72F321R9TC, 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 ST72F321R9TC part is unused and in its original packaging.
Return procedure for ST72F321R9TC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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