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STMicroelectronics ST72F321BR9T6
- Part No.:
- ST72F321BR9T6
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 64-LQFP
- Datasheet:
-
ST72F321BR9T6.pdf
- Description:
- IC MCU 8BIT 60KB FLASH 64LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,714
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Product details
Overview
ST72F321BR9T6 from STMicroelectronics is a 64-pin LQFP 8-bit microcontroller featuring 60KB on-chip HDFlash program memory, 2KB RAM, 10-bit ADC with up to 16 input channels, five integrated timers (including PWM auto-reload and dual 16-bit timers), and three serial interfaces (SPI, SCI, I²C). It operates from 3.8V to 5.5V across –40°C to +125°C and targets automotive body control modules requiring robust real-time I/O and mixed-signal integration.
For engineers reviewing the ST72F321BR9T6 datasheet, ST72F321BR9T6 pinout, ST72F321BR9T6 application, or ST72F321BR9T6 equivalent, this MCU delivers deterministic timing via PLL-based clock multiplication, low-voltage supervision with interrupt capability, and hardware-assisted power-saving modes (Halt, Wait, Slow) for battery-sensitive embedded systems.
Technical Context
This MCU implements an enhanced ST7 core with 63 basic instructions and 17 addressing modes, supporting in-application programming (IAP) and in-circuit programming (ICP) for field firmware updates. Its clock system integrates crystal/RC oscillators, bypass mode, and a 2× PLL for stable high-frequency operation up to 24 MHz.
The peripheral set includes a nested interrupt controller with 14 vectors plus TRAP/RESET, configurable watchdog timer, main clock controller with RTC/beeper, and dedicated analog front-end with low-current coupling for noise-immune ADC sampling - all designed for deterministic response in safety-critical automotive subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | ST7 8-bit RISC CPU with 63 instructions and 17 addressing modes - enables compact firmware and predictable execution timing. |
| Program Memory | 60KB HDFlash with read-out protection and 100-cycle endurance - supports secure, field-upgradable code storage. |
| RAM Size | 2KB (2048 bytes) with 256-byte stack - sufficient for real-time task stacks and intermediate data buffering. |
| ADC Resolution | 10-bit SAR ADC with up to 16 input channels - provides precise sensor signal digitization for analog monitoring. |
| Timers | Five independent timers: 16-bit (×2), ART (PWM auto-reload), MCC/RTC, and WDG - enables concurrent PWM generation, timekeeping, and system supervision. |
| Serial Interfaces | SPI, SCI (UART-compatible), and I²C multimaster - supports sensor networks, diagnostics, and inter-ECU communication. |
| Supply Voltage | 3.8V to 5.5V operating range - compatible with automotive 5V rail and tolerant of transient load-dump conditions. |
| Temperature Range | –40°C to +125°C ambient - qualified for under-hood automotive applications per AEC-Q100 stress requirements. |
Pinout & Package
LQFP64 package (10 × 10 mm, 0.5 mm pitch) with exposed thermal pad; 64-pin configuration supports full I/O multiplexing including 48 bidirectional ports, 34 alternate function lines, and 16 high-sink outputs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply and ground | Dual power domains: VDD supplies core/peripherals; VSS provides low-impedance return path for noise-sensitive analog/digital sections. |
| OSCIN/OSCOUT | Crystal oscillator input/output | Supports external quartz (1–8 MHz) or ceramic resonator; internal RC oscillator available as fallback clock source. |
| PA0–PA7, PB0–PB7, PC0–PC7, PD0–PD7, PE0–PE7, PF0–PF7 | General-purpose I/O ports | 48 multifunctional pins with programmable pull-ups, open-drain options, and interrupt-on-change capability. |
| TLI | Top Level Interrupt input | Hardware priority override pin for critical fault handling - triggers highest-priority interrupt vector unconditionally. |
| BOOT0 | Boot mode selection | Configures reset vector location (system memory vs. user Flash) - essential for bootloader activation and recovery sequences. |
Key Features
| Feature | Design Value |
|---|---|
| In-Application Programming (IAP) | Enables firmware updates without external programmer - critical for over-the-air (OTA) reconfiguration in deployed ECUs. |
| Enhanced Low-Voltage Detector (LVD) | Monitors VDD with programmable threshold and generates interrupt before brownout - prevents erratic behavior during supply sag. |
| Four Power-Saving Modes | Halt (CPU stopped, peripherals active), Active-Halt (peripherals clock-gated), Wait (CPU clock gated), Slow (reduced frequency) - extends battery life in always-on modules. |
| Real-Time Clock & Beeper Controller | Integrated RTC with calendar/time-of-day tracking and programmable beeper output - eliminates need for external timing ICs in dashboard/audio systems. |
| Hardware Watchdog with HALT option | WDGHALT allows watchdog timeout to wake device from Halt mode - ensures fail-safe recovery without continuous CPU activity. |
Applications
| Body Control Module (BCM) | Smart Lighting Controller |
|---|---|
Use Scenario: Centralized management of door locks, window lifts, mirrors, and interior lighting in modern vehicles. IC Role / Device Role / Timing Role: Main system controller executing real-time I/O scanning, CAN message preprocessing, and PWM dimming logic. Use Value: 48 GPIOs and 16 ADC inputs enable direct connection to switches, sensors, and actuators - reducing BOM cost and PCB layer count. |
Use Scenario: Adaptive headlight leveling and dynamic LED tail-light sequencing with thermal derating. IC Role / Device Role / Timing Role: Timing-critical PWM generator with synchronized current sensing via ADC for closed-loop LED current regulation. Use Value: Dedicated ART timer delivers jitter-free 8-bit PWM at >10 kHz - meets ECE R128 photometric stability requirements. |
| Engine Bay Sensor Hub | Instrument Cluster Sub-Controller |
Use Scenario: Aggregation and preprocessing of temperature, pressure, and humidity signals near engine compartment. IC Role / Device Role / Timing Role: Signal-conditioning node with low-current-coupled ADC and SPI interface to main ECU. Use Value: –40°C to +125°C rating and LVD/AVD supervision ensure reliable operation despite thermal cycling and voltage transients. |
Use Scenario: Driving stepper motors for analog gauge needles and managing LCD backlight brightness. IC Role / Device Role / Timing Role: Real-time motion controller using MCC/RTC for smooth needle sweep and SCI for diagnostic logging. Use Value: Integrated beep generator and RTC eliminate discrete audio drivers and external clock crystals - simplifying layout and certification. |
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 |
|---|---|---|---|
| ST72F324M6T6 | Same ST7 core, 48KB Flash, 1.5KB RAM, LQFP44 package - smaller memory and I/O count. | Suitable for space-constrained modules with fewer sensors/actuators (e.g., seat control units). | Select when footprint and cost are prioritized over ADC channel count and timer flexibility. |
| STM8AF5269TAY | STM8S successor with enhanced ESD immunity, 32MHz max clock, and improved debug interface - not pin-compatible. | Required for new designs targeting AEC-Q100 Grade 1 (–40°C to +125°C) with extended lifecycle support. | Choose for long-term design-in where ST7 legacy toolchain compatibility is not mandatory. |
Compared with ST72F321BR9T6, ST72F324M6T6 reduces Flash/RAM and I/O but retains identical peripheral architecture for scaled-down implementations, while STM8AF5269TAY offers higher performance and modern qualification at the cost of software migration effort and non-interchangeable packaging.
Availability
ST72F321BR9T6 is available at Aetrix Electronics and suitable for automotive body electronics, industrial motor controls, and smart appliance subsystems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ST72F321BR9T6 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 ICs with vertical manufacturing capabilities.
The ST7 family was engineered for cost-sensitive, real-time automotive and industrial control applications - emphasizing deterministic interrupt latency, mixed-signal integration, and robustness in electrically noisy environments.
FAQ
What is the maximum operating frequency of the ST72F321BR9T6?
The ST72F321BR9T6 achieves a maximum CPU frequency of 24 MHz using its internal PLL, which multiplies the base oscillator frequency by 2×. This requires an external crystal or resonator between 1 MHz and 8 MHz, or use of the internal RC oscillator at 8 MHz (±10% tolerance) as the PLL input source.
Does the ST72F321BR9T6 support JTAG or SWD debugging?
No - the ST72F321BR9T6 uses ST's proprietary single-wire debug (SWIM) interface for programming and real-time debugging. SWIM requires only one dedicated pin (SWIM) and shares no pins with standard JTAG/SWD, enabling minimal footprint debug access without compromising I/O resources.
Can the ADC operate during low-power modes?
Yes - the 10-bit ADC remains functional in Wait and Active-Halt modes when configured for autonomous conversion triggered by timer events or external interrupts. However, it is disabled in Halt mode unless explicitly enabled via the ADC control register before entering Halt.
Is the ST72F321BR9T6 RoHS and AEC-Q100 qualified?
The ST72F321BR9T6 is RoHS-compliant and qualified to AEC-Q100 Grade 2 (–40°C to +105°C). While the datasheet specifies operation up to +125°C, full Grade 1 qualification requires validation per customer-specific test plans - consult ST's official product change notifications for latest compliance status.
ST72F321BR9T6 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
ST72F321BR9T6 FAQ
1.How can I place an order for ST72F321BR9T6 through Aetrix?
Please submit a Request for Quotation (RFQ) for ST72F321BR9T6 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 ST72F321BR9T6 reliable?
The price and inventory of ST72F321BR9T6 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST72F321BR9T6 is usually 5 days.
3.What payment methods are accepted for ST72F321BR9T6?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST72F321BR9T6 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ST72F321BR9T6?
ST72F321BR9T6 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ST72F321BR9T6 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 ST72F321BR9T6?
For technical support, including ST72F321BR9T6 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST72F321BR9T6 requirements.
6.How does Aetrix verify that ST72F321BR9T6 is sourced from the original manufacturer or authorized distributors?
All ST72F321BR9T6 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 ST72F321BR9T6 meets industry standards.
7.What is the process for return or replacement of ST72F321BR9T6?
All ST72F321BR9T6 units undergo pre-shipment inspection (PSI). If there is an issue with ST72F321BR9T6, 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 ST72F321BR9T6 part is unused and in its original packaging.
Return procedure for ST72F321BR9T6:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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