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STMicroelectronics ST72F321BJ7T6TR
- Part No.:
- ST72F321BJ7T6TR
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 44-LQFP
- Datasheet:
-
ST72F321BJ7T6TR.pdf
- Description:
- IC MCU 8BIT 48KB FLASH 44LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,645
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Product details
Overview
ST72F321BJ7T6TR from STMicroelectronics is a 44-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 SPI/SCI/I²C interfaces. 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 low-power operation.
For engineers reviewing the ST72F321BJ7T6TR datasheet, ST72F321BJ7T6TR pinout, ST72F321BJ7T6TR application, or ST72F321BJ7T6TR equivalent, this MCU delivers deterministic interrupt latency (1–3 cycles), configurable watchdog with halt-mode support, and dual-oscillator clock management for fail-safe timing in safety-critical embedded systems.
Technical Context
The ST72F321BJ7T6TR implements the 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 nested interrupt controller handles 14 vectors plus TRAP and RESET, with top-level interrupt (TLI) capability on 64-pin variants - not available on this 44-pin variant.
Power management includes four low-power modes (Halt, Active-Halt, Wait, Slow), enhanced low-voltage detector (LVD) with interrupt, auxiliary voltage detector (AVD), and PLL-based 2× frequency multiplication. The 10-bit ADC supports up to 16 input channels with low-current coupling for noise-sensitive analog acquisition.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | ST7 8-bit RISC CPU with 63 instructions and 17 addressing modes for compact, deterministic code execution. |
| Flash Memory | 48KB HDFlash with read-out protection, 100-program/erase cycles, 40-year data retention at 85°C. |
| RAM Size | 1.5KB (1536 bytes) including 256-byte stack space for nested interrupt handling. |
| ADC Resolution | 10-bit successive approximation ADC with up to 16 input channels and low-current coupling for reduced noise injection. |
| 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. |
| Communication Interfaces | SPI (master/slave), SCI (asynchronous UART), and I²C multimaster interface - all independently clocked and interrupt-capable. |
| Supply Voltage | 3.8V to 5.5V operating range with integrated LVD and AVD for supply monitoring and system fault response. |
Pinout & Package
LQFP44 (10 × 10 mm, 0.8 mm pitch) package with 44 leads. Pin functions validated per STMicroelectronics datasheet Rev 5 (October 2008), Table 1 and Section 2 "Pin Description".
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply and ground | Dual power domains: VDD powers core/peripherals; VSS provides reference return path for analog/digital sections. |
| OSCIN/OSCOUT | Crystal/resonator interface | Supports external crystal (1–8 MHz) or ceramic resonator; internal RC oscillator usable as fallback clock source. |
| RESET | Asynchronous reset input | Active-low, Schmitt-triggered input enabling hardware reset initiation independent of clock state. |
| PA0–PA7, PB0–PB7, PC0–PC7, PD0–PD7 | Bi-directional I/O ports | Up to 32 multifunctional I/O lines; 22 alternate function lines (SPI/SCI/I²C/timer signals); 12 high-sink outputs (20 mA). |
| AD0–AD7 | Analog input multiplexing | Shared with port pins; enables up to 16 ADC channel selections via software-controlled analog switch matrix. |
Key Features
| Feature | Design Value |
|---|---|
| In-Application Programming (IAP) | Enables firmware updates over SCI or SPI without external programmer, preserving RAM contents during reflash. |
| Configurable Watchdog Timer | Programmable timeout (1 ms to 2 s) with optional WDGHALT mode to continue counting during Halt mode. |
| PWM Auto-Reload Timer (ART) | 8-bit timer with 4 independent PWM outputs, 2 input captures, and event-triggered reload for motor control timing precision. |
| Nested Interrupt Controller | 14 priority-level vectors with automatic context save/restore; supports fast ISR entry (<3 cycles) and TLI on larger packages. |
| Low-Voltage Detector (LVD) | Detects VDD drop below programmable threshold (typically 4.0V or 3.5V) and triggers interrupt or reset to prevent erratic operation. |
Applications
| Automotive Body Control Unit | Industrial Sensor Hub |
|---|---|
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 real-time CAN-linked command parsing, PWM-driven actuator control, and ADC-based position feedback sampling. Use Value: Integrated 48KB Flash stores multi-variant firmware; 12 high-sink I/O drive relays directly; LVD/AVD ensures fail-safe shutdown during battery brownout. |
Use Scenario: Aggregation and preprocessing of temperature, humidity, and vibration sensor data in factory-floor edge nodes. IC Role / Device Role / Timing Role: Local decision engine performing threshold-triggered alerts, time-stamped logging, and SPI-to-bridge communication with gateway MCU. Use Value: 10-bit ADC with 16-channel mux enables multi-sensor scanning without external MUX; low-power Wait mode extends battery life in wireless variants. |
| Smart Appliance Main Controller | Medical Diagnostic Instrument Subsystem |
Use Scenario: Core logic for washing machine cycle sequencing, motor phase control, and user interface management. IC Role / Device Role / Timing Role: Real-time coordinator managing 16-bit timer-based motor commutation, SCI-based UI communication, and ADC-monitored water level/temperature. Use Value: Dual 16-bit timers support precise PWM generation and input capture for brushless motor control; I²C interface connects to EEPROM and display driver. |
Use Scenario: Signal conditioning and protocol translation module in portable ECG or pulse oximeter devices. IC Role / Device Role / Timing Role: Analog front-end supervisor acquiring low-noise biopotential signals via ADC, applying digital filtering, and forwarding processed data via SCI to host processor. Use Value: Low-current coupling ADC minimizes analog interference; -40°C to +125°C rating supports sterilization cycles; read-out protected Flash secures calibration algorithms. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit MCU applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ST72F324BJ7T6TR | 60KB Flash, 2KB RAM, same LQFP44 package and peripheral set; adds extra I/O and enhanced debug features. | Higher firmware complexity (e.g., OTA update stacks, dual-bank bootloaders) requiring more memory headroom. | Select when future firmware expansion or bootloader isolation is required; pin-compatible but requires Flash layout review. |
| STM8AF5269TAY | STM8 core, 32KB Flash, 2KB RAM, extended automotive qualification (AEC-Q100 Grade 1), identical LQFP44 footprint. | Automotive powertrain or chassis modules needing AEC-Q100 compliance and longer product lifecycle support. | Choose for new automotive designs requiring formal qualification; not drop-in due to instruction set and register map differences. |
Compared with ST72F321BJ7T6TR, ST72F324BJ7T6TR offers memory headroom for complex firmware, while STM8AF5269TAY provides AEC-Q100 certification and modern toolchain support - both require PCB layout verification and firmware adaptation.
Availability
ST72F321BJ7T6TR is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor hubs, smart appliance controllers, and medical diagnostic subsystems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ST72F321BJ7T6TR 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 ICs, sensors, and automotive-grade components since 1987.
The ST7 family was engineered for cost-sensitive, real-time embedded control in automotive and industrial environments - emphasizing low-power operation, robust I/O, and field-programmable Flash for rapid iteration and maintenance.
FAQ
Is ST72F321BJ7T6TR supported by current ST development tools?
Yes - STVD (ST Visual Develop) and STVP (ST Visual Programmer) fully support this device for debugging, flash programming, and configuration. ST's legacy ST7 toolchain remains maintained for production use, though migration paths to STM8 are recommended for new designs.
What is the maximum ADC sampling rate for ST72F321BJ7T6TR?
The ADC achieves up to 1 MSPS conversion rate under optimal conditions (VDD ≥ 5.0 V, internal clock = 16 MHz). Conversion time is 13 µs per sample, with throughput limited by software overhead and channel multiplexing sequence.
Does ST72F321BJ7T6TR include hardware CRC or memory parity?
No - the device lacks dedicated hardware CRC or RAM parity checking. Memory integrity relies on software-implemented checksums, watchdog supervision, and LVD-triggered safe-state entry during supply anomalies.
Can the PLL be disabled to run solely from the internal RC oscillator?
Yes - the PLL can be bypassed via the CLKSW register, allowing direct use of the internal RC oscillator (nominal 8 MHz, ±10% tolerance) or external clock source. This configuration reduces power and eliminates crystal-related BOM cost and layout constraints.
ST72F321BJ7T6TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 44-LQFP
- Series:
- ST7
- Packaging:
- Tape & Reel (TR)
- 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:
- 48KB (48K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 1.5K 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:
ST72F321BJ7T6TR FAQ
1.How can I place an order for ST72F321BJ7T6TR through Aetrix?
Please submit a Request for Quotation (RFQ) for ST72F321BJ7T6TR 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 ST72F321BJ7T6TR reliable?
The price and inventory of ST72F321BJ7T6TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST72F321BJ7T6TR is usually 5 days.
3.What payment methods are accepted for ST72F321BJ7T6TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST72F321BJ7T6TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ST72F321BJ7T6TR?
ST72F321BJ7T6TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ST72F321BJ7T6TR 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 ST72F321BJ7T6TR?
For technical support, including ST72F321BJ7T6TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST72F321BJ7T6TR requirements.
6.How does Aetrix verify that ST72F321BJ7T6TR is sourced from the original manufacturer or authorized distributors?
All ST72F321BJ7T6TR 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 ST72F321BJ7T6TR meets industry standards.
7.What is the process for return or replacement of ST72F321BJ7T6TR?
All ST72F321BJ7T6TR units undergo pre-shipment inspection (PSI). If there is an issue with ST72F321BJ7T6TR, 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 ST72F321BJ7T6TR part is unused and in its original packaging.
Return procedure for ST72F321BJ7T6TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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