ST72331
ST72331 Microcontroller Technical Summary
Overview
The ST72331 is a high-performance HCMOS Microcontroller Unit (MCU) from STMicroelectronics, designed for embedded applications requiring robust performance and low power consumption. It features an 8-bit CPU core with advanced peripherals, making it suitable for a wide range of industrial and consumer applications.
The microcontroller operates within a voltage range of 3V to 6V and can achieve a maximum CPU frequency of 8 MHz (with a 16 MHz oscillator). It is available in multiple memory configurations and package options to suit different application requirements.
Key Features
- CPU Core: 8-bit architecture with 8 MHz maximum frequency
- Memory Options:
- Program Memory: 8K or 16K bytes
- EEPROM: 256 bytes
- RAM: 384 or 512 bytes (including 256 bytes stack)
- Operating Voltage: 3V to 6V
- Temperature Range: -40°C to +85°C
- Package Options: TQFP44, SDIP42, TQFP64, SDIP56
- Advanced Peripherals:
- Watchdog Timer
- 16-bit Timer
- Serial Peripheral Interface (SPI)
- Serial Communications Interface (SCI)
- 8-bit A/D Converter (ADC)
- Optional Low Voltage Detector Reset
- Power Saving Modes: Slow Mode, Wait Mode, Halt Mode
Applications
The ST72331 microcontroller is designed for a variety of embedded applications, including:
- Industrial control systems
- Automotive electronics
- Consumer electronics
- Home appliances
- Sensor interfaces
- Communication devices
Electrical Characteristics
Absolute Maximum Ratings
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage (VDD) | -0.3 to +7.0 | V |
| Input Voltage on any pin | -0.3 to VDD+0.3 | V |
| Storage Temperature | -65 to +150 | °C |
Recommended Operating Conditions
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Operating Voltage | 3.0 | 5.0 | 6.0 | V |
| Operating Temperature | -40 | 25 | +85 | °C |
| CPU Frequency | - | - | 8 | MHz |
DC Electrical Characteristics
| Parameter | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Supply Current (Run Mode) | 8 MHz, 5V | - | 10 | 15 | mA |
| Supply Current (Wait Mode) | 5V | - | 2 | 5 | mA |
| Supply Current (Halt Mode) | 5V | - | 50 | 100 | µA |
| Input High Voltage | - | 0.7 VDD | - | VDD | V |
| Input Low Voltage | - | 0 | - | 0.3 VDD | V |
Package Information
The ST72331 is available in multiple package options to accommodate different design requirements:
| Package Type | Pin Count | Dimensions | Remarks |
|---|---|---|---|
| TQFP44 | 44 | 10x10x1.0 mm | Thin Quad Flat Package |
| SDIP42 | 42 | 15.24x2.54 mm | Shrink Dual In-line Package |
| TQFP64 | 64 | 14x14x1.0 mm | Thin Quad Flat Package |
| SDIP56 | 56 | 19.05x2.54 mm | Shrink Dual In-line Package |
Memory Organization
The ST72331 features a well-organized memory architecture:
- Program Memory: 8K or 16K bytes of ROM for application code
- Data EEPROM: 256 bytes for non-volatile data storage
- RAM: 384 or 512 bytes (including 256 bytes dedicated to stack operations)
Peripheral Details
I/O Ports
The microcontroller features multiple general-purpose I/O ports with configurable options:
- Programmable input/output
