90LS2323 - 8-Bit AVR Microcontroller Technical Summary

Overview

The AT90S/LS2323 and AT90S/LS2343 are low-power CMOS 8-bit microcontrollers based on the AVR enhanced RISC architecture. These devices execute powerful instructions in a single clock cycle, achieving throughputs approaching 1 MIPS per MHz. This high performance combined with low power consumption makes them ideal for power-sensitive embedded applications.

The microcontrollers feature a combination of Flash program memory, EEPROM data memory, and SRAM, along with versatile I/O capabilities and multiple peripheral features. The devices are available in different variants with varying I/O counts and voltage ranges to suit different application requirements.

Key Features

Core Architecture

• AVR Enhanced RISC architecture for high performance and low power operation
• 118 powerful instructions with most executing in a single clock cycle
• 32 × 8 general purpose working registers for efficient data processing
• Up to 10 MIPS throughput at 10 MHz clock speed

Memory Configuration

• 2KB of In-System Programmable (ISP) Flash memory for program storage
• 128 bytes of EEPROM for non-volatile data storage
• 128 bytes of internal SRAM for data handling
• Flash endurance: 1,000 write/erase cycles
• EEPROM endurance: 100,000 write/erase cycles

Power Management

• Wide operating voltage range: 2.7V to 6.0V (LS versions)
• Low power idle and power down modes for energy efficiency
• Selectable on-chip RC oscillator for reduced external component count
• Power-on reset circuit for reliable startup

Peripheral Features

• One 8-bit timer/counter with separate prescaler
• Programmable watchdog timer with on-chip oscillator
• External and internal interrupt sources for flexible event handling
• SPI serial interface for in-system programming
• Programming lock for Flash program and EEPROM data security

I/O Capabilities

• AT90S/LS2323: 3 programmable I/O lines
• AT90S/LS2343: 5 programmable I/O lines

Applications

The 90LS2323 microcontroller is well-suited for a wide range of embedded applications, including:

• Consumer electronics and appliances
• Industrial control systems
• Sensor interfaces and data acquisition
• Automotive electronics
• Security systems
• Battery-powered devices
• Home automation systems
• Peripheral control in larger systems

Electrical Characteristics

Absolute Maximum Ratings

• Supply Voltage (VCC): -0.5V to +6.0V
• Input Voltage (except RESET): -0.5V to VCC+0.5V
• RESET Pin Voltage: -0.5V to +13.0V
• Maximum Operating Temperature: -40°C to +85°C
• Storage Temperature: -65°C to +150°C

Operating Conditions

• AT90S2323/AT90S2343:
  • Supply Voltage: 4.0V to 6.0V
  • Speed Grade: 0 to 10 MHz
• AT90LS2323/AT90LS2343:
  • Supply Voltage: 2.7V to 6.0V
  • Speed Grade: 0 to 4 MHz

Power Consumption

Typical power consumption values (at 4MHz, 3V, 25°C):

• Active Mode: 1.5 mA
• Idle Mode: 0.5 mA
• Power Down Mode: <1 µA

Package Information

The 90LS2323 is available in an 8-pin package configuration:

• 8-pin PDIP (Plastic Dual In-line Package)
• 8-pin SOIC (Small Outline Integrated Circuit)

Pin Configuration

The 8-pin package includes the following pins:

• 1: RESET (Reset input, active low)
• 2: PD0/RXD (I/O port pin / UART receive)
• 3: PD1/TXD (I/O port pin / UART transmit)
• 4: GND (Ground)
• 5: PB0/SCK (I/O port pin / SPI clock)
• 6: PB1/MISO (I/O port pin / SPI master in slave out)
• 7: PB2/MOSI (I/O port pin / SPI master out slave in)
• 8: VCC (Supply voltage)

Development Support

The 90LS2323 is supported by a comprehensive development ecosystem:

• AVR Studio development environment
• GCC-based AVR toolchain
• In-system programming via SPI interface
• Third-party compiler and IDE support
• Evaluation boards and starter kits

Conclusion

The 90LS2323 microcontroller offers an excellent balance of performance, power efficiency, and cost-effectiveness for embedded applications. Its RISC architecture provides high computational throughput while maintaining low power consumption, making it particularly suitable for battery-powered devices. With its integrated memory, versatile I/O capabilities, and robust peripheral set, this microcontroller can serve as the foundation for a wide variety of electronic systems.

The device's in-system programmability and comprehensive development support further enhance its appeal for both prototyping and production applications, reducing time-to-market and development costs.