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90LS4434 - 8-Bit AVR Microcontroller Technical Summary

Overview

The AT90S4434/8535 (including the 90LS4434 variant) is a low-power CMOS 8-bit microcontroller based on the AVR® enhanced RISC architecture. This microcontroller family delivers high performance with low power consumption by executing powerful instructions in a single clock cycle, achieving throughputs approaching 1 MIPS per MHz. This efficiency allows system designers to optimize power consumption versus processing performance for a wide range of embedded applications.

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 x 8 general purpose working registers for efficient data handling
• Up to 8 MIPS throughput at 8 MHz clock speed

Memory Configuration

• Flash Memory:
  • 4K bytes of In-System Programmable Flash (AT90S/LS4434)
  • 8K bytes of In-System Programmable Flash (AT90S/LS8535)
  • SPI serial interface for in-system programming
  • Endurance: 1,000 write/erase cycles
• EEPROM:
  • 256 bytes (AT90S/LS4434)
  • 512 bytes (AT90S/LS8535)
  • Endurance: 100,000 write/erase cycles
• SRAM:
  • 256 bytes internal SRAM (AT90S/LS4434)
  • 512 bytes internal SRAM (AT90S/LS8535)

Peripheral Features

• 8-channel, 10-bit ADC for analog signal processing
• 32 programmable I/O lines for flexible interfacing
• Programmable Serial UART for communication
• Three PWM channels for power control applications
• On-chip analog comparator
• Real-time counter with separate oscillator

Timer/Counter Resources

• Two 8-bit timer/counters with separate prescalers and compare modes
• One 16-bit timer/counter with separate prescaler, compare, and capture modes

Power Management

• Three sleep modes: Idle, Power Save, and Power Down
• Low voltage operation: 2.7V - 6.0V (AT90LS4434/AT90LS8535)
• Standard voltage operation: 4.0V - 6.0V (AT90S4434/AT90S8535)
• Power-on reset circuit

Security Features

• Programming lock for software security
• Programmable watchdog timer with on-chip oscillator

Applications

The 90LS4434 microcontroller is suitable for a wide range of embedded control applications, including:

• Industrial control systems
• Consumer electronics
• Automotive systems
• Home appliances
• Sensor interfaces
• Power management systems
• Motor control applications
• Security systems
• Medical devices
• Wireless communication devices

Electrical Characteristics

Operating Conditions

• Voltage Range:
  • AT90S4434/AT90S8535: 4.0V - 6.0V
  • AT90LS4434/AT90LS8535: 2.7V - 6.0V
• Speed Grades:
  • AT90S4434/AT90S8535: 0 - 8 MHz
  • AT90LS4434/AT90LS8535: 0 - 4 MHz
• Temperature Range: Commercial (0°C to +70°C) and Industrial (-40°C to +85°C) options available

Power Consumption

The microcontroller features excellent power efficiency with multiple sleep modes:

• Active Mode: 3.6 mA at 4 MHz, 3V
• Idle Mode: 1.0 mA at 4 MHz, 3V
• Power Down Mode: < 1 μA at 3V

ADC Characteristics

• 10-bit resolution
• 8 multiplexed input channels
• Conversion time: 65 μs - 260 μs depending on clock settings
• Integral nonlinearity: ±2 LSB
• Differential nonlinearity: ±1 LSB

Package Information

The 90LS4434 is available in multiple package options to suit different application requirements:

• 40-pin PDIP (Plastic Dual In-line Package):
  • Dimensions: 52.32 x 13.97 mm
  • Lead pitch: 2.54 mm
  • Standard through-hole mounting
• 44-pin TQFP (Thin Quad Flat Package):
  • Dimensions: 10 x 10 mm body
  • Lead pitch: 0.8 mm
  • Surface mount package
• 44-pin PLCC (Plastic Leaded Chip Carrier):
  • Dimensions: 16.59 x 16.59 mm
  • Lead pitch: 1.27 mm
  • Surface mount package with J-leads

Pin Configuration

The microcontroller features a comprehensive I/O structure with:

• Four 8-bit I/O ports (Port A, B, C, D)
• Analog input pins multiplexed with Port A
• Special function pins for:
  • Reset
  • Clock input
  • Serial communication
  • Timer/counter I/O
  • External interrupts

Development Support

The 90LS4434 is supported by a comprehensive development ecosystem:

• AVR Studio development environment
• GCC-based AVR toolchain
• JTAG and SPI programming interfaces
• Evaluation boards and starter kits
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