ATTINY45-20SI

Overview

The ATtiny45-20SI is an 8-bit AVR microcontroller featuring 4K bytes of In-System Programmable Flash, 256 bytes of EEPROM, and 256 bytes of SRAM. It operates at a maximum clock frequency of 20 MHz within a voltage range of 2.7V to 5.5V. The device includes a 10-bit ADC with four single-ended channels, two PWM channels, and six programmable I/O lines. It utilizes an 8-lead SOIC package and supports industrial temperature ranges.

Feature Summary

• Advanced RISC architecture executing most instructions in a single clock cycle for high throughput efficiency.
• Non-volatile memory with high endurance ratings for both program Flash and data EEPROM.
• Integrated analog-to-digital converter with differential channel pairs and programmable gain options.
• Supports multiple power-saving modes including Idle, Power-down, and ADC Noise Reduction.

Applications

• Battery-powered embedded systems requiring low active and standby current consumption.
• Simple sensor interfaces utilizing the internal ADC and analog comparator.
• Motor control applications leveraging the hardware PWM outputs and dead time generator.
• General-purpose digital logic replacement in cost-sensitive consumer electronics.

Procurement Notes

Verify that the specific ordering code matches the required speed grade and voltage operating range. Confirm the package type corresponds to the design footprint requirements. Ensure compliance with RoHS directives if lead-free variants are specified for the manufacturing process.

Selection Notes

Select this component when 4K bytes of program memory is sufficient for the application firmware. Consider the 20 MHz speed grade only if the supply voltage remains above 4.5V. Evaluate the 8-lead SOIC package constraints against available PCB space and thermal dissipation needs.

Part Context

This part belongs to the ATtiny25/45/85 family of 8-bit microcontrollers based on the AVR enhanced RISC architecture. The family shares common peripheral sets and instruction sets, differing primarily in memory sizes and specific pin configurations. The ATtiny45 variant provides a mid-range memory capacity between the 2K and 8K byte models.

Replacement Considerations

ATtiny45-10SI

FAQ

What is the maximum operating frequency at 2.7V?

At a supply voltage of 2.7V, the maximum operating frequency is limited to 10 MHz.

Does the device support external interrupts?

Yes, the ATtiny45 features external interrupt sources triggered by INT0.