ATTINY44A-SSF

Overview

The ATtiny44A-SSF is a low-power CMOS 8-bit microcontroller based on the AVR enhanced RISC architecture. It features 4K bytes of In-System Programmable Flash, 256 bytes of EEPROM, and 256 bytes of SRAM. The device includes twelve programmable I/O lines, an 8-channel 10-bit ADC with programmable gain, and two timer/counters supporting PWM. Operating voltage ranges from 1.8V to 5.5V, with speed grades up to 20 MHz at 4.5–5.5V. It supports industrial temperature range (-40°C to +85°C) and offers multiple power-saving modes including Idle, ADC Noise Reduction, Standby, and Power-down.

Feature Summary

• Advanced RISC architecture executing most instructions in a single clock cycle for high throughput efficiency.
• Non-volatile memory segments with high endurance ratings for Flash and EEPROM data retention.
• Integrated analog peripherals including a 10-bit ADC with differential channel pairs and an analog comparator.
• Comprehensive power management with software-selectable sleep modes to minimize active and standby consumption.

Applications

• Battery-powered sensor nodes requiring low active current consumption
• Industrial control systems operating within extended temperature ranges
• Consumer devices utilizing capacitive touch sensing interfaces
• Embedded applications needing in-system programming via SPI interface

Procurement Notes

Verify the specific suffix 'SSF' against Microchip's official ordering information to confirm package type and tape/reel specifications. Ensure compatibility with existing PCB footprints for the designated package variant. Confirm that the industrial temperature grade meets system environmental requirements. Cross-reference fuse settings and lock bits if migrating from previous revisions or similar family members.

Selection Notes

Select this component when 4K Flash and 256-byte SRAM are sufficient for application logic. Choose over ATtiny24A/84A variants based on specific memory capacity needs. Consider the 14-pin SOIC or WQFN packages depending on board space constraints. Evaluate power consumption profiles across different voltage and frequency combinations to optimize battery life versus processing speed requirements.

Part Context

This part belongs to the ATtiny24A/44A/84A family of 8-bit AVR microcontrollers. It shares architectural similarities with the ATtiny24A (2K Flash) and ATtiny84A (8K Flash), differing primarily in non-volatile memory sizes. All variants utilize the same core CPU, peripheral set, and pinout configurations, facilitating design scalability within the same product line while maintaining code compatibility.

Replacement Considerations

Direct substitutes include other ATtiny44A variants with different package suffixes (e.g., SSU for UFBGA). Verify pin compatibility and electrical characteristics before substituting. Cross-family replacements require careful review of instruction set differences and peripheral availability. Consult Microchip's official cross-reference tools for validated alternatives.

FAQ

What is the maximum operating frequency at 1.8V supply?

At 1.8V to 5.5V supply, the maximum operating frequency is 4 MHz.

Does the ATtiny44A support external interrupts?

Yes, it supports internal and external interrupt sources, including pin change interrupts on all 12 I/O pins.

How many PWM channels are available?

The device provides two PWM channels from the 8-bit Timer/Counter0 and two additional channels from the 16-bit Timer/Counter1.