ATTINY441-SSU

Overview

The ATtiny441-SSU is an 8-bit AVR microcontroller in a 14-pin SOIC package. It features 4K bytes of In-System Programmable Flash, 256 bytes of EEPROM, and 256 bytes of SRAM. The device operates at speeds up to 16 MHz with a throughput of 16 MIPS at 16 MHz. It supports supply voltages from 1.7V to 5.5V across industrial temperature ranges (-40°C to +85°C). Key peripherals include two full-duplex USARTs, master/slave SPI, slave I2C, a 10-bit ADC with differential channels, and multiple timer/counters.

Feature Summary

• Dual full-duplex Universal Synchronous/Asynchronous Serial Receiver/Transmitters (USARTs) with start frame detection capabilities
• Master or Slave Serial Peripheral Interface (SPI) and Slave Two-Wire Interface (I2C) for communication
• 10-bit Analog-to-Digital Converter supporting single-ended and differential input channels with programmable gain
• Calibrated internal oscillators including an 8MHz main clock and a 32kHz ultra-low power oscillator

Applications

• Embedded systems requiring dual serial communication interfaces
• Battery-powered devices utilizing low-power sleep modes
• Sensor interfacing applications using the high-resolution ADC
• Industrial control systems operating within extended temperature ranges

Procurement Notes

Verify the specific speed grade suffix matches the required operational frequency. Confirm the package type corresponds to the 14-lead SOIC variant. Ensure the voltage range requirements align with the 1.7V to 5.5V specification. Check for any specific programming lock or security bit configurations needed for the application.

Selection Notes

Select this component when dual USARTs are necessary, as many ATtiny variants offer only one. Consider the 16 MHz performance limit and the 1.7V minimum operating voltage. Evaluate the need for the specific peripheral set, such as the slave-only I2C interface and the differential ADC inputs, against alternative microcontrollers.

Part Context

This device belongs to the ATtiny441/841 family, which enhances the classic AVR architecture with additional communication interfaces. Unlike previous generations, it integrates two USARTs and a dedicated slave I2C interface. The family maintains compatibility with standard AVR development tools while offering improved analog capabilities through the enhanced ADC module.

Replacement Considerations

ATtiny441-SSUR

FAQ

Does the ATtiny441 support Master I2C mode?

No, the datasheet specifies a Slave I2C Serial Interface. It does not support Master mode operation for the Two-Wire Interface.

What is the maximum operating frequency for the ATtiny441-SSU?

The maximum operating frequency is 16 MHz at supply voltages between 4.5V and 5.5V.

How many Timer/Counters are available on this device?

The device includes one 8-bit timer/counter and two 16-bit timer/counters.