ATTINY43U-SUR

Overview

The ATtiny43U-SUR is an 8-bit AVR microcontroller featuring 4K bytes of In-System Programmable Flash, 64 bytes EEPROM, and 256 bytes SRAM. It operates at speeds up to 8 MHz with a supply voltage range of 1.8V to 5.5V. The device includes two 8-bit Timer/Counters, a 4-channel 10-bit ADC, an analog comparator, and a Universal Serial Interface. It supports capacitive touch sensing via the QTouch Library and offers low-power modes including Idle, Power-down, and ADC Noise Reduction.

Feature Summary

• Built-in boost converter enables operation from external low-voltage sources by providing an internal 3V supply.
• Supports capacitive touch sensing interfaces through the integrated QTouch Library for up to eight channels.
• Features advanced RISC architecture executing most instructions in a single clock cycle for high throughput.
• Includes debugWIRE on-chip debug system and in-system programming capability via SPI interface.

Applications

• Battery-powered devices requiring extended runtime through low-voltage operation and power-saving modes
• Applications utilizing capacitive touch user interfaces
• Systems needing precise analog signal acquisition using the 10-bit ADC
• Embedded control systems requiring robust non-volatile memory retention

Procurement Notes

Verify that the ordering suffix 'SUR' corresponds to the tape and reel packaging format as specified in the official Microchip Technology documentation. Confirm the specific speed grade and temperature range requirements align with the industrial specifications defined for this part number before finalizing procurement orders.

Selection Notes

Select the ATtiny43U-SUR when application constraints require operation below 1.8V using the internal boost converter or when capacitive touch sensing capabilities are necessary without external components. Ensure the design accommodates the required external inductor connection for the boost converter functionality if operating in low-voltage mode.

Part Context

This component belongs to the ATtiny43U family of 8-bit AVR microcontrollers manufactured by Microchip Technology (formerly Atmel). The series is characterized by its enhanced RISC core, non-volatile memory options, and specialized features like the integrated boost converter and touch sensing support within a compact package.

Replacement Considerations

Consult official Microchip Technology documentation for confirmed substitute part numbers. Verify pin compatibility, memory sizes, and electrical characteristics against the ATtiny43U datasheet before implementing any alternative components in existing designs.