AVR64DB28T-E/SO

Overview

The AVR64DB28T-E/SO is an 8-bit microcontroller from the AVR DB family, featuring a hardware multiplier CPU running at up to 24 MHz. It includes 64 KB of Flash, 8 KB of SRAM, and 512 bytes of EEPROM. The device operates within a supply voltage range of 1.8V to 5.5V and supports industrial (-40°C to +85°C) and extended (-40°C to +125°C) temperature ranges. Key peripherals include a 12-bit differential ADC, three analog comparators, one DAC, three op amps, three zero-cross detectors, and multi-voltage I/O (MVIO). It is housed in a 28-pin SOIC package with tape and reel carrier.

Feature Summary

• Multi-Voltage I/O (MVIO) on Port C enables true level-shifted bidirectional communication with devices operating on different power domains without external level shifters.
• Analog signal conditioning subsystem integrates three operational amplifiers with internal resistor ladders for flexible configurations requiring no external components.
• Event System allows CPU-independent and predictable inter-peripheral signaling, reducing system latency and improving real-time control performance.
• Configurable Custom Logic (CCL) provides programmable Look-up Tables to implement custom digital logic functions independently of the CPU.

Applications

• Industrial control systems requiring robust noise immunity and multi-domain communication
• Smart energy meters and utility applications utilizing zero-cross detection
• Home appliances and consumer electronics needing precise analog signal processing
• IoT sensor nodes requiring low-power operation and efficient event-driven architectures

Procurement Notes

Verify the ordering suffix 'T' confirms tape and reel packaging and 'E' indicates the extended temperature range (-40°C to +125°C). Confirm the 'SO' suffix corresponds to the SOIC-28 package style. Ensure compatibility with existing designs by checking pin and feature compatibility within the AVR DB family for vertical migration without code modification.

Selection Notes

Select this component when multi-voltage I/O capabilities are required to interface with mixed-signal or multi-supply domain peripherals directly. The inclusion of three op amps and zero-cross detectors makes it suitable for applications involving AC mains sensing or complex analog front-end conditioning. Consider the 28-pin form factor for space-constrained designs that still require extensive analog and digital peripheral integration.

Part Context

This part belongs to the AVR DB family, which offers vertical migration across 28, 32, 48, and 64-pin variants without code changes. The AVR64DB28 variant specifically provides 64 KB of Flash and 8 KB of SRAM, balancing memory capacity with a compact footprint. It shares architectural features with larger DB devices, including kernel-independent peripherals and advanced analog subsystems.

Replacement Considerations

AVR64DB28-I/SO

FAQ

What is the function of the Multi-Voltage I/O (MVIO) feature?

MVIO on Port C allows the I/O pins to operate at a different voltage threshold than the core supply, enabling direct bidirectional communication with devices on different power domains without external level translators.

How many operational amplifiers are integrated into the AVR64DB28?

The AVR64DB28 integrates three operational amplifiers (OPAMPs), each equipped with an internal resistor ladder for flexible analog signal conditioning configurations.