ATTINY3217-MFR

Overview

The ATTINY3217-MFR is an 8-bit microcontroller from the tinyAVR 1-series, featuring a 20 MHz AVR CPU with hardware multiplier. It includes 32 KB Flash, 2 KB SRAM, and 256 bytes EEPROM. The device operates within a voltage range of 1.8 V to 5.5 V and supports frequencies up to 20 MHz at 4.5 V–5.5 V. It utilizes a 24-pin VQFN package (4x4 mm) and provides up to 22 programmable I/O lines. Key peripherals include a Peripheral Touch Controller (PTC), Event System (EVSYS), Configurable Custom Logic (CCL), and multiple timers.

Feature Summary

• Integrates Core Independent Peripherals (CIPs) such as the Peripheral Touch Controller (PTC) for capacitive touch sensing and Configurable Custom Logic (CCL) for hardware logic implementation.
• Features an advanced Event System (EVSYS) enabling direct inter-peripheral signaling without CPU intervention for predictable timing.
• Includes high-precision analog components like dual 10-bit ADCs, three 8-bit DACs, and multiple internal voltage references.

Applications

• Capacitive touch interface designs utilizing PTC technology
• Low-power embedded systems requiring event-driven peripheral communication
• Industrial control applications using CCL for custom logic functions

Procurement Notes

Verify the specific speed grade suffix (e.g., MFR) against the official datasheet to confirm the supported operating frequency and voltage range. Ensure the 24-pin VQFN package dimensions match the target PCB footprint. Confirm that the required temperature range aligns with the device's industrial specifications.

Selection Notes

Select this component when application requirements demand significant on-chip memory (32 KB Flash) combined with specialized analog and touch capabilities. It is suitable for designs needing flexible hardware logic via CCL or efficient peripheral-to-peripheral communication via EVSYS, reducing CPU load compared to standard timer-based interrupt architectures.

Part Context

This part belongs to the tinyAVR 1-series family, representing Microchip's modern 8-bit architecture. It succeeds previous generations by integrating advanced features like the Event System and CIPs into a compact form factor. The series targets applications requiring enhanced performance and peripheral flexibility while maintaining low power consumption.

Replacement Considerations

Direct pin-compatible replacements within the same package are limited due to unique peripheral configurations. Verify functional equivalence for the Event System and PTC if migrating from other AVR families. Consult the official cross-reference documentation for compatible devices with similar memory and I/O counts.

FAQ

What is the maximum operating frequency for the ATTINY3217-MFR?

The device supports operation up to 20 MHz when powered between 4.5 V and 5.5 V.

Does the ATTINY3217 support capacitive touch sensing?

Yes, it integrates a Peripheral Touch Controller (PTC) capable of handling self-capacitance and mutual capacitance channels.