Microchip Technology ATMEGA64RFR2-ZU

Overview

ATMEGA64RFR2-ZU from Microchip (formerly Atmel) is an 8-bit AVR microcontroller integrated with a 2.4 GHz IEEE 802.15.4-compliant transceiver for ZigBee, RF4CE, and 6LoWPAN applications. It features 64 KB Flash, 2 KB EEPROM, 8 KB SRAM, 38 programmable I/O lines, and operates from 1.8–3.6 V with ultra-low power consumption (4.1 mA CPU active @ 16 MHz, <700 nA deep sleep).

For engineers reviewing the ATMEGA64RFR2-ZU datasheet, ATMEGA64RFR2-ZU pinout, ATMEGA64RFR2-ZU application, or ATMEGA64RFR2-ZU equivalent, key selection criteria include its monolithic 2.4 GHz transceiver performance (−100 dBm RX sensitivity, +3.5 dBm TX output), hardware-accelerated MAC, AES encryption engine, and QFN-64 package with dedicated RF differential I/O pins.

Technical Context

The ATMEGA64RFR2-ZU integrates an enhanced RISC AVR core with a fully embedded 2.4 GHz DSSS transceiver supporting 250/500 kb/s, 1 Mb/s, and 2 Mb/s data rates. Its architecture includes a fractional-N PLL synthesizer with 5 MHz/500 kHz channel spacing, hardware-assisted IEEE 802.15.4 MAC (auto-ack, auto-retry, CRC-16), and a 32-bit symbol counter synchronized to the RF clock.

Power management combines six software-selectable sleep modes-including Deep Sleep (<700 nA), RX_ON (6.0 mA), and BUSY_TX (18.6 mA)-with internal voltage regulation (DVDD/AVDD), dual crystal support (16 MHz main + 32.768 kHz RTC), and on-chip temperature sensor. All peripherals-including two USARTs, SPI, 10-bit ADC, and JTAG debug interface-are accessible while maintaining RF coexistence.

Key Specifications

Pinout & Package

The ATMEGA64RFR2-ZU uses a 64-pin QFN package with an exposed metal thermal pad (internally tied to AVSS) that must be soldered to the PCB for mechanical stability and thermal performance. Pin functions are defined per port and dedicated RF/analog/digital supply domains.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar wireless microcontroller applications.

Compared with ATMEGA128RFR2-ZU and ATMEGA256RFR2-ZU, the ATMEGA64RFR2-ZU delivers optimal cost-performance balance for compact sensor nodes and mid-tier routers-offering full IEEE 802.15.4 functionality in the smallest memory footprint of the RFR2 family without sacrificing RF performance or security features.

Availability

ATMEGA64RFR2-ZU is available at Aetrix Electronics and suitable for smart home sensor nodes, industrial wireless actuators, ZigBee router devices, and 6LoWPAN edge gateways requiring stable component supply across extended product lifecycles.

Supply support for ATMEGA64RFR2-ZU includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Microchip Technology Inc. is a global semiconductor company delivering microcontrollers, analog, FPGA, and connectivity solutions for industrial, automotive, consumer, and communications markets.

The ATMEGA64RFR2-ZU belongs to Microchip's legacy AVR wireless MCU product line, designed specifically for ultra-low-power, standards-compliant 2.4 GHz mesh networking in resource-constrained IoT endpoints and infrastructure nodes.

FAQ

What is the maximum transmit output power of the ATMEGA64RFR2-ZU?

The ATMEGA64RFR2-ZU achieves up to +3.5 dBm TX output power in its highest RF power setting. This value is measured under standard conditions (3.3 V supply, 25°C ambient) and enables robust link budgets in indoor and light outdoor environments. The actual output is configurable via register settings and depends on antenna matching and regulatory limits.

Does the ATMEGA64RFR2-ZU support hardware AES encryption?

Yes, the ATMEGA64RFR2-ZU includes a dedicated hardware AES-128 encryption engine and a true random number generator. These modules operate independently of the AVR CPU, allowing secure key derivation, packet encryption, and authentication without consuming CPU cycles or exposing keys in software memory-critical for ZigBee and 6LoWPAN security compliance.

What crystal frequencies are required for the ATMEGA64RFR2-ZU?

The ATMEGA64RFR2-ZU requires two external crystals: a 16 MHz fundamental-mode crystal connected to XTAL1/XTAL2 for the RF transceiver and system clock, and a 32.768 kHz watch crystal on TOSC1/TOSC2 for the real-time counter and low-power sleep timing. Both crystals must meet specified load capacitance and stability requirements per the datasheet.

Is the ATMEGA64RFR2-ZU pin-compatible with the ATMEGA128RFA1?

The ATMEGA64RFR2-ZU uses the same 64-pin QFN package as the ATMEGA128RFA1 and maintains backward compatibility in most cases, including pin mapping for power, ground, RF I/O, and primary peripherals. However, differences exist in register layout, interrupt vectors, and some peripheral configurations-firmware migration requires validation and minor adaptation.

What is the deep sleep current consumption of the ATMEGA64RFR2-ZU?

The ATMEGA64RFR2-ZU achieves <700 nA deep sleep current at 25°C with the watchdog timer, 32.768 kHz oscillator, and MAC symbol counter enabled. This ultra-low quiescent current enables multi-year operation on coin-cell batteries in intermittent-sensing applications, such as environmental monitors or occupancy sensors.