Microchip Technology ATMEGA1284RFR2-ZU

Overview

ATMEGA1284RFR2-ZU from Microchip Technology (formerly Atmel) is an 8-bit AVR microcontroller with integrated 2.4 GHz IEEE 802.15.4/ZigBee transceiver in a 48-pin QFN package. It delivers 16 MIPS at 16 MHz, features 128 KB Flash, 4 KB EEPROM, 16 KB SRAM, and operates from 1.8–3.6 V. It targets low-power wireless sensor nodes and mesh network routers requiring concurrent MCU execution and robust RF communication.

For engineers reviewing the ATMEGA1284RFR2-ZU datasheet, ATMEGA1284RFR2-ZU pinout, ATMEGA1284RFR2-ZU application, or ATMEGA1284RFR2-ZU equivalent, key selection criteria include integrated transceiver performance (−100 dBm RX sensitivity, up to +3.5 dBm TX output), hardware-accelerated MAC support (auto-acknowledge, auto-retry), AES encryption, and ultra-low deep-sleep current (<700 nA).

Technical Context

The ATMEGA1284RFR2-ZU integrates an enhanced RISC AVR core with a fully featured 2.4 GHz DSSS transceiver compliant with IEEE 802.15.4-2011 and ZigBee standards. Its architecture includes a fractional-N PLL synthesizer with 5 MHz/500 kHz channel spacing, hardware-assisted PAN address filtering, and a 32-bit MAC symbol counter synchronized to the 32.768 kHz oscillator.

It supports multiple data rates (250 kb/s to 2 Mb/s), provides 128-byte TX/RX frame buffers, and implements hardware CRC-16, SFD detection, spreading/despreading, and antenna diversity control. Power management includes six software-selectable sleep modes, with deep-sleep current <700 nA while maintaining RTC and symbol counter operation.

Key Specifications

Pinout & Package

ATMEGA1284RFR2-ZU uses a 48-pad, 7×7 mm QFN package with exposed thermal pad internally connected to AVSS. The package supports 33 programmable I/O lines across Ports B, D, E, F, and G, with dedicated RF differential I/O pins (RFP/RFN) and dual crystal interfaces (16 MHz for RF, 32.768 kHz for low-power timing).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 2.4 GHz wireless microcontroller applications.

Compared with ATMEGA2564RFR2-ZU and ATMEGA644RFR2-ZU, the ATMEGA1284RFR2-ZU balances memory capacity, RF performance, and power efficiency-making it optimal for mid-tier ZigBee routers and sensor hubs requiring reliable packet forwarding without excessive BOM cost.

Availability

ATMEGA1284RFR2-ZU is available at Aetrix Electronics and suitable for ZigBee mesh networking, smart metering, and industrial wireless sensor applications requiring stable component supply and long-term lifecycle support.

Supply support for ATMEGA1284RFR2-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 acquired Atmel in 2016 and maintains full product support, documentation, and manufacturing continuity for the AVR RFR2 family.

The ATMEGA1284RFR2-ZU belongs to Microchip's wireless MCU product line, designed specifically for IEEE 802.15.4 and ZigBee-compliant embedded systems requiring integrated RF, low power, and real-time deterministic processing.

FAQ

What is the maximum transmit output power of the ATMEGA1284RFR2-ZU?

The ATMEGA1284RFR2-ZU achieves up to +3.5 dBm TX output power in its highest RF power setting. This value is measured at the RFP/RFN differential port under standard test conditions (3.3 V supply, 25°C ambient). Actual radiated power depends on external balun and antenna matching network efficiency, typically delivering 0–2 dBm EIRP after PCB-level integration.

Does the ATMEGA1284RFR2-ZU support hardware AES encryption?

Yes, the ATMEGA1284RFR2-ZU includes a dedicated hardware AES-128 engine and true random number generator. These peripherals operate independently of the AVR core, enabling secure key derivation, encrypted payload generation, and authenticated decryption without CPU intervention-reducing latency and power consumption during security-critical operations.

What crystal frequencies are required for the ATMEGA1284RFR2-ZU?

The ATMEGA1284RFR2-ZU requires two crystals: a 16 MHz fundamental-mode crystal on XTAL1/XTAL2 for the RF transceiver PLL reference, and a 32.768 kHz tuning-fork crystal on PG3/PG4 for the low-power asynchronous timer and IEEE 802.15.4 symbol counter. Both crystals must meet specified load capacitance (12 pF for 16 MHz; 12–25 pF for 32.768 kHz) and ESR limits per the datasheet.

How many ADC channels does the ATMEGA1284RFR2-ZU support?

The ATMEGA1284RFR2-ZU supports seven single-ended ADC input channels (ADC0–ADC7, excluding ADC3/ADC4 multiplexed on PF3/PF4). It features a 10-bit successive approximation register (SAR) ADC with 330 ks/s sampling rate, internal voltage reference, and optional differential input with programmable gain-suitable for direct connection to thermistors, RTDs, and analog sensors.

Is the ATMEGA1284RFR2-ZU pin-compatible with other RFR2 family members?

Yes, the ATMEGA1284RFR2-ZU shares identical QFN48 pinout, electrical characteristics, and peripheral mapping with ATMEGA2564RFR2-ZU and ATMEGA644RFR2-ZU. Memory differences (Flash/EEPROM/SRAM) do not affect pin functionality or layout-enabling drop-in replacement during design iteration or volume production scaling.