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Microchip Technology ATMEGA644RFR2-ZUR
- Part No.:
- ATMEGA644RFR2-ZUR
- Manufacturer:
- Microchip Technology
- Category:
- RF Transceiver ICs
- Package:
- 48-VFQFN Exposed Pad
- Datasheet:
-
ATMEGA644RFR2-ZUR.pdf
- Description:
- IC RF TXRX+MCU 802.15.4 48QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,431
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Product details
Overview
ATMEGA644RFR2-ZUR from Microchip Technology (formerly Atmel) is an 8-bit AVR microcontroller integrated with a 2.4 GHz IEEE 802.15.4/ZigBee transceiver in a single QFN48 package. It delivers 64 KB Flash, 2 KB EEPROM, 8 KB SRAM, 33 programmable I/O lines, and operates from 1.8–3.6 V. It targets ultra-low-power wireless sensor nodes requiring robust RF performance and on-chip MAC acceleration.
For engineers reviewing the ATMEGA644RFR2-ZUR datasheet, ATMEGA644RFR2-ZUR pinout, ATMEGA644RFR2-ZUR application, or ATMEGA644RFR2-ZUR equivalent, key selection criteria include its integrated 2.4 GHz transceiver with -100 dBm RX sensitivity, hardware AES encryption, 32-bit IEEE 802.15.4 symbol counter, and support for ZigBee end-node roles in battery-powered deployments.
Technical Context
The ATMEGA644RFR2-ZUR combines an enhanced RISC AVR core executing 135 instructions (most in one cycle) with a fully integrated 2.4 GHz DSSS transceiver supporting 250 kb/s to 2 Mb/s data rates. Its hardware-assisted MAC includes auto-acknowledge, auto-retry, CRC-16 computation, and 32-bit symbol timing.
It integrates dual crystal oscillators (16 MHz for RF, 32.768 kHz for low-power timing), internal voltage regulation (AVDD/DVDD), dedicated RF ground pins (AVSS_RFP/AVSS_RFN), and supports seven ADC input channels with differential gain options - all within a 7×7 mm QFN48 package rated for -40°C to +125°C operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | AVR 8-bit RISC with 32 general-purpose registers and 2-cycle hardware multiplier |
| Flash / EEPROM / SRAM | 64 KB / 2 KB / 8 KB - enables full ZigBee stack plus application code with data logging |
| RF Data Rates | 250 kb/s, 500 kb/s, 1 Mb/s, 2 Mb/s - selectable per IEEE 802.15.4 PHY modes |
| RX Sensitivity / TX Power | -100 dBm / up to +3.5 dBm - ensures reliable link budget in mesh networks |
| Supply Current (Active) | 10.1 mA @ 1.8 V (CPU + RX_ON) - optimized for multi-year coin-cell operation |
| Deep Sleep Current | <700 nA @ 25°C - preserves battery life during extended idle periods |
| ADC Channels | 7 single-ended inputs - supports sensor interfacing without external mux |
| Operating Voltage | 1.8–3.6 V - compatible with Li-SOCl₂, alkaline, and rechargeable batteries |
Pinout & Package
ATMEGA644RFR2-ZUR uses a 48-pin QFN package (7×7 mm, RoHS-compliant) with exposed thermal pad internally connected to AVSS. The package supports 33 GPIO lines across Ports B, D, E, F, and G, plus dedicated RF I/O (RFP/RFN), analog/digital supply rails (EVDD/DEVDD/AVDD/DVDD), and dual crystal interfaces (XTAL1/XTAL2, PG3/PG4).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RFP / RFN | Differential RF I/O | 100 Ω balanced interface requiring external balun for 50 Ω antenna coupling |
| AVSS_RFP / AVSS_RFN | Dedicated RF Grounds | Isolated analog grounds minimize RF noise coupling into digital domains |
| XTAL1 / XTAL2 | 16 MHz RF Crystal Interface | Drives fractional-N PLL synthesizer with 5 MHz/500 kHz channel spacing |
| PG3 / PG4 | 32.768 kHz Crystal Interface | Feeds low-power oscillator for MAC symbol counter and RTC in deep sleep |
| TST / CLKI | Test & Clock Input | Mandatory connection points - TST to AVSS, CLKI to DVSS if unused |
| PE0 / PE1 | USART0 RX/TX | Primary debug interface; supports bootloader programming and host communication |
Key Features
| Feature | Design Value |
|---|---|
| Hardware AES-128 Engine | Enables secure over-the-air updates and encrypted ZigBee network layer traffic without CPU overhead |
| 32-bit IEEE 802.15.4 Symbol Counter | Provides precise MAC-layer timing for beacon scheduling and CSMA-CA coordination in low-power networks |
| Multiple PAN Address Filtering | Reduces CPU wake-ups by offloading address matching to hardware during packet reception |
| On-chip Voltage Regulators | AVDD/DVDD generation from EVDD/DEVDD simplifies power design and improves RF PSRR |
| Antenna Diversity Support | Allows dynamic RF path selection to mitigate multipath fading in indoor deployments |
| True Random Number Generator | Supplies cryptographically secure entropy for key generation and challenge-response protocols |
Applications
| Smart Utility Metering | ZigBee End-Device Sensor Node |
|---|---|
Use Scenario: Battery-powered gas/water meter transmitting consumption data hourly via ZigBee mesh to concentrator. IC Role / Device Role / Timing Role: ATMEGA644RFR2-ZUR acts as network processor and RF transceiver, using its 32.768 kHz oscillator for accurate timekeeping and MAC symbol counter for scheduled transmissions. Use Value: Deep sleep current <700 nA extends 10+ year battery life; hardware MAC reduces active time and firmware complexity. | Use Scenario: Wireless temperature/humidity sensor deployed in HVAC ducts with intermittent reporting. IC Role / Device Role / Timing Role: ATMEGA644RFR2-ZUR serves as end-node device with integrated ADC sampling sensors and transceiver handling IEEE 802.15.4 frame assembly and CRC-16 calculation. Use Value: 7-channel ADC eliminates external signal conditioning; -100 dBm RX sensitivity maintains link at long range despite metal enclosure attenuation. |
| Industrial Asset Tracking Tag | Wireless Lighting Control Node |
Use Scenario: Tamper-resistant BLE/ZigBee hybrid tag monitoring equipment location and vibration in factory settings. IC Role / Device Role / Timing Role: ATMEGA644RFR2-ZUR functions as low-power network processor, using hardware AES for secure join requests and true RNG for session keys. Use Value: Hardware security accelerates secure commissioning; 125°C rating ensures reliability near motors and drives. | Use Scenario: DALI-to-ZigBee gateway controlling LED luminaires in commercial buildings. IC Role / Device Role / Timing Role: ATMEGA644RFR2-ZUR operates as coordinator-capable node managing multiple end-devices, leveraging its 64 KB Flash for ZigBee Light Link stack and application logic. Use Value: Integrated transceiver and MCU eliminate inter-chip latency; 33 GPIO lines support DALI UART, status LEDs, and push-button inputs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar wireless microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ATMEGA1284RFR2-ZUR | 128 KB Flash, 4 KB EEPROM, 16 KB SRAM - double memory capacity | Supports larger ZigBee Pro stacks and routing functionality | Select when implementing coordinator/router roles requiring full network layer processing |
| ATMEGA2564RFR2-ZUR | 256 KB Flash, 8 KB EEPROM, 32 KB SRAM - triple memory vs. ATMEGA644RFR2-ZUR | Enables concurrent application + full ZigBee Pro + OTA update storage | Choose for large-scale mesh coordinators needing persistent storage and advanced security features |
Compared with ATMEGA1284RFR2-ZUR and ATMEGA2564RFR2-ZUR, the ATMEGA644RFR2-ZUR provides optimal cost and power efficiency for resource-constrained end-nodes, trading memory headroom for lower BOM cost and reduced active current - making it ideal for high-volume sensor deployments where stack size is bounded.
Availability
ATMEGA644RFR2-ZUR is available at Aetrix Electronics and suitable for smart utility metering, industrial asset tracking, wireless lighting control, and ZigBee end-node sensor applications requiring stable component supply across extended product lifecycles.
Supply support for ATMEGA644RFR2-ZUR 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 continues to develop, manufacture, and support the AVR wireless microcontroller portfolio including the ATMEGA644RFR2-ZUR.
The ATMEGA644RFR2-ZUR belongs to the ATmegaRFR2 family designed specifically for IEEE 802.15.4 and ZigBee end-node applications, integrating RF, security, and timing subsystems to minimize external components and power consumption in battery-operated IoT devices.
FAQ
What is the maximum transmit output power of the ATMEGA644RFR2-ZUR?
The ATMEGA644RFR2-ZUR 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 conditions (3.3 V supply, 25°C ambient). Actual radiated power depends on external balun and antenna matching; the transceiver includes hardware TX spectrum side-lobe suppression to meet regulatory spectral mask requirements.
Does the ATMEGA644RFR2-ZUR support hardware AES encryption?
Yes, the ATMEGA644RFR2-ZUR includes a dedicated hardware AES-128 engine compliant with FIPS-197. It performs encryption/decryption and key expansion independently of the AVR core, enabling secure ZigBee network layer operations and over-the-air updates without impacting real-time application execution. The engine interfaces directly with the transceiver's frame buffer for zero-copy secure packet processing.
How many ADC input channels does the ATMEGA644RFR2-ZUR provide?
The ATMEGA644RFR2-ZUR provides 7 single-ended ADC input channels (PF0–PF5, PF7) due to pin-sharing constraints in the QFN48 package - PF3 and PF4 share one physical pin. It supports differential measurements with programmable gain (1x, 10x, 200x) on selected channel pairs, and includes an on-chip temperature sensor accessible via ADC channel 8 (not pin-mapped but internally routed).
What crystal frequencies are required for the ATMEGA644RFR2-ZUR?
The ATMEGA644RFR2-ZUR requires two crystals: a 16 MHz fundamental-mode crystal on XTAL1/XTAL2 for the RF transceiver's PLL synthesizer, and a 32.768 kHz tuning-fork crystal on PG3/PG4 for the low-power asynchronous timer and IEEE 802.15.4 symbol counter. Load capacitance for the 16 MHz crystal is typically 12 pF; for the 32.768 kHz crystal, total shunt capacitance must not exceed 15 pF.
Is the ATMEGA644RFR2-ZUR pin-compatible with other ATmegaRFR2 variants?
Yes, the ATMEGA644RFR2-ZUR shares identical QFN48 pinout, electrical characteristics, and peripheral mapping with ATMEGA1284RFR2-ZUR and ATMEGA2564RFR2-ZUR. Memory size differences (64 KB/128 KB/256 KB Flash) do not affect pin function or timing behavior, enabling drop-in replacement in existing PCB layouts when scaling application complexity or firmware footprint.
ATMEGA644RFR2-ZUR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 48-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- TxRx + MCU
- RF Family/Standard:
- 802.15.4
- Protocol:
- Zigbee®
- Modulation:
- O-QPSK
- Frequency:
- 2.4GHz
- Data Rate (Max):
- 2Mbps
- Power - Output:
- 3.5dBm
- Sensitivity:
- -100dBm
- Memory Size:
- 64kB Flash, 2kB EEPROM, 8kB SRAM
- Serial Interfaces:
- I2C, JTAG, SPI, USART
- GPIO:
- 32
- Voltage - Supply:
- 1.8V ~ 3.6V
- Current - Receiving:
- 5mA ~ 12.5mA
- Current - Transmitting:
- 8mA ~ 14.5mA
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 48-QFN (7x7)
ATMEGA644RFR2-ZUR FAQ
1.How can I place an order for ATMEGA644RFR2-ZUR through Aetrix?
Please submit a Request for Quotation (RFQ) for ATMEGA644RFR2-ZUR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ATMEGA644RFR2-ZUR reliable?
The price and inventory of ATMEGA644RFR2-ZUR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ATMEGA644RFR2-ZUR is usually 5 days.
3.What payment methods are accepted for ATMEGA644RFR2-ZUR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ATMEGA644RFR2-ZUR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ATMEGA644RFR2-ZUR?
ATMEGA644RFR2-ZUR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ATMEGA644RFR2-ZUR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ATMEGA644RFR2-ZUR?
For technical support, including ATMEGA644RFR2-ZUR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ATMEGA644RFR2-ZUR requirements.
6.How does Aetrix verify that ATMEGA644RFR2-ZUR is sourced from the original manufacturer or authorized distributors?
All ATMEGA644RFR2-ZUR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ATMEGA644RFR2-ZUR meets industry standards.
7.What is the process for return or replacement of ATMEGA644RFR2-ZUR?
All ATMEGA644RFR2-ZUR units undergo pre-shipment inspection (PSI). If there is an issue with ATMEGA644RFR2-ZUR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ATMEGA644RFR2-ZUR part is unused and in its original packaging.
Return procedure for ATMEGA644RFR2-ZUR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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