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Microchip Technology ATMEGA644RFR2-ZFR
- Part No.:
- ATMEGA644RFR2-ZFR
- Manufacturer:
- Microchip Technology
- Category:
- RF Transceiver ICs
- Package:
- 48-VFQFN Exposed Pad
- Datasheet:
-
ATMEGA644RFR2-ZFR.pdf
- Description:
- IC RF TXRX+MCU 802.15.4 48QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,427
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Product details
Overview
ATMEGA644RFR2-ZFR 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 QFN-48 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. Used in battery-powered wireless sensor nodes requiring low-power RF communication and embedded control.
For engineers reviewing the ATMEGA644RFR2-ZFR datasheet, ATMEGA644RFR2-ZFR pinout, ATMEGA644RFR2-ZFR application, or ATMEGA644RFR2-ZFR equivalent, key selection criteria include its integrated 2.4 GHz transceiver RX sensitivity (−100 dBm), TX output power (up to +3.5 dBm), hardware-accelerated MAC, AES encryption engine, and deep-sleep current (<700 nA).
Technical Context
The ATMEGA644RFR2-ZFR combines an enhanced RISC AVR core with a fully integrated 2.4 GHz DSSS transceiver supporting IEEE 802.15.4-2011 and ZigBee protocols. Its architecture includes a fractional-N PLL synthesizer with 5 MHz/500 kHz channel spacing, hardware-assisted frame handling (CRC-16, auto-ack, auto-retry), and a 32-bit MAC symbol counter synchronized to a 32.768 kHz crystal oscillator.
Power management integrates six software-selectable sleep modes, including Deep Sleep (<700 nA), Power-save (asynchronous timer active), and ADC Noise Reduction mode. The transceiver uses differential RF I/O (RFP/RFN) with dedicated analog grounds (AVSS_RFP/AVSS_RFN), and supports data rates of 250 kb/s, 500 kb/s, 1 Mb/s, and 2 Mb/s.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | AVR 8-bit RISC CPU with 135 instructions; most execute in one cycle - enables deterministic real-time control at up to 16 MIPS @ 16 MHz. |
| Flash / EEPROM / SRAM | 64 KB Flash (ISP-programmable), 2 KB EEPROM (20k write/erase cycles @ 125°C), 8 KB SRAM - sufficient for ZigBee end-node stack + application logic. |
| RF Performance | −100 dBm RX sensitivity @ 250 kb/s; +3.5 dBm max TX output power - provides robust link budget for mesh network end devices. |
| Supply Current | CPU Active @ 16 MHz: 4.1 mA; Transceiver RX_ON: 6.0 mA; TX peak: 14.5 mA; Deep Sleep: <700 nA - enables multi-year operation on coin-cell batteries. |
| ADC & Timers | 10-bit, 8-channel SAR ADC (330 ks/s); 6 flexible Timer/Counters with PWM; Real Time Counter with 32.768 kHz oscillator - supports sensor interfacing and time-critical scheduling. |
| Security & Interface | Hardware AES-128 engine + true random number generator; JTAG (IEEE 1149.1), 2× USART, SPI, TWI - enables secure over-the-air updates and debug during development. |
| Operating Range | −40°C to +125°C industrial temperature range; 1.8–3.6 V supply - suitable for harsh environments without external voltage regulation. |
Pinout & Package
ATMEGA644RFR2-ZFR is housed in a 7×7 mm, 48-pad 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, plus dedicated RF (RFP/RFN), crystal (XTAL1/XTAL2), and power pins (EVDD, DEVDD, AVDD, DVDD, AVSS, DVSS, AVSS_RFP, AVSS_RFN).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RFP / RFN | Differential RF transceiver I/O | 100 Ω differential interface for 2.4 GHz ISM band; requires balun for single-ended antenna connection. |
| XTAL1 / XTAL2 | 16 MHz crystal oscillator input/output | Drives transceiver PLL reference; requires low-parasitic layout and 12 pF load capacitors for ±20 ppm stability. |
| PG3 / PG4 | 32.768 kHz crystal oscillator terminals | Supports ultra-low-power asynchronous timer and MAC symbol counter; total shunt capacitance ≤15 pF required. |
| PE0 / PE1 | USART0 RXD0 / TXD0 | Primary serial interface for bootloader, debugging, or host MCU communication; supports full-duplex at up to 2 Mbps. |
| PD0 / PD1 | Two-wire Serial Interface (TWI) | Compatible with I²C protocol; used for sensor or peripheral expansion with addressable slave devices. |
| PF0–PF7 | ADC0–ADC7 inputs | 8-channel 10-bit ADC with optional differential gain stage; PF0–PF2 are single-ended only in QFN-48 due to PF3/PF4 shared pin. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated IEEE 802.15.4 MAC | Hardware-accelerated frame filtering, CRC-16, auto-acknowledge, and auto-retry - offloads CPU and ensures reliable packet delivery. |
| Multi-PAN Address Filtering | Hardware-based filtering of up to 8 PAN IDs - enables coexistence in dense ZigBee deployments without CPU intervention. |
| Ultra-Low-Power Deep Sleep | <700 nA current draw with 32.768 kHz oscillator and MAC symbol counter active - preserves timing accuracy while minimizing battery drain. |
| On-Chip AES-128 Engine | Dedicated cryptographic accelerator with true random number generator - enables secure key exchange and payload encryption without software overhead. |
| Hardware Multiplier | 2-cycle 8×8 bit signed/unsigned multiplier - accelerates sensor fusion, PID control, and ZigBee stack arithmetic operations. |
Applications
| ZigBee End Node | Wireless Sensor Network |
|---|---|
Use Scenario: Battery-powered occupancy or temperature sensor deployed in smart building HVAC systems. IC Role / Device Role / Timing Role: Acts as IEEE 802.15.4 Reduced Function Device (RFD), performing sensor sampling, local decision logic, and periodic beaconed data transmission. Use Value: Integrated transceiver eliminates external RF IC and reduces BOM count; deep-sleep current extends battery life beyond 5 years on CR2032. |
Use Scenario: Distributed soil moisture and ambient light monitoring in precision agriculture field nodes. IC Role / Device Role / Timing Role: Serves as autonomous network processor, managing scheduled wake-up, multi-channel ADC acquisition, and adaptive duty cycling based on RSSI thresholds. Use Value: Hardware MAC and symbol counter enable precise time-synchronized sampling across hundreds of nodes without GPS or external clock sync. |
| Industrial Remote Control | Smart Home Actuator |
Use Scenario: Wireless push-button panel controlling lighting, blinds, or HVAC via ZigBee Green Power proxy. IC Role / Device Role / Timing Role: Functions as Green Power device with energy harvesting support, using wake-on-RX and ultra-fast TX burst capability. Use Value: Sub-1 µA deep-sleep current and hardware-assisted TX framing allow operation from piezoelectric or solar harvesters without supercapacitor buffering. |
Use Scenario: Smart plug or relay module integrating AC load switching, zero-crossing detection, and OTA firmware updates. IC Role / Device Role / Timing Role: Provides dual-role processing: real-time AC phase control via timer capture and secure ZigBee cluster command handling via hardware AES. Use Value: On-chip 10-bit ADC and high-current GPIO eliminate need for external sensing or level-shifting components, reducing PCB area by 30%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 2.4 GHz wireless microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ATMEGA1284RFR2-ZUR | 128 KB Flash, 4 KB EEPROM, 16 KB SRAM; identical RF subsystem and pinout. | Targeted for ZigBee routers/coordinators requiring larger stack memory and routing table storage. | Select when application demands >64 KB code space or extended network layer functionality beyond RFD capability. |
| CC2652R1F | ARM Cortex-M4F core, 352 KB Flash, integrated RF front-end, TI-RTOS support; no AVR instruction compatibility. | Designed for multi-protocol stacks (ZigBee, BLE, Thread, Matter) with higher throughput and cloud connectivity features. | Choose for new designs requiring Bluetooth LE coexistence, IPv6/6LoWPAN, or vendor-agnostic RTOS portability - not drop-in replacement. |
Compared with ATMEGA644RFR2-ZFR, the ATMEGA1284RFR2-ZUR offers double memory capacity while maintaining identical RF performance and pin compatibility, making it ideal for gateway-adjacent roles; the CC2652R1F provides broader protocol flexibility and higher compute headroom but requires full firmware re-architecture and board layout revision.
Availability
ATMEGA644RFR2-ZFR is available at Aetrix Electronics and suitable for wireless sensor nodes, ZigBee end-point devices, and industrial remote controls requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for ATMEGA644RFR2-ZFR 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 support for the AVR wireless portfolio. The company specializes in microcontrollers, analog, FPGA, and security solutions for industrial, automotive, and IoT markets.
The ATMEGA644RFR2-ZFR belongs to the Atmel AVR RFR2 family, designed specifically for ultra-low-power, standards-compliant 2.4 GHz wireless embedded applications where integration, battery life, and ZigBee/802.15.4 interoperability are critical.
FAQ
What is the maximum transmit output power of the ATMEGA644RFR2-ZFR?
The ATMEGA644RFR2-ZFR delivers up to +3.5 dBm TX output power in the 2.4 GHz ISM band. This value is measured under standard conditions (3.3 V supply, 250 kb/s data rate) and enables robust link budgets in mesh networks. Actual output may vary slightly depending on PCB layout, antenna matching, and operating voltage; refer to Section 3.2 of the 42073BS-MCU Wireless-09/14 datasheet for calibration guidance. The ATMEGA644RFR2-ZFR includes hardware registers to adjust TX power in discrete steps.
Does the ATMEGA644RFR2-ZFR support hardware AES encryption?
Yes, the ATMEGA644RFR2-ZFR integrates a dedicated hardware AES-128 engine with a true random number generator (TRNG). This allows secure key derivation, encrypted payload processing, and ZigBee Link Key establishment without CPU overhead or software vulnerability exposure. The TRNG meets NIST SP 800-90B entropy requirements and is accessible via dedicated I/O registers. The ATMEGA644RFR2-ZFR uses this engine for both network-layer and application-layer security in certified ZigBee implementations.
What is the function of the exposed thermal pad on the ATMEGA644RFR2-ZFR QFN package?
The exposed center pad on the ATMEGA644RFR2-ZFR's 7×7 mm QFN package is internally connected to AVSS and must be soldered to a corresponding copper pour on the PCB for mechanical stability and thermal dissipation. Leaving it unconnected risks solder joint fatigue and reduced RF performance due to ground loop impedance. The pad is not intended as a substitute for the 4 regular AVSS pins (pins 2, 5, 8, 13), all of which must also be properly routed. This requirement is explicitly stated in Figure 1-1 and Section 3.2.12–3.2.13 of the datasheet.
Can the ATMEGA644RFR2-ZFR operate without an external 16 MHz crystal?
No - the ATMEGA644RFR2-ZFR requires an external 16 MHz crystal connected between XTAL1 and XTAL2 to drive the 2.4 GHz transceiver's PLL synthesizer. While the AVR core can use an internal RC oscillator or CLKI input for low-speed operation, the radio subsystem mandates the 16 MHz crystal for frequency accuracy and IEEE 802.15.4 compliance. Omitting it disables RF functionality entirely. The ATMEGA644RFR2-ZFR datasheet specifies 12 pF load capacitors and strict layout rules (short traces, isolation from digital noise) for this crystal circuit.
How many ADC channels are available on the ATMEGA644RFR2-ZFR in the QFN-48 package?
The ATMEGA644RFR2-ZFR provides 7 single-ended ADC input channels (ADC0–ADC6) in the QFN-48 package. Although the datasheet lists 8 ADC channels (ADC0–ADC7), PF3 and PF4 share a single physical pin (pin 36), limiting usable single-ended inputs to 7. Differential ADC modes are supported but require specific pin pairings (e.g., ADC0/ADC1) and are constrained by the same pin-sharing limitation. This configuration is confirmed in Table 3-2 and Section 3.4.3 of the 42073BS-MCU Wireless-09/14 document.
ATMEGA644RFR2-ZFR 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 ~ 125°C
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 48-QFN (7x7)
ATMEGA644RFR2-ZFR FAQ
1.How can I place an order for ATMEGA644RFR2-ZFR through Aetrix?
Please submit a Request for Quotation (RFQ) for ATMEGA644RFR2-ZFR 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-ZFR reliable?
The price and inventory of ATMEGA644RFR2-ZFR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ATMEGA644RFR2-ZFR is usually 5 days.
3.What payment methods are accepted for ATMEGA644RFR2-ZFR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ATMEGA644RFR2-ZFR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ATMEGA644RFR2-ZFR?
ATMEGA644RFR2-ZFR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ATMEGA644RFR2-ZFR 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-ZFR?
For technical support, including ATMEGA644RFR2-ZFR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ATMEGA644RFR2-ZFR requirements.
6.How does Aetrix verify that ATMEGA644RFR2-ZFR is sourced from the original manufacturer or authorized distributors?
All ATMEGA644RFR2-ZFR 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-ZFR meets industry standards.
7.What is the process for return or replacement of ATMEGA644RFR2-ZFR?
All ATMEGA644RFR2-ZFR units undergo pre-shipment inspection (PSI). If there is an issue with ATMEGA644RFR2-ZFR, 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-ZFR part is unused and in its original packaging.
Return procedure for ATMEGA644RFR2-ZFR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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