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Microchip Technology ATMEGA644RFR2-ZF
- Part No.:
- ATMEGA644RFR2-ZF
- Manufacturer:
- Microchip Technology
- Category:
- RF Transceiver ICs
- Package:
- 48-VFQFN Exposed Pad
- Datasheet:
-
ATMEGA644RFR2-ZF.pdf
- Description:
- IC RF TXRX+MCU 802.15.4 48QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,714
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Product details
Overview
ATMEGA644RFR2-ZF from Microchip Technology (formerly Atmel) is an 8-bit AVR microcontroller integrated with a fully compliant IEEE 802.15.4-2011/2006/2003 and ZigBee-ready 2.4 GHz transceiver. It delivers 64 KB Flash, 2 KB EEPROM, 8 KB SRAM, 33 programmable I/O lines, and operates from 1.8–3.6 V at up to 16 MHz. Designed for ultra-low-power end-node wireless sensor applications including smart metering and industrial monitoring.
For engineers reviewing the ATMEGA644RFR2-ZF datasheet, ATMEGA644RFR2-ZF pinout, ATMEGA644RFR2-ZF application, or ATMEGA644RFR2-ZF equivalent, key selection criteria include its integrated MAC hardware acceleration, -100 dBm RX sensitivity, 3.5 dBm TX output power, deep-sleep current <700 nA, and QFN48 package compatibility with RF layout constraints.
Technical Context
The ATMEGA644RFR2-ZF combines an enhanced RISC CPU executing 135 instructions-most in one cycle-with a fully integrated 2.4 GHz transceiver featuring hardware-assisted MAC, AES encryption, and a 32-bit IEEE 802.15.4 symbol counter. Its dual-oscillator system uses external 16 MHz and 32.768 kHz crystals for high-speed operation and sub-µA real-time timing.
It implements a fractional-N PLL synthesizer with 5 MHz/500 kHz channel spacing, supports data rates of 250 kb/s to 2 Mb/s, and integrates dedicated RF ground pins (AVSS_RFP/AVSS_RFN), differential RF I/O (RFP/RFN), and on-chip voltage regulation for analog/digital domains. The device enables true Read-While-Write Flash programming via SPI or JTAG.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | AVR 8-bit RISC with 32 general-purpose registers and 2-cycle hardware multiplier - enables deterministic real-time control and efficient C compilation. |
| Flash / EEPROM / SRAM | 64 KB / 2 KB / 8 KB - sufficient for full ZigBee stack + application logic in resource-constrained end nodes without external memory. |
| Transceiver Performance | -100 dBm RX sensitivity, 3.5 dBm max TX output - ensures robust link budget in mesh networks with >100 m range in typical indoor environments. |
| Power Consumption | Deep Sleep: <700 nA @ 25°C; RX_ON: 6.0 mA; TX (max power): 14.5 mA - enables multi-year battery life in coin-cell-powered sensors. |
| ADC & Timing | 10-bit, 330 ks/s ADC with 7 single-ended channels; RTC with 32.768 kHz oscillator - supports precision analog sensing and low-power timekeeping. |
| Interface Support | 2 USARTs, SPI, TWI (2-wire), JTAG, and hardware AES engine - enables secure OTA updates, sensor interfacing, and debug during development and field deployment. |
| Operating Range | -40°C to +125°C, 1.8–3.6 V supply - qualified for industrial and outdoor embedded deployments without external thermal management. |
Pinout & Package
ATMEGA644RFR2-ZF is housed in a 48-pad, 7×7 mm RoHS-compliant QFN package with exposed thermal pad internally connected to AVSS. The center paddle must be soldered to PCB ground for mechanical stability and thermal performance; leaving it unconnected risks delamination.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RFP / RFN | Differential RF I/O terminals | Direct connection points for 100 Ω differential antenna interface; require balun conversion for 50 Ω single-ended designs. |
| AVSS_RFP / AVSS_RFN | Dedicated RF analog grounds | Isolated ground returns for RF circuitry to prevent digital noise coupling into sensitive receiver path. |
| XTAL1 / XTAL2 | 16 MHz crystal oscillator inputs | Drive external 16 MHz crystal for transceiver reference clock; routing must avoid digital crosstalk to maintain frequency stability. |
| PG3 / PG4 | 32.768 kHz crystal oscillator pins | Connect external low-power crystal for asynchronous timer and MAC symbol counter; total shunt capacitance ≤15 pF. |
| TST / CLKI | Test mode enable / clock input | Must be externally tied: TST to AVSS (if unused), CLKI to DVSS - floating states cause excessive leakage current. |
| PE0 / PE1 | USART0 RXD0 / TXD0 | Primary serial interface for host communication or bootloader; supports baud rates up to 2 Mbps with fractional baud generation. |
Key Features
| Feature | Design Value |
|---|---|
| Hardware MAC Acceleration | Auto-Acknowledge, Auto-Retry, CRC-16 computation, and SFD detection offload protocol stack processing from CPU - reduces latency and extends battery life. |
| Integrated Security Engine | Dedicated AES-128 hardware block and True Random Number Generator - enables secure key exchange and encrypted frame transmission without software overhead. |
| Multi-PAN Address Filtering | Hardware-assisted filtering of IEEE 802.15.4 PAN IDs - allows concurrent participation in multiple networks without CPU intervention. |
| Ultra-Low-Power Sleep Modes | Deep Sleep mode draws <700 nA while retaining MAC symbol counter and 32.768 kHz oscillator - maintains network time synchronization during extended sleep. |
| On-Chip Voltage Regulation | Separate internal AVDD/DVDD regulators from EVDD/DEVDD supplies - simplifies power design and improves noise immunity between analog RF and digital domains. |
Applications
| Smart Utility Metering | ZigBee End-Device Sensor Node |
|---|---|
|
Use Scenario: Battery-powered gas/water/electricity meters transmitting consumption data hourly over ZigBee mesh to concentrators. IC Role / Device Role / Timing Role: Full-function end-device node executing ZigBee SE 1.1 profile, managing RF link, sensor reads, and secure OTA updates. Use Value: Integrated transceiver and crypto engine eliminate discrete RF IC and security co-processor - reducing BOM count, PCB area, and certification effort. |
Use Scenario: Wireless temperature/humidity/occupancy sensors deployed in commercial HVAC systems with multi-year battery life requirements. IC Role / Device Role / Timing Role: Low-power sensor hub aggregating analog readings, performing local threshold logic, and transmitting compressed frames via IEEE 802.15.4. Use Value: Deep-sleep current <700 nA and hardware RTC enable precise wake-up scheduling - extending CR2032 battery life beyond 5 years. |
| Industrial Wireless Monitoring | Home Automation Controller |
|
Use Scenario: Corrosion-resistant enclosure housing vibration, pressure, and ambient condition sensors in factory-floor machinery monitoring. IC Role / Device Role / Timing Role: Ruggedized edge node performing local FFT preprocessing, event-triggered reporting, and adaptive duty cycling. Use Value: -40°C to +125°C rating and integrated voltage regulation allow direct mounting near motors/valves without external thermal buffering or LDOs. |
Use Scenario: Compact wall-mounted gateway coordinating lights, thermostats, and door locks using ZigBee HA 1.2 profiles. IC Role / Device Role / Timing Role: Network processor handling MAC layer, security, and inter-cluster messaging - offloading complexity from higher-layer MCU. Use Value: Hardware AES and MAC acceleration reduce firmware size and CPU load - enabling cost-effective dual-core architecture where ATMEGA644RFR2-ZF handles PHY/MAC only. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit 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; identical QFN48 pinout and RF subsystem. | Supports larger ZigBee coordinator/router stacks; not suitable when footprint or cost sensitivity demands minimal memory. | Select when running full ZigBee Pro stack or requiring local data buffering; verify PCB layout accommodates same thermal pad soldering. |
| CC2652R1F | ARM Cortex-M4F core, 352 KB Flash, integrated BLE 5.0 + IEEE 802.15.4 radio, lower RX sensitivity (-102 dBm), higher TX power (+5 dBm). | Targets dual-mode (BLE + ZigBee) gateways; requires different toolchain, lacks AVR instruction set compatibility. | Choose for future-proofing with ARM ecosystem or multi-protocol support; not drop-in compatible due to architecture, pinout, and power domain differences. |
Compared with ATMEGA644RFR2-ZF, ATMEGA1284RFR2-ZUR offers scalable memory within identical RF and packaging constraints, while CC2652R1F provides modern ARM-based multi-protocol capability at the cost of architectural discontinuity and higher system integration effort.
Availability
ATMEGA644RFR2-ZF is available at Aetrix Electronics and suitable for smart metering, industrial sensor networks, home automation controllers, and battery-powered IoT endpoints requiring stable component supply across long production lifecycles.
Supply support for ATMEGA644RFR2-ZF 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 manufacture, qualify, and support the AVR wireless microcontroller portfolio under full product change notification discipline.
The ATMEGA644RFR2-ZF belongs to the legacy Atmel RFR2 family designed specifically for cost-sensitive, ultra-low-power IEEE 802.15.4 end-node applications - emphasizing integrated RF, deterministic real-time control, and industrial-grade reliability.
FAQ
What is the maximum transmit output power of the ATMEGA644RFR2-ZF?
The ATMEGA644RFR2-ZF achieves up to +3.5 dBm TX output power in the 2.4 GHz ISM band. This value is measured at the RFP/RFN differential ports under standard test conditions (3.3 V supply, 25°C). Actual radiated power depends on external balun and antenna matching; the device includes hardware TX spectrum side-lobe suppression to meet FCC/ETSI spectral mask requirements.
Does the ATMEGA644RFR2-ZF support over-the-air (OTA) firmware updates?
Yes, the ATMEGA644RFR2-ZF supports secure OTA updates via its integrated 2.4 GHz transceiver and hardware AES engine. The bootloader can reside in protected flash sections and use the USART or RF interface to receive encrypted firmware images, verify integrity via CRC-16 and AES-GCM, then reprogram application flash using ISP functionality - all without external programming hardware.
What crystal configurations are required for full ATMEGA644RFR2-ZF operation?
The ATMEGA644RFR2-ZF requires two crystals: a 16 MHz fundamental-mode crystal across XTAL1/XTAL2 for the transceiver PLL reference, and a 32.768 kHz tuning-fork crystal across PG3/PG4 for the asynchronous timer and MAC symbol counter. Load capacitance for the 16 MHz crystal is typically 12 pF; total shunt capacitance for the 32.768 kHz crystal must not exceed 15 pF.
How many ADC input channels are accessible on the ATMEGA644RFR2-ZF in QFN48 package?
The ATMEGA644RFR2-ZF provides 7 single-ended ADC input channels in the QFN48 package (PF0–PF5, PF7). Port F3 and F4 share a single pin, reducing the total usable ADC inputs from the theoretical 8 to 7. The AREF pin is not bonded out, so the ADC reference is fixed to AVDD; no external reference voltage option is available.
Is JTAG debugging supported on the ATMEGA644RFR2-ZF, and what pins are used?
Yes, JTAG debugging is fully supported on the ATMEGA644RFR2-ZF per IEEE 1149.1. It uses PF7 (TDI), PF6 (TDO), PF5 (TMS), and PE7 (TCK) - all accessible on the QFN48 package. Enabling JTAG requires programming the JTAGEN fuse; note that PF3/PF4 share a pin, so JTAG usage disables the DIG4 alternate function on PF3 unless configured carefully per datasheet section 3.4.3.
ATMEGA644RFR2-ZF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 48-VFQFN Exposed Pad
- Packaging:
- Tray
- 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-ZF FAQ
1.How can I place an order for ATMEGA644RFR2-ZF through Aetrix?
Please submit a Request for Quotation (RFQ) for ATMEGA644RFR2-ZF 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-ZF reliable?
The price and inventory of ATMEGA644RFR2-ZF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ATMEGA644RFR2-ZF is usually 5 days.
3.What payment methods are accepted for ATMEGA644RFR2-ZF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ATMEGA644RFR2-ZF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ATMEGA644RFR2-ZF?
ATMEGA644RFR2-ZF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ATMEGA644RFR2-ZF 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-ZF?
For technical support, including ATMEGA644RFR2-ZF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ATMEGA644RFR2-ZF requirements.
6.How does Aetrix verify that ATMEGA644RFR2-ZF is sourced from the original manufacturer or authorized distributors?
All ATMEGA644RFR2-ZF 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-ZF meets industry standards.
7.What is the process for return or replacement of ATMEGA644RFR2-ZF?
All ATMEGA644RFR2-ZF units undergo pre-shipment inspection (PSI). If there is an issue with ATMEGA644RFR2-ZF, 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-ZF part is unused and in its original packaging.
Return procedure for ATMEGA644RFR2-ZF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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