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Microchip Technology ATMEGA128RFR2-ZUR
- Part No.:
- ATMEGA128RFR2-ZUR
- Manufacturer:
- Microchip Technology
- Category:
- RF Transceiver ICs
- Package:
- 64-VFQFN Exposed Pad
- Datasheet:
-
ATMEGA128RFR2-ZUR.pdf
- Description:
- IC RF TXRX+MCU 802.15.4 64QFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
ATMEGA128RFR2-ZUR from Microchip Technology (formerly Atmel) is an 8-bit AVR microcontroller with integrated 2.4 GHz IEEE 802.15.4/ZigBee transceiver, delivering 128 KB Flash, 4 KB EEPROM, 16 KB SRAM, and 38 programmable I/O lines in a 64-pin QFN package. It operates from 1.8–3.6 V, supports 250 kb/s–2 Mb/s data rates, achieves −100 dBm RX sensitivity, and delivers up to +3.5 dBm TX output power. It targets low-power wireless sensor networks and ZigBee coordinator/router applications.
For engineers reviewing the ATMEGA128RFR2-ZUR datasheet, ATMEGA128RFR2-ZUR pinout, ATMEGA128RFR2-ZUR application, or ATMEGA128RFR2-ZUR equivalent, key selection considerations include its monolithic 2.4 GHz transceiver integration, hardware-assisted MAC (auto-acknowledge/retry), AES security engine, 32-bit IEEE 802.15.4 symbol counter, and deep-sleep current <700 nA at 25°C - all critical for battery-powered mesh networking designs.
Technical Context
The ATMEGA128RFR2-ZUR integrates an enhanced RISC AVR core with a fully featured 2.4 GHz DSSS transceiver on a single die. Its architecture includes a fractional-N PLL synthesizer with 5 MHz/500 kHz channel spacing, dedicated RF I/O pins (RFP/RFN), separate 32.768 kHz and 16 MHz crystal oscillators, and hardware-accelerated IEEE 802.15.4 frame handling including CRC-16, SFD detection, spreading/despreading, and 128-byte TX/RX frame buffers.
Power management combines six software-selectable sleep modes with integrated voltage regulation (DVDD/AVDD generation), enabling ultra-low leakage in Deep Sleep (<700 nA) while maintaining RTC, MAC symbol counter, and 32.768 kHz oscillator operation. The transceiver supports antenna diversity via PG1/PG2 and RX/TX indicators via PG0/PF3, and features phase measurement support for advanced RF diagnostics.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | AVR 8-bit RISC with 135 instructions; most execute in one cycle - enables high code efficiency and deterministic timing for real-time wireless protocols. |
| Flash / EEPROM / SRAM | 128 KB Flash (in-system programmable), 4 KB EEPROM (20k write/erase cycles @ 125°C), 16 KB SRAM - sufficient for full ZigBee stack plus application logic without external memory. |
| Transceiver Data Rates | 250 kb/s, 500 kb/s, 1 Mb/s, 2 Mb/s - supports both legacy IEEE 802.15.4-2003 and high-throughput 6LoWPAN/IPv6 deployments. |
| RX Sensitivity / TX Power | −100 dBm sensitivity at 250 kb/s; +3.5 dBm max output - provides robust link budget for indoor mesh networks with >100 m range. |
| Supply Current (Active) | CPU @ 16 MHz: 4.1 mA; Transceiver RX_ON: 6.0 mA; TX peak: 14.5 mA - enables multi-year battery life in duty-cycled sensor nodes. |
| Deep Sleep Current | <700 nA @ 25°C with MAC symbol counter and 32.768 kHz oscillator active - preserves network timekeeping and wake-up scheduling during extended idle periods. |
| Operating Voltage / Temp | 1.8–3.6 V supply; −40°C to +125°C industrial grade - suitable for unregulated battery systems and harsh environmental deployments. |
Pinout & Package
ATMEGA128RFR2-ZUR uses a 64-pad QFN package (RoHS-compliant, fully green) with exposed metal thermal pad internally connected to AVSS. The pad must be soldered to PCB ground for mechanical stability and thermal performance; leaving it unconnected risks package detachment.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RFP / RFN | Differential RF I/O port | 100 Ω differential interface for 2.4 GHz transceiver; requires external balun for single-ended antenna connection. |
| XTAL1 / XTAL2 | 16 MHz crystal oscillator terminals | Drive internal fractional-N PLL for transceiver frequency synthesis; layout requires short, noise-isolated traces. |
| TST / CLKI | Test mode enable / clock input | TST must be tied low if unused; CLKI allows external clock injection for microcontroller operation independent of RF oscillator. |
| EVDD / DEVDD | Analog/digital external supply inputs | Accept 1.8–3.6 V; feed internal regulators generating AVDD/DVDD - decoupling capacitors required per datasheet layout guidelines. |
| AVSS_RFP / AVSS_RFN | Dedicated RF ground returns | Separate analog ground paths for RF section - essential for minimizing noise coupling into sensitive receiver front-end. |
| PG0 / PF3 | DIG3 / DIG4 (RX/TX indicator) | GPIOs configurable as hardware-driven transceiver activity flags - simplifies LED signaling without CPU intervention. |
Key Features
| Feature | Design Value |
|---|---|
| Hardware-assisted MAC | Auto-acknowledge, auto-retry, and 32-bit IEEE 802.15.4 symbol counter offload protocol timing and reliability from firmware - reduces CPU load and jitter in time-critical mesh routing. |
| AES encryption engine | Dedicated hardware AES-128 accelerator with true random number generator - enables secure over-the-air updates and end-to-end payload encryption without compromising real-time throughput. |
| Multiple sleep modes | Six selectable power states including Deep Sleep (<700 nA), Power-save (asynchronous timer active), and ADC Noise Reduction - allows precise energy budgeting across sensor sampling, radio listen, and transmit phases. |
| Integrated crystal oscillators | On-chip 32.768 kHz low-power oscillator and 16 MHz RF reference oscillator - eliminates two external crystals, reducing BOM count and PCB area in space-constrained modules. |
| Antenna diversity support | Hardware-controlled RF switch control via PG1/PG2 - enables automatic antenna selection to mitigate multipath fading in dynamic RF environments. |
Applications
| ZigBee Coordinator | Industrial Sensor Node |
|---|---|
Use Scenario: Central node managing network formation, routing, and security policy enforcement in a factory-floor wireless sensor network. IC Role / Device Role / Timing Role: Full-function ZigBee coordinator running ZDO and APS layers; maintains 32-bit MAC symbol counter for precise timestamping of incoming frames. Use Value: 128 KB Flash accommodates full ZigBee Pro stack plus custom application logic; hardware MAC ensures deterministic ACK timing under heavy traffic load. | Use Scenario: Battery-powered temperature/humidity monitor deployed in HVAC ducts with 10-year lifetime requirement. IC Role / Device Role / Timing Role: End-device performing periodic ADC sampling, local processing, and scheduled 802.15.4 beacon transmissions. Use Value: Deep Sleep current <700 nA extends battery life; integrated 32.768 kHz oscillator enables accurate sleep/wake scheduling without external RTC. |
| Smart Home Hub | Wireless HART Field Device |
Use Scenario: Residential gateway bridging ZigBee devices to Wi-Fi/Ethernet, requiring concurrent protocol stacks and secure OTA updates. IC Role / Device Role / Timing Role: Dual-role device acting as ZigBee coordinator and IPv6/6LoWPAN border router; AES engine secures firmware images during update. Use Value: Hardware AES-128 acceleration enables fast, low-power decryption of signed firmware packages - critical for field-deployed security compliance. | Use Scenario: Intrinsically safe pressure transmitter in hazardous oil/gas environments requiring WirelessHART certification and long maintenance intervals. IC Role / Device Role / Timing Role: WirelessHART device implementing TDMA scheduling, channel hopping, and redundant transmission using hardware symbol counter and frame buffering. Use Value: 128-byte TX/RX frame buffers and hardware CRC-16 reduce firmware overhead; industrial temp range (−40°C to +125°C) ensures reliability in extreme ambient conditions. |
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 |
|---|---|---|---|
| ATMEGA256RFR2-ZUR | 256 KB Flash, 8 KB EEPROM, 32 KB SRAM - double memory capacity vs. ATMEGA128RFR2-ZUR | Targeted at large network coordinators/routers requiring full ZigBee Pro stack and extensive application storage | Select when firmware footprint exceeds 128 KB or when future-proofing for feature expansion is required. |
| ATMEGA64RFR2-ZUR | 64 KB Flash, 2 KB EEPROM, 8 KB SRAM - half the memory and reduced peripheral set | Optimized for simple end-node devices with minimal protocol stack requirements | Select for cost-sensitive, low-complexity sensor endpoints where memory headroom is not needed. |
Compared with ATMEGA256RFR2-ZUR and ATMEGA64RFR2-ZUR, the ATMEGA128RFR2-ZUR offers balanced memory (128 KB Flash/4 KB EEPROM), making it optimal for mid-tier ZigBee coordinators and routers that require full protocol support without over-provisioning silicon resources - delivering best-in-class cost-per-feature for industrial mesh deployments.
Availability
ATMEGA128RFR2-ZUR is available at Aetrix Electronics and suitable for industrial sensor networks, smart home hubs, and wireless building automation systems requiring stable component supply and long-term lifecycle assurance.
Supply support for ATMEGA128RFR2-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 now manufactures and supports the ATMEGA128RFR2-ZUR. Microchip is a global leader in microcontrollers, analog, FPGA, and connectivity solutions.
The ATMEGA128RFR2-ZUR belongs to Microchip's legacy AVR wireless MCU family, designed specifically for ultra-low-power IEEE 802.15.4 and ZigBee-compliant embedded wireless applications - emphasizing integration, security, and battery longevity.
FAQ
What is the maximum TX output power of the ATMEGA128RFR2-ZUR transceiver?
The ATMEGA128RFR2-ZUR transceiver delivers up to +3.5 dBm maximum output power in the 2.4 GHz ISM band. This value is achieved under specified operating conditions (3.0 V supply, 25°C ambient) and enables robust link budgets for indoor mesh networking. Actual output is configurable in firmware and depends on PA bias settings and matching network design per the reference schematic.
Does the ATMEGA128RFR2-ZUR support hardware AES encryption?
Yes, the ATMEGA128RFR2-ZUR includes a dedicated hardware AES-128 encryption engine and true random number generator. This enables secure over-the-air updates, encrypted payload transmission, and cryptographic key derivation without consuming CPU cycles or increasing latency - a critical capability for ZigBee SE and WirelessHART implementations requiring FIPS-level security.
What are the supported data rates for the ATMEGA128RFR2-ZUR transceiver?
The ATMEGA128RFR2-ZUR supports four discrete data rates: 250 kb/s, 500 kb/s, 1 Mb/s, and 2 Mb/s. These align with IEEE 802.15.4-2011 O-QPSK PHY modes and allow trade-offs between range (lower rates), throughput (higher rates), and power consumption. Rate selection is controlled via register configuration and affects modulation, spreading factor, and symbol timing.
How many GPIO pins does the ATMEGA128RFR2-ZUR provide?
The ATMEGA128RFR2-ZUR provides 38 programmable I/O lines across Ports B, D, E, F, and G. Port A and Port C are omitted per the RFR2 architecture, but remaining ports retain original register mapping for software compatibility with ATmega1281/2561. All GPIOs support internal pull-ups and multiple alternate functions including UART, SPI, TWI, timers, and ADC inputs.
What is the minimum deep-sleep current specification for the ATMEGA128RFR2-ZUR?
The ATMEGA128RFR2-ZUR achieves a deep-sleep current of less than 700 nA at 25°C when configured with the MAC symbol counter and 32.768 kHz oscillator active. This ultra-low leakage enables decade-scale battery life in intermittently active sensor nodes. The value assumes proper PCB layout, no floating pins, and disabled unused peripherals per datasheet recommendations.
ATMEGA128RFR2-ZUR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 64-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:
- DSSS, O-QPSK
- Frequency:
- 2.4GHz
- Data Rate (Max):
- 2Mbps
- Power - Output:
- 3.5dBm
- Sensitivity:
- -100dBm
- Memory Size:
- 128kB Flash, 4kB EEPROM, 16kB SRAM
- Serial Interfaces:
- I2C, JTAG, SPI, USART
- GPIO:
- 35
- 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:
- 64-QFN (9x9)
ATMEGA128RFR2-ZUR FAQ
1.How can I place an order for ATMEGA128RFR2-ZUR through Aetrix?
Please submit a Request for Quotation (RFQ) for ATMEGA128RFR2-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 ATMEGA128RFR2-ZUR reliable?
The price and inventory of ATMEGA128RFR2-ZUR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ATMEGA128RFR2-ZUR is usually 5 days.
3.What payment methods are accepted for ATMEGA128RFR2-ZUR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ATMEGA128RFR2-ZUR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ATMEGA128RFR2-ZUR?
ATMEGA128RFR2-ZUR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ATMEGA128RFR2-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 ATMEGA128RFR2-ZUR?
For technical support, including ATMEGA128RFR2-ZUR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ATMEGA128RFR2-ZUR requirements.
6.How does Aetrix verify that ATMEGA128RFR2-ZUR is sourced from the original manufacturer or authorized distributors?
All ATMEGA128RFR2-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 ATMEGA128RFR2-ZUR meets industry standards.
7.What is the process for return or replacement of ATMEGA128RFR2-ZUR?
All ATMEGA128RFR2-ZUR units undergo pre-shipment inspection (PSI). If there is an issue with ATMEGA128RFR2-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 ATMEGA128RFR2-ZUR part is unused and in its original packaging.
Return procedure for ATMEGA128RFR2-ZUR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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