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Microchip Technology ATMEGA1281R212-MU
- Part No.:
- ATMEGA1281R212-MU
- Manufacturer:
- Microchip Technology
- Category:
- RF Transceiver ICs
- Package:
- 64-TQFP
- Datasheet:
-
ATMEGA1281R212-MU.pdf
- Description:
- IC RF TXRX+MCU 802.15.4 64TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:135
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Product details
Overview
ATMEGA1281R212-MU from Microchip Technology is a high-performance, low-power 8-bit AVR microcontroller featuring 128KB in-system programmable Flash, 4KB EEPROM, 8KB SRAM, 54 programmable I/O lines, and operation up to 16MHz at 4.5–5.5V. It integrates six flexible Timer/Counters, two USARTs, an 8-channel 10-bit ADC, JTAG debugging, and QTouch® capacitive touch support - deployed in industrial motor control and embedded HMI systems.
For engineers reviewing the ATMEGA1281R212-MU datasheet, ATMEGA1281R212-MU pinout, ATMEGA1281R212-MU application, or ATMEGA1281R212-MU equivalent, key selection considerations include its 64-pin QFN/MLF package, 128KB Flash with boot section lock bits, 8-channel ADC with differential gain options, JTAG-based on-chip debug, and verified compatibility with QTouch® library for robust capacitive sensing.
Technical Context
The ATMEGA1281R212-MU implements an enhanced Harvard RISC architecture with 32 general-purpose 8-bit registers directly coupled to a single-cycle ALU and 2-cycle hardware multiplier. Its CPU executes 135 instructions - most in one clock cycle - achieving up to 16 MIPS at 16MHz.
It supports true Read-While-Write Flash programming via on-chip boot loader or JTAG interface, features six software-selectable sleep modes (including Power-down at 0.1µA @ 1.8V), and integrates peripheral modules including RTC, analog comparator, SPI, TWI, and four PWM channels with programmable resolution (2–16 bits).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | AVR 8-bit RISC with 32 × 8-bit general purpose registers and single-cycle ALU execution |
| Flash Memory | 128KB In-System Self-Programmable Flash with independent boot section lock bits |
| SRAM / EEPROM | 8KB internal SRAM; 4KB EEPROM rated for 100,000 write/erase cycles and 100-year data retention at 25°C |
| ADC | 8-channel, 10-bit successive approximation ADC with optional differential input and programmable gain |
| Timers / PWM | Two 8-bit + four 16-bit Timer/Counters; six PWM channels (four 8-bit + two 16-bit) with configurable resolution |
| Communication | Two USARTs, Master/Slave SPI, byte-oriented 2-wire (TWI/I²C), JTAG (IEEE 1149.1) for debug and programming |
| Operating Range | -40°C to +85°C industrial temperature range; 2.7–5.5V supply voltage; 0–16MHz max frequency at 4.5–5.5V |
Pinout & Package
ATMEGA1281R212-MU is housed in a 64-pad QFN/MLF package (7mm × 7mm, 0.5mm pitch) with exposed thermal pad internally connected to GND. Pin assignments follow the ATmega1281-specific layout shown in Figure 1-3 of DS40002211A, supporting 54 general-purpose I/O lines plus dedicated power, clock, reset, and peripheral function pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PA0–PA7 | Port A bidirectional I/O / ADC0–ADC7 | 8-bit port with internal pull-ups; serves as analog inputs for first 8 ADC channels |
| PF0–PF7 | Port F bidirectional I/O / ADC0–ADC7 / JTAG TDI/TDO/TMS/TCK | Dual-function port: primary analog input bank; also provides JTAG boundary-scan signals when enabled |
| PE0–PE7 | Port E bidirectional I/O / USART0 / INT4–INT7 / OC3A–OC3C | USART0 serial interface (RXD0/TXD0), external interrupt sources, and 16-bit Timer3 output compare outputs |
| PD0–PD7 | Port D bidirectional I/O / USART1 / INT0–INT3 / T0/T1 | USART1 interface, external interrupts, and 8-bit Timer0/Timer1 counter inputs |
| PB0–PB7 | Port B bidirectional I/O / SPI / OC0A–OC2B | SPI master/slave interface (SS/SCK/MOSI/MISO) and multiple PWM outputs across three timers |
| PG0–PG5 | Port G 6-bit I/O / RD/WR/ALE/OC0B/TOSC1/TOSC2 | External memory interface control (RD/WR/ALE), timer oscillator inputs, and OC0B PWM output |
| RESET | Active-low reset input | Minimum pulse width defined in "System and Reset Characteristics"; resets CPU and peripherals while preserving SRAM contents |
| XTAL1/XTAL2 | Crystal oscillator input/output | Supports external crystal (0.4–16MHz), ceramic resonator, or external clock source for system timing |
| AVCC/AREF/GND/VCC | Analog power / reference / ground / digital supply | AVCC must be externally connected to VCC (filtered if ADC used); AREF sets ADC reference voltage |
Key Features
| Feature | Design Value |
|---|---|
| True Read-While-Write Flash | Enables firmware updates without halting application code execution - critical for field-upgradable industrial controllers |
| JTAG Debug Interface | Provides full boundary-scan testing, real-time on-chip debugging, and non-invasive Flash/EEPROM/fuse programming |
| QTouch® Library Support | Enables robust capacitive touch button/slider/wheel implementation with Adjacent Key Suppression (AKS®) and hardware-accelerated acquisition |
| Ultra-Low Power Modes | Power-down mode draws only 0.1µA @ 1.8V; Power-save mode maintains RTC operation while freezing CPU and most peripherals |
| Flexible Timer System | Four 16-bit timers with capture, compare, and PWM capabilities - supports precise motor phase control and encoder counting |
Applications
| Industrial Motor Control | Embedded Human-Machine Interface (HMI) |
|---|---|
Use Scenario: Closed-loop control of BLDC motors in factory automation drives using Hall-effect or encoder feedback. IC Role / Device Role / Timing Role: Primary MCU executing PID algorithms, generating 6-channel complementary PWM for gate drivers, and managing CAN/RS-485 communication. Use Value: Sixteen-bit Timer4/5 with input capture and dead-time insertion enables precise commutation timing; 128KB Flash accommodates dual-bank firmware for safe OTA updates. |
Use Scenario: Touch-enabled control panel for HVAC or medical device with graphical LCD and audio feedback. IC Role / Device Role / Timing Role: Central controller handling capacitive touch sensing, display refresh, button debouncing, and local alarm logic. Use Value: Integrated QTouch® support offloads touch processing from main CPU; 8-channel ADC monitors thermistors and potentiometers without external components. |
| Smart Energy Metering | Programmable Logic Controller (PLC) I/O Module |
Use Scenario: Residential energy meter with current/voltage sensing, tariff switching, and secure data logging. IC Role / Device Role / Timing Role: Data acquisition engine sampling metrology ADCs, computing RMS/THD, storing tamper logs in EEPROM, and communicating via optical UART or RF. Use Value: 10-bit ADC with differential input and programmable gain achieves >90dB SNR for precision current measurement; EEPROM endurance ensures 10+ years of daily log writes. |
Use Scenario: DIN-rail mounted digital I/O expansion module with isolated inputs/outputs and Modbus RTU over RS-485. IC Role / Device Role / Timing Role: Protocol handler and GPIO manager interfacing with optocouplers, relay drivers, and RS-485 transceivers. Use Value: Two hardware USARTs enable simultaneous Modbus RTU and debug console; 54 I/O lines support 32-channel discrete I/O with configurable pull-ups and interrupt-on-change. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ATMEGA1280-16AU | 100-pin TQFP package; 86 I/O lines; 12-channel ADC; four USARTs; 12× 16-bit PWM channels | Supports larger I/O count and higher peripheral density - suited for complex control boards requiring multiple serial interfaces and expanded analog monitoring | Select ATMEGA1280-16AU when board space allows larger package and design requires >54 I/O or additional USART/ADC resources. |
| ATMEGA2561-16MU | Same 64-pin QFN/MLF package; 256KB Flash; identical I/O count, ADC, and peripheral set as ATMEGA1281R212-MU | Enables larger firmware images and future-proofing for feature-rich upgrades without PCB redesign | Choose ATMEGA2561-16MU where long-term firmware scalability is required and 256KB Flash utilization justifies cost premium. |
Compared with ATMEGA1280-16AU, ATMEGA1281R212-MU offers identical core functionality in a compact 64-pin QFN but trades I/O count and USART count for space efficiency; versus ATMEGA2561-16MU, it delivers identical footprint and peripheral compatibility at lower Flash capacity - ideal for cost-sensitive, volume-manufactured control modules.
Availability
ATMEGA1281R212-MU is available at Aetrix Electronics and suitable for industrial motor control, embedded HMI, smart metering, and PLC I/O modules requiring stable component supply, long lifecycle assurance, and RoHS-compliant packaging.
Supply support for ATMEGA1281R212-MU 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 is a global semiconductor company specializing in microcontrollers, analog devices, and Flash-IP solutions, with leadership in embedded control and low-power design.
The ATMEGA1281R212-MU belongs to the AVR megaAVR® family, engineered for cost-effective, high-reliability embedded applications demanding deterministic real-time performance, integrated analog peripherals, and field-upgradable firmware.
FAQ
What is the maximum operating frequency of the ATMEGA1281R212-MU?
The ATMEGA1281R212-MU operates up to 16MHz at 4.5–5.5V supply voltage. At lower voltages (2.7–5.5V), its maximum frequency is 8MHz. This speed grade is confirmed in the DS40002211A datasheet Section "Speed Grade" and defines the upper limit for instruction throughput and peripheral timing accuracy in designs using ATMEGA1281R212-MU.
Does the ATMEGA1281R212-MU support capacitive touch sensing?
Yes, the ATMEGA1281R212-MU is fully supported by Microchip's QTouch® Library for capacitive touch buttons, sliders, and wheels. It leverages the device's ADC and internal charge-transfer circuitry to deliver robust, noise-immune sensing with Adjacent Key Suppression (AKS®). The QTouch® integration is documented in Section 6 and Appendix A of the ATMEGA1281R212-MU datasheet.
What debug and programming interfaces does the ATMEGA1281R212-MU provide?
The ATMEGA1281R212-MU provides IEEE 1149.1-compliant JTAG interface for boundary-scan testing, on-chip debugging, and programming of Flash, EEPROM, fuses, and lock bits. It also supports ISP via SPI for in-system programming using external programmers. Both interfaces are validated in the ATMEGA1281R212-MU datasheet Sections 2.3.8 and "JTAG Interface".
How many ADC channels does the ATMEGA1281R212-MU have, and what is their resolution?
The ATMEGA1281R212-MU features an 8-channel, 10-bit successive approximation ADC. Channels are mapped across Port A (PA0–PA7) and Port F (PF0–PF7), with differential input capability and programmable gain options. This specification is explicitly stated in Table 2-1 and Section 2.3.3 of the official ATMEGA1281R212-MU datasheet.
Is the ATMEGA1281R212-MU pin-compatible with other ATmega128x variants?
The ATMEGA1281R212-MU shares the same 64-pin QFN/MLF package and pinout with ATMEGA2561-16MU, enabling direct substitution where Flash size requirements allow. It is not pin-compatible with 100-pin variants like ATMEGA1280-16AU due to differing pin counts and signal allocations - confirmed in Figures 1-1 and 1-3 of DS40002211A.
ATMEGA1281R212-MU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 64-TQFP
- Packaging:
- Tray
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- TxRx + MCU
- RF Family/Standard:
- 802.15.4, General ISM < 1GHz
- Protocol:
- 6LoWPAN, Zigbee®
- Modulation:
- DSSS, BPSK, O-QPSK
- Frequency:
- 769MHz ~ 935MHz
- Data Rate (Max):
- 1Mbps
- Power - Output:
- 10dBm
- Sensitivity:
- -110dBm
- Memory Size:
- 128kB Flash, 4kB EEPROM, 8kB RAM
- Serial Interfaces:
- SPI
- GPIO:
- 54
- Voltage - Supply:
- 1.8V ~ 3.6V
- Current - Receiving:
- 8.7mA ~ 9.2mA
- Current - Transmitting:
- 13mA ~ 25mA
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 64-TQFP (14x14)
ATMEGA1281R212-MU FAQ
1.How can I place an order for ATMEGA1281R212-MU through Aetrix?
Please submit a Request for Quotation (RFQ) for ATMEGA1281R212-MU 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 ATMEGA1281R212-MU reliable?
The price and inventory of ATMEGA1281R212-MU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ATMEGA1281R212-MU is usually 5 days.
3.What payment methods are accepted for ATMEGA1281R212-MU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ATMEGA1281R212-MU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ATMEGA1281R212-MU?
ATMEGA1281R212-MU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ATMEGA1281R212-MU 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 ATMEGA1281R212-MU?
For technical support, including ATMEGA1281R212-MU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ATMEGA1281R212-MU requirements.
6.How does Aetrix verify that ATMEGA1281R212-MU is sourced from the original manufacturer or authorized distributors?
All ATMEGA1281R212-MU 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 ATMEGA1281R212-MU meets industry standards.
7.What is the process for return or replacement of ATMEGA1281R212-MU?
All ATMEGA1281R212-MU units undergo pre-shipment inspection (PSI). If there is an issue with ATMEGA1281R212-MU, 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 ATMEGA1281R212-MU part is unused and in its original packaging.
Return procedure for ATMEGA1281R212-MU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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