ATMEGA2561V-8MU - 8-bit AVR MCU, 256KB Flash, 8MHz | Microchip
MPN: ATMEGA2561V-8MU ✓ Hoạt độngATMEGA2561V-8MU Tóm tắt
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, non-volatile program memory, volatile data memory, and on-chip peripherals such as timers, communication interfaces, and analog blocks. Within the embedded systems taxonomy, the ATmega2561 sits inside Microchip's high-density 8-bit AVR ATmega family: 8-bit MCU -> AVR RISC microcontroller -> embedded controller -> semiconductor IC. These devices typically act as the main control element in industrial controllers, sensor hubs, and communication nodes where deterministic real-time response is required.
Key features of the ATMEGA2561V-8MU include the AVR enhanced RISC architecture with 131 powerful instructions (most executed in a single clock cycle), 32 general-purpose working registers, fully static operation, 86 general-purpose I/O lines, four programmable serial USARTs, a master/slave SPI interface, a byte-oriented 2-wire (I2C-compatible) interface, six flexible timer/counters with compare and PWM modes, an 8-channel 10-bit ADC, an on-chip analog comparator, a programmable watchdog timer with separate on-chip oscillator, and pin-change interrupt/wake-up support. The 'V' suffix designates the 1.8V to 5.5V operating voltage range, enabling battery-powered designs and energy-harvesting nodes.
Technical depth: the AVR core is a fully static Harvard architecture with on-chip 2-cycle hardware multiplier, JTAG/OCD debugWIRE interfaces for in-circuit debugging, and a boot-loader section that supports self-programming via the on-chip boot code, enabling field firmware updates without an external programmer. The device integrates rich peripherals (USART x4, TWI, SPI, ADC, timers x6) without external glue logic, reducing BOM cost and PCB area in connected embedded nodes.
Typical applications include industrial automation controllers requiring multiple USART links for Modbus/RS-485 segments, battery-powered data loggers that benefit from the wide 1.8V to 5.5V supply and low-power idle/power-down modes, building-automation and HVAC nodes using the six timer/counters and PWM outputs, and USB-to-UART bridges or human-machine interfaces.
Design consideration: the 64-QFN (MU) land pattern differs from the TQFP-64 (AU) footprint of ATmega2560/1280 siblings, so package choice must be locked early; the exposed thermal pad must be soldered to a grounded copper pour for thermal and electrical performance.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Bộ thay thế dễ dàng lắp đặt cho ATMEGA2561V-8MU — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với ATMEGA2561V-8MU (cùng hình factor và footprint) — khác nhau ở Package, SPI, Timers/Counters, USART, ADC.
ATMEGA2561V-8MUR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ATMEGA2561-16MU
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ATMEGA2561-16MUR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ATMEGA1281V-8MU
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ATMEGA1281-16MUR
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ATMEGA2561V-8MU Tỷ lệ tối đa & tính chất điện
| Core Architecture | 8-bit AVR RISC |
| Tần số xung maksimum | 8 MHz |
| Throughput | Up to 16 MIPS at 16 MHz (8 MHz grade for V variant) |
| Program Memory (Flash) | 256 KB (128K x 16) |
| SRAM | 8 KB |
| EEPROM | 4 KB |
| Operating Voltage Range (V variant) | 1.8 V to 5.5 V |
| General-Purpose I/O Lines | 86 |
| General-Purpose Working Registers | 32 x 8 |
| USART | 4 programmable serial USARTs |
| SPI | Master/Slave SPI serial interface |
| TWI (I2C-compatible) | Byte-oriented 2-wire serial interface |
| Timers/Counters | 6 flexible timer/counters with compare and PWM modes |
| ADC | 8-channel, 10-bit ADC |
| Analog Comparator | On-chip |
| Watchdog Timer | Programmable, with separate on-chip oscillator |
| Hộp | 64-QFN (MU), 9 x 9 mm with exposed pad |
| Kiểu lắp đặt | Surface Mount |
| Nhiệt độ hoạt động | -40 C to +85 C (industrial) |
| Trạng thái RoHS | Compliant |
Cấu hình chân ATMEGA2561V-8MU
| Chân 1 | VCC — Digital supply voltage |
| Chân 2 | GND — Ground |
| Chân 3 | Port A (PA0) — GPIO / AD0 |
| Chân 4 | Port A (PA1) — GPIO / AD1 |
| Chân 5 | Port A (PA2) — GPIO / AD2 |
| Chân 6 | Port A (PA3) — GPIO / AD3 |
| Chân 7 | Port A (PA4) — GPIO / AD4 |
| Chân 8 | Port A (PA5) — GPIO / AD5 |
| Chân 9 | Port A (PA6) — GPIO / AD6 |
| Chân 10 | Port A (PA7) — GPIO / AD7 |
| Chân 11 | Port B (PB0) — GPIO / OC0 / !SS |
| Chân 12 | Port B (PB1) — GPIO / OC2B / T0 |
| Chân 13 | Port B (PB2) — GPIO / OC2A / T1 |
| Chân 14 | Port B (PB3) — GPIO / OC3A / !SS |
| Chân 15 | Port B (PB4) — GPIO / OC3B / ICP0 |
| Chân 16 | Port B (PB5) — GPIO / OC3C / ICP3 |
| Chân 17 | Port B (PB6) — GPIO / OC4A / ICP4 |
| Chân 18 | Port B (PB7) — GPIO / OC4B / ICP5 |
| Chân 19 | Port C (PC0) — GPIO / A8 |
| Chân 20 | Port C (PC1) — GPIO / A9 |
| Chân 21 | Port C (PC2) — GPIO / A10 |
| Chân 22 | Port C (PC3) — GPIO / A11 |
| Chân 23 | Port C (PC4) — GPIO / A12 |
| Chân 24 | Port C (PC5) — GPIO / A13 |
| Chân 25 | Port C (PC6) — GPIO / A14 |
| Chân 26 | Port C (PC7) — GPIO / A15 |
| Chân 27 | Port D (PD0) — GPIO / RXD1 / INT0 |
| Chân 28 | Port D (PD1) — GPIO / TXD1 / INT1 |
| Chân 29 | Port D (PD2) — GPIO / RXD2 / INT2 |
| Chân 30 | Port D (PD3) — GPIO / TXD2 / INT3 |
| Chân 31 | Port D (PD4) — GPIO / ICP1 |
| Chân 32 | Port D (PD5) — GPIO / XCK1 |
| Chân 33 | Port D (PD6) — GPIO / T1 |
| Chân 34 | Port D (PD7) — GPIO / T0 |
| Chân 35 | Port E (PE0) — GPIO / RXD0 / PDI |
| Chân 36 | Port E (PE1) — GPIO / TXD0 / PDO |
| Chân 37 | Port E (PE2) — GPIO / XCK0 / AIN0 |
| Chân 38 | Port E (PE3) — GPIO / OC3A / AIN1 |
| Chân 39 | Port E (PE4) — GPIO / OC3B / INT4 |
| Chân 40 | Port E (PE5) — GPIO / OC3C / INT5 |
| Chân 41 | Port E (PE6) — GPIO / T3 / INT6 |
| Chân 42 | Port E (PE7) — GPIO / CLKO / INT7 |
| Chân 43 | Port F (PF0) — GPIO / ADC0 |
| Chân 44 | Port F (PF1) — GPIO / ADC1 |
| Chân 45 | Port F (PF2) — GPIO / ADC2 |
| Chân 46 | Port F (PF3) — GPIO / ADC3 |
| Chân 47 | Port F (PF4) — GPIO / ADC4 / TCK |
| Chân 48 | Port F (PF5) — GPIO / ADC5 / TMS |
| Chân 49 | Port F (PF6) — GPIO / ADC6 / TDO |
| Chân 50 | Port F (PF7) — GPIO / ADC7 / TDI |
| Chân 51 | AREF — ADC reference voltage |
| Chân 52 | GND — Ground |
| Chân 53 | AVCC — Analog supply voltage for ADC |
| Chân 54 | Port G (PG0) — GPIO |
| Chân 55 | Port G (PG1) — GPIO |
| Chân 56 | Port G (PG2) — GPIO |
| Chân 57 | Port G (PG3) — GPIO |
| Chân 58 | Port G (PG4) — GPIO / TOSC1 |
| Chân 59 | Port G (PG5) — GPIO / TOSC2 |
| Chân 60 | RESET — Reset input, active low |
| Chân 61 | VCC — Digital supply voltage |
| Chân 62 | XTAL2 — Crystal oscillator output |
| Chân 63 | XTAL1 — Crystal oscillator input |
| Chân 64 | GND — Ground |
| Chân 65 | EP — Exposed thermal pad (must be soldered to grounded copper pour) |
Ứng dụng tiêu biểu
ATMEGA2561V-8MU phù hợp cho 6 Áp dụngs: Industrial Automation Controller, Battery-Powered Data Logger, Building Automation / HVAC Node, USB-to-UART Bridge / HMI Controller, Motor Control / Fan Controller, Sensor Hub / IoT Edge Node.
Industrial Automation Controller
The ATMEGA2561V-8MU fits industrial automation controllers thanks to its four programmable USARTs that map cleanly to RS-232, RS-485, and Modbus segments in a single chip, eliminating an external transceiver-multiplexer IC. Its 86 GPIO lines drive relays, opto-isolators, and 24V sensor inputs via level shifters, while the six 16-bit timer/counters generate the PWM channels needed for motor speed and valve control. The 1.8V to 5.5V V variant allows the controller to ride out brown-outs on long sensor cables without latch-up, and the 256KB Flash holds a full Modbus master stack plus application firmware with headroom for field upgrades via the on-chip boot loader.
Được đề xuất
Battery-Powered Data Logger
The ATMEGA2561V-8MU is well suited to battery-powered data loggers because its V variant operates down to 1.8V from a single lithium thionyl-chloride cell or two AA batteries, maximizing runtime. The AVR core's idle and power-down modes combined with pin-change wake-up let the MCU sleep in the microamp range between ADC samples, while the 8-channel 10-bit ADC captures sensor readings with sufficient resolution for environmental monitoring. The 8KB SRAM buffers measurement bursts before writing to the 4KB EEPROM or compressing to Flash, and the four USARTs handle periodic wireless-module or wired download links.
Được đề xuất
Building Automation / HVAC Node
The ATMEGA2561V-8MU fits building-automation and HVAC nodes where multiple PWM outputs are needed for damper and fan control, and where the device must communicate over RS-485 Modbus and I2C sensor buses simultaneously. Six 16-bit timer/counters deliver the PWM channels for variable-speed fans and proportional valves, while the four USARTs handle a Modbus master port, a BACnet MS-TP segment, and two diagnostic debug links. The 256KB Flash stores the BACnet/Modbus stack plus scheduler rules, and the 1.8V to 5.5V V variant allows operation from 3.3V backplanes common in commercial HVAC controllers.
Được đề xuất
USB-to-UART Bridge / HMI Controller
The ATMEGA2561V-8MU acts as the host MCU in USB-to-UART bridges or human-machine-interface controllers where a 9x9 mm QFN footprint and four USARTs simplify multi-port designs. The four USARTs can serve a USB CDC-ACM bridge, a debug console, an external radio module, and an isolated RS-485 link without external UART expanders. The 256KB Flash holds the USB stack and HID/keypad or display drivers, while the 86 GPIO lines multiplex keypads, character LCDs, or small TFT panels. The 1.8V to 5.5V range allows the bridge to be powered from the USB VBUS through a low-drop regulator.
Được đề xuất
Motor Control / Fan Controller
The ATMEGA2561V-8MU drives small BLDC or brushed-DC motor controllers thanks to its six 16-bit timer/counters, which provide the complementary PWM pairs and input-capture channels needed for back-EMF sensing and current feedback loops. The 8-channel 10-bit ADC samples motor current and bus voltage simultaneously, while the four USARTs link to a higher-level controller or configuration tool. The V variant's 1.8V to 5.5V range lets the controller accept 3.3V or 5V backplanes, and the 256KB Flash holds the speed-control state machine and fault-handling routines.
Được đề xuất
Sensor Hub / IoT Edge Node
The ATMEGA2561V-8MU serves as an IoT sensor-hub MCU aggregating I2C and SPI sensors and forwarding data over a wireless module on one of its four USARTs. Its TWI (I2C) and SPI peripherals handle multiple environmental sensors in parallel, while the 86 GPIO lines manage chip-selects, interrupts, and indicator LEDs. The 256KB Flash stores TLS-lite or MQTT-SN client code along with sensor-driver libraries, and the 1.8V to 5.5V V variant lets the node run from energy-harvesting supplies or 3.6V lithium cells without additional regulators.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho ATMEGA2561V-8MU — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | ATMEGA2561V-8MUR | ATMEGA2561-16MU | ATMEGA2561-16MUR | ATMEGA1281V-8MU | ATMEGA1281-16MU |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 64-QFN (MU), 9x9 mm | 64-QFN (MU), 9x9 mm - same | 64-QFN (MU), 9x9 mm - same | 64-QFN (MU), 9x9 mm - same | 64-QFN (MU), 9x9 mm - same | 64-QFN (MU), 9x9 mm - same |
| Maximum Clock Frequency | 8 MHz (V variant) | 8 MHz (V variant) | 16 MHz | 16 MHz | 8 MHz (V variant) | 16 MHz |
| Minimum Operating Voltage | 1.8 V | 1.8 V | 2.7 V | 2.7 V | 1.8 V | 2.7 V |
| Flash Memory | 256 KB | 256 KB | 256 KB | 256 KB | 128 KB | 128 KB |
| SRAM | 8 KB | 8 KB | 8 KB | 8 KB | 8 KB | 8 KB |
| EEPROM | 4 KB | 4 KB | 4 KB | 4 KB | 4 KB | 4 KB |
| USARTs | 4 | 4 | 4 | 4 | 4 | 4 |
| GPIO Lines | 86 | 86 | 86 | 86 | 86 | 86 |
| ADC Channels x Resolution | 8 x 10-bit | 8 x 10-bit | 8 x 10-bit | 8 x 10-bit | 8 x 10-bit | 8 x 10-bit |
Bảo phân biệt quan trọng
- Low-voltage 1.8V to 5.5V operation across the entire family (vsATMEGA2561-16MU)
- Industry-leading 256 KB Flash for an 8-bit AVR in a 9x9 mm QFN (vsATMEGA1281V-8MU)
- Four programmable USARTs in a single QFN package (vsATMEGA2560-16AU (TQFP-64))
- On-chip boot-loader section for field firmware updates (vsATMEGA1281-16MU)
Ghi chú thiết kế
The ATMEGA2561V-8MU requires multiple VCC pins (1, 8, 23, 38, 52 by convention for the 64-QFN layout) and an AVCC pin for the ADC that must be filtered through an LC or ferrite-bead network. Decouple each VCC pin with a 100 nF X7R ceramic placed within 3 mm of the pad, plus a bulk 4.7 uF to 10 uF tantalum or ceramic close to the package. AVCC must be tied to VCC through a ferrite bead and decoupled with 100 nF + 10 uF; AREF should have a 100 nF bypass cap when the ADC is used. Estimated: at 8 MHz active and 3.3V, core current is around 8-10 mA, but peak surges during Flash programming can reach 25 mA - budget decoupling accordingly.
Although the ATMEGA2561V-8MU dissipates only hundreds of milliwatts, the 64-QFN (MU) package relies on the exposed thermal pad (EP) for the primary heat path. Solder the EP directly to a grounded copper pour that is at least 1 square inch (645 mm^2) on the top or inner layer. Estimated: with the EP properly soldered, theta_JA drops to roughly 25 C/W versus 40+ C/W without it. For continuous ADC sampling or sustained SPI throughput at 5V, an undersized EP can cause a 5-10 C temperature rise that pushes junction temperature toward the 85 C industrial limit.
Route the four USART signals in impedance-controlled differential pairs (RS-485) or with ground-guard traces (RS-232) to minimize cross-talk with adjacent GPIO traces. Keep the XTAL1/XTAL2 traces short (under 5 mm) and surrounded by a ground ring; place load capacitors within 3 mm of the crystal pins. For JTAG/debugWIRE, bring out the !RESET, TDI, TDO, TMS, TCK, and GND pins to a 2x5 0.05 inch header on the board edge to allow in-circuit programming. The 64-QFN (9x9 mm) has 0.5 mm pitch pads requiring precise solder-paste stencil apertures (typically 0.25 mm with 0.1 mm thickness).
Do not confuse the ATMEGA2561-16MU footprint with the ATMEGA2560-16AU footprint: the 2561 family uses 64-QFN (MU) while the 2560 family uses TQFP-64 (AU) - they are NOT drop-in compatible despite the same family name. For designs that must run below 2.7V (single-cell Li-ion, 2x AA, energy harvesting), the 16 MHz part will NOT operate reliably; only the V variant (1.8V to 5.5V) supports those rails. The fuse settings for clock source and brown-out must be set before production - leaving default fuses can cause the bootloader to fail on a slow crystal.
Thông tin tuân thủ
RoHS and REACH compliance per Microchip product page. Not AEC-Q100 qualified; for automotive applications use ATMEGA2561V-8AU or ATMEGA2561-16AU automotive-qualified siblings. Halogen-free status not explicitly stated in the verified data.
