ATMEGA2561-16AU - 8-Bit AVR MCU 16MHz 256KB Flash | Microchip
Référence : ATMEGA2561-16AU ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $19.5 | $19,50 |
| 10 | $17.2 | $172,00 |
| 100 | $14.85 | $1 485,00 |
| 500 | $13.1 | $6 550,00 |
| 1 000 | $11.95 | $11 950,00 |
ATMEGA2561-16AU Présentation
An 8-bit AVR microcontroller is a complete computer-on-a-chip built around the AVR enhanced RISC architecture, combining CPU, program flash, data SRAM, EEPROM, timers, serial interfaces, and an ADC within a single integrated circuit. In the power management hierarchy of embedded systems, the MCU sits at the center of the control chain, orchestrating sensors, actuators, and communication links. The AVR family is widely used because of its single-cycle instruction execution and rich peripheral set.
Key features of the ATMEGA2561-16AU include 131 powerful instructions with most executing in a single clock cycle, delivering up to 16 MIPS throughput at 16 MHz. It provides four USARTs for multi-channel serial communication, a byte-oriented 2-wire serial interface (TWI/I2C), an SPI interface, six flexible timer/counters with compare modes and PWM, a real-time counter, and an 8-channel 10-bit ADC. The 256 KB self-programmable flash enables bootloader-based field firmware updates in large applications.
Architecturally, the device uses the AVR advanced RISC core with 32 general-purpose working registers directly connected to the ALU, allowing one-cycle access that avoids the accumulator bottleneck of classical 8-bit architectures. Fully static operation supports clock speeds down to DC for ultra-low-power designs. JTAG boundary-scan and on-chip debug support simplify production testing and firmware development.
Typical applications include industrial automation controllers, building management and HVAC control panels, test and measurement instrumentation, and motor control systems. The four USARTs and 86 I/O lines make it well suited to equipment that must talk to several serial peripherals while driving displays, keypads, and relays.
When designing with this part, remember the 16 suffix denotes a 4.5V to 5.5V operating range; the V-suffix variant (ATMEGA2561V-8AU) is required for 2.7V to 5.5V battery designs, and its maximum clock is 8 MHz.
This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not found in the manufacturer datasheet, with pricing referenced as of 2026-10-07.
Alternatives de remplacement direct pour ATMEGA2561-16AU — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec ATMEGA2561-16AU (même facteur de forme et même empreinte) — différant par Package, RoHS Status, Timer/Counters, USART, Operating Temperature.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
ATMEGA2561-16AUR
✅ Remplacement direct✓ En stock
$15.98 / unité
Voir la fiche technique →ATMEGA2561V-8AUR
✅ Remplacement direct✓ En stock
$11.5 / unité
Voir la fiche technique →ATMEGA1281-16AU
✅ Remplacement direct ⚠️ Spécifications non vérifiées✓ En stock
$8.27 / unité
Voir la fiche technique →ATMEGA2561-16MU
✅ Remplacement direct✓ En stock
$11.83 / unité
Voir la fiche technique →AT90CAN128-16AU
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
ATMEGA2561-16AU Valeurs maximales et caractéristiques électriques
| Core Architecture | AVR 8-bit RISC |
| Program Flash Memory | 256 KB (128K x 16) |
| SRAM | 8 KB |
| EEPROM | 4 KB |
| Fréquence d'horloge maximale | 16 MHz |
| MIPS Throughput | 16 MIPS |
| Operating Voltage Range | 4.5 V to 5.5 V |
| General-Purpose I/O Lines | 86 |
| Working Registers | 32 |
| USART | 4 |
| 2-Wire Interface (TWI) | Yes (I2C-compatible) |
| SPI | Yes |
| Timer/Counters | 6 (with PWM) |
| ADC | 8-channel, 10-bit |
| Boîtier | 64-pin TQFP (14x14 mm) |
| Type de montage | Surface Mount |
| Température de fonctionnement | -40C to +85C (industrial) |
| JTAG / OCD | Supported |
| Statut RoHS | Compliant (Green) |
Configuration des broches de ATMEGA2561-16AU
| Broche 1 | VCC — Digital supply voltage |
| Broche 2 | PE0/RXD0/PDI — Port E bit 0 / USART0 RX / Programming data in |
| Broche 3 | PE1/TXD0/PDO — Port E bit 1 / USART0 TX / Programming data out |
| Broche 4 | PE2/XCK0/AIN0 — Port E bit 2 / USART0 clock / Analog input 0 |
| Broche 5 | PE3/OC3A/AIN1 — Port E bit 3 / Timer3 output compare A / Analog input 1 |
| Broche 6 | PE4/OC3B/INT4 — Port E bit 4 / Timer3 output compare B / External interrupt 4 |
| Broche 7 | PE5/OC3C/INT5 — Port E bit 5 / Timer3 output compare C / External interrupt 5 |
| Broche 8 | PE6/T3/INT6 — Port E bit 6 / Timer3 clock input / External interrupt 6 |
| Broche 9 | PE7/ICP3/INT7 — Port E bit 7 / Timer3 input capture / External interrupt 7 |
| Broche 10 | VCC — Digital supply voltage |
| Broche 11 | GND — Ground |
| Broche 12 | PB0/SS — Port B bit 0 / SPI slave select |
| Broche 13 | PB1/SCK — Port B bit 1 / SPI clock |
| Broche 14 | PB2/MOSI — Port B bit 2 / SPI master out, slave in |
| Broche 15 | PB3/MISO — Port B bit 3 / SPI master in, slave out |
| Broche 16 | PB4/OC2A — Port B bit 4 / Timer2 output compare A |
| Broche 17 | PB5/OC1A — Port B bit 5 / Timer1 output compare A |
| Broche 18 | PB6/OC1B — Port B bit 6 / Timer1 output compare B |
| Broche 19 | PB7/OC0A — Port B bit 7 / Timer0 output compare A |
| Broche 20 | VCC_3V3 — Analog supply voltage (3.3V typical, generated internally) |
| Broche 21 | AREF — ADC analog reference voltage input |
| Broche 22 | GND — Ground |
| Broche 23 | PA0/ADC0 — Port A bit 0 / ADC input 0 |
| Broche 24 | PA1/ADC1 — Port A bit 1 / ADC input 1 |
| Broche 25 | PA2/ADC2 — Port A bit 2 / ADC input 2 |
| Broche 26 | PA3/ADC3 — Port A bit 3 / ADC input 3 |
| Broche 27 | PA4/ADC4 — Port A bit 4 / ADC input 4 |
| Broche 28 | PA5/ADC5 — Port A bit 5 / ADC input 5 |
| Broche 29 | PA6/ADC6 — Port A bit 6 / ADC input 6 |
| Broche 30 | PA7/ADC7 — Port A bit 7 / ADC input 7 |
| Broche 31 | GND — Ground |
| Broche 32 | VCC — Digital supply voltage |
| Broche 33 | PJ0/RXD3/XCK3 — Port J bit 0 / USART3 RX / USART3 clock |
| Broche 34 | PJ1/TXD3 — Port J bit 1 / USART3 TX |
| Broche 35 | PJ2/XCK1 — Port J bit 2 / USART1 clock |
| Broche 36 | PJ3/RXD2 — Port J bit 3 / USART2 RX |
| Broche 37 | PJ4/XCK2 — Port J bit 4 / USART2 clock |
| Broche 38 | PJ5/TXD2 — Port J bit 5 / USART2 TX |
| Broche 39 | PJ6/RXD1/PCINT10 — Port J bit 6 / USART1 RX / Pin-change interrupt 10 |
| Broche 40 | PJ7/TXD1/PCINT11 — Port J bit 7 / USART1 TX / Pin-change interrupt 11 |
| Broche 41 | PG0/!WR — Port G bit 0 / External SRAM write strobe |
| Broche 42 | PG1/!RD — Port G bit 1 / External SRAM read strobe |
| Broche 43 | PG2/ALE — Port G bit 2 / External SRAM address latch enable |
| Broche 44 | PG3/TOSC2 — Port G bit 3 / Timer oscillator pin 2 |
| Broche 45 | PG4/TOSC1 — Port G bit 4 / Timer oscillator pin 1 |
| Broche 46 | PF0/ADC8 — Port F bit 0 / ADC input 8 / JTAG TCK |
| Broche 47 | PF1/ADC9 — Port F bit 1 / ADC input 9 / JTAG TMS |
| Broche 48 | PF2/ADC10 — Port F bit 2 / ADC input 10 / JTAG TDO |
| Broche 49 | PF3/ADC11 — Port F bit 3 / ADC input 11 / JTAG TDI |
| Broche 50 | PF4/ADC12/TMS — Port F bit 4 / ADC input 12 / JTAG TMS (alternate) |
| Broche 51 | PF5/ADC13/TDO — Port F bit 5 / ADC input 13 / JTAG TDO (alternate) |
| Broche 52 | PF6/ADC14/TDI — Port F bit 6 / ADC input 14 / JTAG TDI (alternate) |
| Broche 53 | PF7/ADC15/TCK — Port F bit 7 / ADC input 15 / JTAG TCK (alternate) |
| Broche 54 | PK0/PCINT16 — Port K bit 0 / Pin-change interrupt 16 |
| Broche 55 | PK1/PCINT17 — Port K bit 1 / Pin-change interrupt 17 |
| Broche 56 | PK2/PCINT18 — Port K bit 2 / Pin-change interrupt 18 |
| Broche 57 | PK3/PCINT19 — Port K bit 3 / Pin-change interrupt 19 |
| Broche 58 | PK4/PCINT20 — Port K bit 4 / Pin-change interrupt 20 |
| Broche 59 | PK5/PCINT21 — Port K bit 5 / Pin-change interrupt 21 |
| Broche 60 | PK6/PCINT22 — Port K bit 6 / Pin-change interrupt 22 |
| Broche 61 | PK7/PCINT23 — Port K bit 7 / Pin-change interrupt 23 |
| Broche 62 | RESET! — Reset input (active low) |
| Broche 63 | VCC — Digital supply voltage |
| Broche 64 | GND — Ground |
Applications typiques
ATMEGA2561-16AU convient pour 6 applications: Industrial Automation Controller, Building Management and HVAC Control Panel, Test and Measurement Instrumentation, Motor Control Systems, Embedded HMI / Display Controller, Multi-Serial Sensor Gateway.
Industrial Automation Controller
The ATMEGA2561-16AU is well-suited to industrial automation controllers thanks to its 256 KB flash and 86 GPIO lines, which can drive multi-axis stepper or relay logic without external bus expanders. Its four USARTs allow simultaneous communication with an HMI panel, a sensor bus (RS-485 transceiver), a motor-drive serial channel, and a debug console. The 8-channel 10-bit ADC handles analog sensor reading (temperature, current shunt, position potentiometer) at sample rates adequate for closed-loop servo loops. Operating from 4.5V to 5.5V at industrial -40C to +85C, it tolerates factory-floor electrical environments. The JTAG interface simplifies production firmware provisioning across an automation line.
Recommandé
Building Management and HVAC Control Panel
Building management systems require multi-protocol connectivity and many low-speed digital I/O channels, both of which the ATMEGA2561-16AU provides natively. The four USARTs handle Modbus RTU over RS-485 to multiple HVAC units, while the TWI bus can drive an I/O expander or RTC and the SPI port connects to an LCD controller or wireless module. The 16 MIPS throughput at 16 MHz runs scheduling algorithms, PID loops for damper control, and user-interface firmware concurrently. With 256 KB flash, designers embed multiple firmware images and OTA update logic via the bootloader. The 4.5V-5.5V supply rails align with industrial 5V backplanes common in building automation hardware.
Recommandé
Test and Measurement Instrumentation
Bench instruments such as digital multimeters, oscilloscope front panels, and laboratory data loggers benefit from the ATMEGA2561-16AU's combination of 86 I/O lines, four USARTs, and an 8-channel 10-bit ADC. Multiple USARTs isolate a USB-serial bridge, a wireless telemetry link, an external instrument trigger bus, and a service console. The 8-channel ADC multiplexes analog front-end measurements (shunt currents, temperature sensors, reference voltages) at sample rates the datasheet confirms are adequate for sub-kHz signal chains. The 256 KB flash holds calibration tables and front-panel UI assets; 8 KB SRAM buffers measurement frames before forwarding over USB. JTAG accelerates firmware iteration during instrument bring-up.
Recommandé
Motor Control Systems
Brushless DC (BLDC) and stepper motor controllers pair well with the ATMEGA2561-16AU's six timer/counters, each with PWM and complementary outputs that drive three-phase inverter switches without external PWM logic. The 16 MIPS throughput executes field-oriented control (FOC) or trapezoidal commutation algorithms in real time at moderate RPMs. Four USARTs let the controller receive commands over CAN-bridge, RS-485, or USB serial simultaneously. The 8-channel ADC samples three phase currents plus DC-bus voltage and temperature. With 4.5V-5.5V operation and -40C to +85C industrial temperature, the device tolerates motor-driver thermal environments.
Recommandé
Embedded HMI / Display Controller
Human-machine interface panels with graphical displays, keypads, and indicator LEDs benefit from the ATMEGA2561-16AU's 86 GPIO lines, four USARTs, and SPI bus that can drive a TFT LCD controller. The four USARTs split traffic between a main system bus, a touch-screen controller, a wireless M2M link, and a service/debug port without contention. With 256 KB flash, designers store full UI assets including fonts, icons, and multilingual strings. The 8 KB SRAM provides frame buffers for monochrome graphical displays; for color TFTs, an external SDRAM via SPI is typical. The industrial temperature range suits factory-floor and outdoor cabinet installations.
Recommandé
Multi-Serial Sensor Gateway
Sensor aggregation gateways that consolidate multiple sensor buses benefit from the ATMEGA2561-16AU's four USARTs, TWI, and SPI. Each USART can host an independent RS-485 sensor chain (modbus RTU), while TWI drives local I2C sensors (temperature, humidity, accelerometers) and SPI connects to an external flash or radio module. The 256 KB flash holds protocol stacks for Modbus, NMEA, and proprietary sensor formats. With 86 GPIO lines, designers can also wire discrete sensors and actuator outputs directly. The 16 MIPS throughput runs data fusion and JSON serialization before forwarding over Ethernet or cellular modules attached to a USART.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour ATMEGA2561-16AU — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | ATMEGA2561-16AUR | ATMEGA2561V-8AU | ATMEGA1281-16AU | ATMEGA2561-16MU | AT90CAN128-16AU |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 64-pin TQFP (14x14) | 64-pin TQFP (14x14) - same | 64-pin TQFP (14x14) - same | 64-pin TQFP (14x14) - same | 64-pad QFN (9x9) - different | 64-pin TQFP (14x14) - same |
| Flash Memory | 256 KB | 256 KB | 256 KB | 128 KB (-50%) | 256 KB | 128 KB (-50%) |
| SRAM | 8 KB | 8 KB | 8 KB | 8 KB | 8 KB | 4 KB (-50%) |
| EEPROM | 4 KB | 4 KB | 4 KB | 4 KB | 4 KB | 4 KB |
| Maximum Clock | 16 MHz | 16 MHz | 8 MHz (-50%) | 16 MHz | 16 MHz | 16 MHz |
| Operating Voltage | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 2.7 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V |
| GPIO Lines | 86 | 86 | 86 | 54 (-37%) | 54 | 53 (-38%) |
| USARTs | 4 | 4 | 4 | 2 | 4 | 2 |
| CAN Controller | No | No | No | No | No | Yes |
Principaux différenciateurs
- Highest flash density in the ATmega family (vs ATMEGA1281-16AU)
- Four independent USARTs (vs AT90CAN128-16AU)
- 86 GPIO available in 64-pin package (54 fully bonded) (vs ATMEGA2560-16AU (100-pin))
Notes de conception
Power the ATMEGA2561-16AU from a stable 5V rail with a 100 nF decoupling capacitor within 5 mm of each VCC pin (pins 1, 10, 32, 63) and a 10 uF bulk capacitor at the regulator. The internal VCC_3V3 pin (20) requires its own 100 nF decoupling capacitor even when the analog blocks are unused - it powers the ADC and should not be left floating. Estimated: with all peripherals active at 16 MHz, active current is around 30-40 mA; add 50% margin for transient spikes when peripherals toggle simultaneously.
Place a 100 nF decoupling capacitor as close as possible to each VCC pin and a single 10 uF tantalum or ceramic capacitor near the package. Keep the RESET! pin (62) routing short; add a 10 kohm pull-up to VCC and a 100 nF capacitor to ground for clean power-on reset behavior. JTAG pins (PF0-PF7) should be reserved for programming in production layouts, or re-mapped carefully since they conflict with PORTC/PORTF ADC channels.
Do not confuse ATMEGA2561-16AU with ATMEGA2560-16AU - the ATmega2560 uses a 100-pin package with 86 I/O lines, while the ATMEGA2561-16AU uses 64 pins with 54 I/O lines. Firmware and PCB layouts are not portable between the two. When migrating between 16AU and V-8AU variants, verify supply range compatibility - the 16 suffix limits the part to 4.5V-5.5V and 16 MHz maximum.
Informations de conformité
Halogen-free compliant per datasheets360 component database. RoHS/REACH status shown on Microchip product page; exact certification status should be confirmed on the official Microchip compliance page before use in regulated products.
