ATmega1281 - Microcontroller Microchip - Free user manual and instructions
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| Product Type | 8-bit AVR Microcontroller |
| Brand | Microchip |
| Model | ATmega1281 |
| Core | AVR |
| Flash Memory | 128 KB |
| SRAM | 8 KB |
| EEPROM | 4 KB |
| Max Clock Speed | 16 MHz |
| I/O Pins | 54 |
| Operating Voltage | 2.7V - 5.5V |
| Power Consumption (Active) | ~10 mA at 5V, 16 MHz |
| Temperature Range | -40°C to +85°C |
| Package Type | TQFP-64 |
| Dimensions (approx.) | 14 mm x 14 mm (TQFP) |
| Weight (approx.) | 0.2 g |
| Key Peripherals | SPI, I2C, USART, ADC (10-bit), PWM, Timers, Watchdog |
| Security Features | Lock bits for Flash and EEPROM |
| Maintenance | None required; avoid static discharge |
| Repairability | Professional soldering required for replacement |
| Spare Parts Availability | Readily available from distributors |
Frequently Asked Questions - ATmega1281 Microchip
How to program the ATmega1281?
Use an ISP programmer (e.g., AVRISP mkII) with Microchip Studio or AVRdude. Connect MOSI, MISO, SCK, RESET, VCC, and GND.
What is the maximum clock speed?
The maximum clock speed is 16 MHz at 5V, but it can be reduced to save power.
Does it have an internal oscillator?
Yes, it has an internal 8 MHz RC oscillator, but external crystal can be used for higher accuracy.
What is the operating voltage range?
It operates from 2.7V to 5.5V. For lower voltages, check the datasheet for frequency limits.
How many PWM channels are available?
It has multiple timers providing up to 6 PWM channels (depending on configuration).
Can I use Arduino libraries?
Yes, you can use the Arduino core for ATmega1281 by selecting the appropriate board (e.g., Sanguino) in Arduino IDE.
What is the difference between ATmega1281 and ATmega2561?
ATmega2561 has 256 KB Flash compared to 128 KB, otherwise similar peripherals.
How to reduce power consumption?
Use sleep modes (Idle, Power-down, Power-save), disable unused modules, and reduce clock speed.
What are the available communication interfaces?
It has 2 USARTs, 1 SPI, 1 TWI (I2C), and 1 CAN controller on some variants? Actually, ATmega1281 does not have CAN; it has USART, SPI, TWI.
Is it compatible with ATmega1280?
It is not directly pin-compatible; ATmega1281 is a 64-pin package while ATmega1280 is 100-pin. Check datasheet for differences.
User questions about ATmega1281 Microchip
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USER MANUAL ATmega1281 Microchip
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Product information
Brand : Microchip
Model : ATmega1281
Category : Microcontroller