# ATMEGA1284P-AU

**Microchip Tech** · Microcontrollers (MCU/MPU/SOC) · TQFP-44(10x10)

ATMEGA1284P-AU from Microchip Tech, in a TQFP-44(10x10). Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | PB5 | bidirectional | Port B bit 5 is a bidirectional I/O with internal pull-up, also serving PCINT13 and SPI MOSI. |
| 2 | PB6 | bidirectional | Port B bit 6 is a bidirectional I/O with internal pull-up, also serving PCINT14 and SPI MISO. |
| 3 | PB7 | bidirectional | Port B bit 7 is a bidirectional I/O with internal pull-up, also serving PCINT15 and SPI SCK. |
| 4 | RESET | input | A low level on this pin for longer than the minimum pulse length generates a reset, even if the clock is not running; shorter pulses are not guaranteed to reset the device. |
| 5 | VCC | power_in | Digital supply voltage. |
| 6 | GND | power_in | Ground. |
| 7 | XTAL2 | output | Output from the inverting oscillator amplifier. |
| 8 | XTAL1 | input | Input to the inverting oscillator amplifier and to the internal clock operating circuit. |
| 9 | PD0 | bidirectional | Port D bit 0 is a bidirectional I/O with internal pull-up, also serving PCINT24 and USART0 RxD0. |
| 10 | PD1 | bidirectional | Port D bit 1 is a bidirectional I/O with internal pull-up, also serving PCINT25 and USART0 TxD0. |
| 11 | PD2 | bidirectional | Port D bit 2 is a bidirectional I/O with internal pull-up, also serving external interrupt INT0, PCINT26 and USART1 RxD1. |
| 12 | PD3 | bidirectional | Port D bit 3 is a bidirectional I/O with internal pull-up, also serving external interrupt INT1, PCINT27 and USART1 TxD1. |
| 13 | PD4 | bidirectional | Port D bit 4 is a bidirectional I/O with internal pull-up, also serving PCINT28, Timer/Counter1 OC1B and USART1 XCK1. |
| 14 | PD5 | bidirectional | Port D bit 5 is a bidirectional I/O with internal pull-up, also serving PCINT29 and Timer/Counter1 OC1A. |
| 15 | PD6 | bidirectional | Port D bit 6 is a bidirectional I/O with internal pull-up, also serving PCINT30, Timer/Counter2 OC2B and Timer/Counter1 input capture ICP1. |
| 16 | PD7 | bidirectional | Port D bit 7 is a bidirectional I/O with internal pull-up, also serving PCINT31 and Timer/Counter2 OC2A. |
| 17 | VCC | power_in | Digital supply voltage. |
| 18 | GND | power_in | Ground. |
| 19 | PC0 | bidirectional | Port C bit 0 is a bidirectional I/O with internal pull-up, also serving PCINT16 and TWI SCL. |
| 20 | PC1 | bidirectional | Port C bit 1 is a bidirectional I/O with internal pull-up, also serving PCINT17 and TWI SDA. |
| 21 | PC2 | bidirectional | Port C bit 2 is a bidirectional I/O with internal pull-up, also serving PCINT18 and JTAG TCK. |
| 22 | PC3 | bidirectional | Port C bit 3 is a bidirectional I/O with internal pull-up, also serving PCINT19 and JTAG TMS. |
| 23 | PC4 | bidirectional | Port C bit 4 is a bidirectional I/O with internal pull-up, also serving PCINT20 and JTAG TDO. |
| 24 | PC5 | bidirectional | Port C bit 5 is a bidirectional I/O with internal pull-up, also serving PCINT21 and JTAG TDI. |
| 25 | PC6 | bidirectional | Port C bit 6 is a bidirectional I/O with internal pull-up, also serving PCINT22 and the 32.768 kHz oscillator TOSC1. |
| 26 | PC7 | bidirectional | Port C bit 7 is a bidirectional I/O with internal pull-up, also serving PCINT23 and the 32.768 kHz oscillator TOSC2. |
| 27 | AVCC | power_in | Supply voltage pin for Port A and the ADC; it should be externally connected to VCC even if the ADC is not used, and through a low-pass filter if the ADC is used. |
| 28 | GND | power_in | Ground. |
| 29 | AREF | input | Analog reference pin for the Analog-to-digital Converter. |
| 30 | PA7 | bidirectional | Port A bit 7 is a bidirectional I/O with internal pull-up that also serves as ADC7 analog input and PCINT7. |
| 31 | PA6 | bidirectional | Port A bit 6 is a bidirectional I/O with internal pull-up that also serves as ADC6 analog input and PCINT6. |
| 32 | PA5 | bidirectional | Port A bit 5 is a bidirectional I/O with internal pull-up that also serves as ADC5 analog input and PCINT5. |
| 33 | PA4 | bidirectional | Port A bit 4 is a bidirectional I/O with internal pull-up that also serves as ADC4 analog input and PCINT4. |
| 34 | PA3 | bidirectional | Port A bit 3 is a bidirectional I/O with internal pull-up that also serves as ADC3 analog input and PCINT3. |
| 35 | PA2 | bidirectional | Port A bit 2 is a bidirectional I/O with internal pull-up that also serves as ADC2 analog input and PCINT2. |
| 36 | PA1 | bidirectional | Port A bit 1 is a bidirectional I/O with internal pull-up that also serves as ADC1 analog input and PCINT1. |
| 37 | PA0 | bidirectional | Port A bit 0 is a bidirectional I/O with internal pull-up that also serves as ADC0 analog input and PCINT0. |
| 38 | VCC | power_in | Digital supply voltage. |
| 39 | GND | power_in | Ground. |
| 40 | PB0 | bidirectional | Port B bit 0 is a bidirectional I/O with internal pull-up, also serving PCINT8, Timer/Counter0 T0 and USART0 XCK0. |
| 41 | PB1 | bidirectional | Port B bit 1 is a bidirectional I/O with internal pull-up, also serving PCINT9, CLKO and Timer/Counter1 T1. |
| 42 | PB2 | bidirectional | Port B bit 2 is a bidirectional I/O with internal pull-up, also serving external interrupt INT2, PCINT10 and analog comparator input AIN0. |
| 43 | PB3 | bidirectional | Port B bit 3 is a bidirectional I/O with internal pull-up, also serving PCINT11, analog comparator input AIN1 and Timer/Counter0 OC0A. |
| 44 | PB4 | bidirectional | Port B bit 4 is a bidirectional I/O with internal pull-up, also serving PCINT12, Timer/Counter0 OC0B and SPI SS. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Microchip Tech |
| Package | TQFP-44(10x10) |
| Category | Embedded Processors & Controllers |
| Pins | 44 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Operating voltage |  | 1.8 |  | 5.5 | V | Operating Voltage (features list; ordering table lists 1.8 - 5.5 V) | 2 |
| Speed grade |  | 0 |  | 4 | MHz | @ 1.8V - 5.5V | 2 |
| Speed grade |  | 0 |  | 10 | MHz | @ 2.7V - 5.5V | 2 |
| Speed grade |  | 0 |  | 20 | MHz | @ 4.5V - 5.5V | 2 |

## CAD (KiCad official)

- Symbol: `ATMEGA1284P-AU`
- Footprint: `Package_QFP:TQFP-44_10x10mm_P0.8mm`
- 3D model: TQFP-44(10x10) (KiCad packages3D, STEP)
- 3D model files: `atmega1284p-au-etched.step` / `atmega1284p-au-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `atmega1284p-au.step` / `atmega1284p-au.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [Microchip Tech datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8586175653775618048) (16 pp, sha256 `e9c076b4cf9d8569`, retrieved 2026-10-18, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/atmega1284p-au-datasheet.pdf)