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ATMEGA644-20AU
Public Made by Adomby adom
Microchip Tech Pre-ordered MCUs, TQFP-44(10x10). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownATMEGA644-20AU
Microchip Tech · Pre-ordered MCUs · TQFP-44(10x10)
ATMEGA644-20AU 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, 8-bit bi-directional I/O with selectable internal pull-up; alternate functions MOSI and PCINT13. |
| 2 | PB6 | bidirectional | Port B bit 6, bi-directional I/O with selectable internal pull-up; alternate functions MISO and PCINT14. |
| 3 | PB7 | bidirectional | Port B bit 7, bi-directional I/O with selectable internal pull-up; alternate functions SCK and PCINT15. |
| 4 | RESET | input | Reset input; a low level longer than the minimum pulse length generates a reset even if the clock is not running. |
| 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 input to the internal clock operating circuit. |
| 9 | PD0 | bidirectional | Port D bit 0, bi-directional I/O with selectable internal pull-up; alternate functions RXD0 and PCINT24. |
| 10 | PD1 | bidirectional | Port D bit 1, bi-directional I/O with selectable internal pull-up; alternate functions TXD0 and PCINT25. |
| 11 | PD2 | bidirectional | Port D bit 2, bi-directional I/O with selectable internal pull-up; alternate functions INT0 and PCINT26. |
| 12 | PD3 | bidirectional | Port D bit 3, bi-directional I/O with selectable internal pull-up; alternate functions INT1 and PCINT27. |
| 13 | PD4 | bidirectional | Port D bit 4, bi-directional I/O with selectable internal pull-up; alternate functions OC1B and PCINT28. |
| 14 | PD5 | bidirectional | Port D bit 5, bi-directional I/O with selectable internal pull-up; alternate functions OC1A and PCINT29. |
| 15 | PD6 | bidirectional | Port D bit 6, bi-directional I/O with selectable internal pull-up; alternate functions OC2B, ICP and PCINT30. |
| 16 | PD7 | bidirectional | Port D bit 7, bi-directional I/O with selectable internal pull-up; alternate functions OC2A and PCINT31. |
| 17 | VCC | power_in | Digital supply voltage. |
| 18 | GND | power_in | Ground. |
| 19 | PC0 | bidirectional | Port C bit 0, bi-directional I/O with selectable internal pull-up; alternate functions SCL and PCINT16. |
| 20 | PC1 | bidirectional | Port C bit 1, bi-directional I/O with selectable internal pull-up; alternate functions SDA and PCINT17. |
| 21 | PC2 | bidirectional | Port C bit 2, bi-directional I/O with selectable internal pull-up; JTAG TCK and PCINT18. |
| 22 | PC3 | bidirectional | Port C bit 3, bi-directional I/O with selectable internal pull-up; JTAG TMS and PCINT19. |
| 23 | PC4 | bidirectional | Port C bit 4, bi-directional I/O with selectable internal pull-up; JTAG TDO and PCINT20. |
| 24 | PC5 | bidirectional | Port C bit 5, bi-directional I/O with selectable internal pull-up; JTAG TDI and PCINT21. |
| 25 | PC6 | bidirectional | Port C bit 6, bi-directional I/O with selectable internal pull-up; alternate functions TOSC1 and PCINT22. |
| 26 | PC7 | bidirectional | Port C bit 7, bi-directional I/O with selectable internal pull-up; alternate functions TOSC2 and PCINT23. |
| 27 | AVCC | power_in | Supply voltage for the Analog-to-digital Converter; must be connected to VCC even if the ADC is not used, 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, bi-directional I/O with selectable internal pull-up and ADC7 analog input; also PCINT7. |
| 31 | PA6 | bidirectional | Port A bit 6, bi-directional I/O with selectable internal pull-up and ADC6 analog input; also PCINT6. |
| 32 | PA5 | bidirectional | Port A bit 5, bi-directional I/O with selectable internal pull-up and ADC5 analog input; also PCINT5. |
| 33 | PA4 | bidirectional | Port A bit 4, bi-directional I/O with selectable internal pull-up and ADC4 analog input; also PCINT4. |
| 34 | PA3 | bidirectional | Port A bit 3, bi-directional I/O with selectable internal pull-up and ADC3 analog input; also PCINT3. |
| 35 | PA2 | bidirectional | Port A bit 2, bi-directional I/O with selectable internal pull-up and ADC2 analog input; also PCINT2. |
| 36 | PA1 | bidirectional | Port A bit 1, bi-directional I/O with selectable internal pull-up and ADC1 analog input; also PCINT1. |
| 37 | PA0 | bidirectional | Port A bit 0, bi-directional I/O with selectable internal pull-up and ADC0 analog input; also PCINT0. |
| 38 | VCC | power_in | Digital supply voltage. |
| 39 | GND | power_in | Ground. |
| 40 | PB0 | bidirectional | Port B bit 0, bi-directional I/O with selectable internal pull-up; alternate functions XCK0, T0 and PCINT8. |
| 41 | PB1 | bidirectional | Port B bit 1, bi-directional I/O with selectable internal pull-up; alternate functions T1, CLKO and PCINT9. |
| 42 | PB2 | bidirectional | Port B bit 2, bi-directional I/O with selectable internal pull-up; alternate functions AIN0, INT2 and PCINT10. |
| 43 | PB3 | bidirectional | Port B bit 3, bi-directional I/O with selectable internal pull-up; alternate functions AIN1, OC0A and PCINT11. |
| 44 | PB4 | bidirectional | Port B bit 4, bi-directional I/O with selectable internal pull-up; alternate functions SS, OC0B and PCINT12. |
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 |
|---|---|---|---|---|---|---|---|
| Operational temperature range (Industrial) | -40 | 85 | °C | Industrial operational range | 15 | ||
| Power supply voltage range | VCC | 2.7 | 5.5 | V | ATmega644-20AU ordering table power supply | 15 | |
| Maximum speed grade | 20 | MHz | 20MHz @ 4.5V - 5.5V | 1 | |||
| Speed at 2.7V-5.5V | 0 | 10 | MHz | 2.7V - 5.5V | 1 | ||
| Speed at 4.5V-5.5V | 0 | 20 | MHz | 4.5V - 5.5V | 1 | ||
| Flash write/erase cycles | 10000 | cycles | Worst case temperature, guaranteed after last write cycle | 1 | |||
| EEPROM write/erase cycles | 100000 | cycles | Worst case temperature, guaranteed after last write cycle | 1 |
CAD (KiCad official)
- Symbol:
ATMEGA644-20AU - Footprint:
Package_QFP:TQFP-44_10x10mm_P0.8mm - 3D model: TQFP-44(10x10) (KiCad packages3D, STEP)
- 3D model files:
atmega644-20au-etched.step/atmega644-20au-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);atmega644-20au.step/atmega644-20au.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Microchip Tech datasheet (23 pp, sha256
40180a4e63a7d4d8, retrieved 2026-10-31, tier: manufacturer) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-5-5(text+vision), consensusclaude-opus-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).