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ATMEGA324A-MU
Public Made by Adomby adom
Microchip Tech Pre-ordered MCUs, VQFN-44-EP(7x7). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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ATMEGA324A-MU
Microchip Tech · Pre-ordered MCUs · VQFN-44-EP(7x7)
ATMEGA324A-MU from Microchip Tech, in a VQFN-44-EP(7x7). 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 bidirectional I/O with selectable internal pull-up; alternate functions MOSI, ICP3 and PCINT13. |
| 2 | PB6 | bidirectional | Port B bit 6, 8-bit bidirectional I/O with selectable internal pull-up; alternate functions MISO, OC3A and PCINT14. |
| 3 | PB7 | bidirectional | Port B bit 7, 8-bit bidirectional I/O with selectable internal pull-up; alternate functions SCK, OC3B 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, 8-bit bidirectional I/O with selectable internal pull-up; alternate functions RXD0 and PCINT24. |
| 10 | PD1 | bidirectional | Port D bit 1, 8-bit bidirectional I/O with selectable internal pull-up; alternate functions TXD0 and PCINT25. |
| 11 | PD2 | bidirectional | Port D bit 2, 8-bit bidirectional I/O with selectable internal pull-up; alternate functions RXD1, INT0 and PCINT26. |
| 12 | PD3 | bidirectional | Port D bit 3, 8-bit bidirectional I/O with selectable internal pull-up; alternate functions TXD1, INT1 and PCINT27. |
| 13 | PD4 | bidirectional | Port D bit 4, 8-bit bidirectional I/O with selectable internal pull-up; alternate functions XCK1, OC1B and PCINT28. |
| 14 | PD5 | bidirectional | Port D bit 5, 8-bit bidirectional I/O with selectable internal pull-up; alternate functions OC1A and PCINT29. |
| 15 | PD6 | bidirectional | Port D bit 6, 8-bit bidirectional I/O with selectable internal pull-up; alternate functions OC2B, ICP1 and PCINT30. |
| 16 | PD7 | bidirectional | Port D bit 7, 8-bit bidirectional 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, 8-bit bidirectional I/O with selectable internal pull-up; alternate functions SCL (TWI) and PCINT16. |
| 20 | PC1 | bidirectional | Port C bit 1, 8-bit bidirectional I/O with selectable internal pull-up; alternate functions SDA (TWI) and PCINT17. |
| 21 | PC2 | bidirectional | Port C bit 2, 8-bit bidirectional I/O with selectable internal pull-up; alternate functions TCK (JTAG) and PCINT18. |
| 22 | PC3 | bidirectional | Port C bit 3, 8-bit bidirectional I/O with selectable internal pull-up; alternate functions TMS (JTAG) and PCINT19. |
| 23 | PC4 | bidirectional | Port C bit 4, 8-bit bidirectional I/O with selectable internal pull-up; alternate functions TDO (JTAG) and PCINT20. |
| 24 | PC5 | bidirectional | Port C bit 5, 8-bit bidirectional I/O with selectable internal pull-up; alternate functions TDI (JTAG) and PCINT21. |
| 25 | PC6 | bidirectional | Port C bit 6, 8-bit bidirectional I/O with selectable internal pull-up; alternate functions TOSC1 and PCINT22. |
| 26 | PC7 | bidirectional | Port C bit 7, 8-bit bidirectional I/O with selectable internal pull-up; alternate functions TOSC2 and PCINT23. |
| 27 | AVCC | power_in | Supply voltage pin for Port A and the ADC; must 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, 8-bit bidirectional I/O with selectable internal pull-up; analog input ADC7 and PCINT7. |
| 31 | PA6 | bidirectional | Port A bit 6, 8-bit bidirectional I/O with selectable internal pull-up; analog input ADC6 and PCINT6. |
| 32 | PA5 | bidirectional | Port A bit 5, 8-bit bidirectional I/O with selectable internal pull-up; analog input ADC5 and PCINT5. |
| 33 | PA4 | bidirectional | Port A bit 4, 8-bit bidirectional I/O with selectable internal pull-up; analog input ADC4 and PCINT4. |
| 34 | PA3 | bidirectional | Port A bit 3, 8-bit bidirectional I/O with selectable internal pull-up; analog input ADC3 and PCINT3. |
| 35 | PA2 | bidirectional | Port A bit 2, 8-bit bidirectional I/O with selectable internal pull-up; analog input ADC2 and PCINT2. |
| 36 | PA1 | bidirectional | Port A bit 1, 8-bit bidirectional I/O with selectable internal pull-up; analog input ADC1 and PCINT1. |
| 37 | PA0 | bidirectional | Port A bit 0, 8-bit bidirectional I/O with selectable internal pull-up; analog input ADC0 and PCINT0. |
| 38 | VCC | power_in | Digital supply voltage. |
| 39 | GND | power_in | Ground. |
| 40 | PB0 | bidirectional | Port B bit 0, 8-bit bidirectional I/O with selectable internal pull-up; alternate functions T0, XCK0 and PCINT8. |
| 41 | PB1 | bidirectional | Port B bit 1, 8-bit bidirectional I/O with selectable internal pull-up; alternate functions T1, CLKO and PCINT9. |
| 42 | PB2 | bidirectional | Port B bit 2, 8-bit bidirectional I/O with selectable internal pull-up; alternate functions AIN0, INT2 and PCINT10. |
| 43 | PB3 | bidirectional | Port B bit 3, 8-bit bidirectional I/O with selectable internal pull-up; alternate functions AIN1, OC0A and PCINT11. |
| 44 | PB4 | bidirectional | Port B bit 4, 8-bit bidirectional I/O with selectable internal pull-up; alternate functions SS, OC0B and PCINT12. |
| 45 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Microchip Tech |
| Package | VQFN-44-EP(7x7) |
| Category | Embedded Processors & Controllers |
| Pins | 45 |
CAD (KiCad official)
- Symbol:
ATMEGA324A-MU - Footprint:
Package_DFN_QFN:QFN-44-1EP_7x7mm_P0.5mm_EP5.15x5.15mm - 3D model: VQFN-44-EP(7x7) (KiCad packages3D, STEP)
- 3D model files:
atmega324a-mu-etched.step/atmega324a-mu-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);atmega324a-mu.step/atmega324a-mu.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Microchip Tech datasheet (672 pp, sha256
b5ee49362803dc70, retrieved 2026-10-27, tier: lcsc) - 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).
# ATMEGA324A-MU
**Microchip Tech** · Pre-ordered MCUs · VQFN-44-EP(7x7)
ATMEGA324A-MU from Microchip Tech, in a VQFN-44-EP(7x7). 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 bidirectional I/O with selectable internal pull-up; alternate functions MOSI, ICP3 and PCINT13. |
| 2 | PB6 | bidirectional | Port B bit 6, 8-bit bidirectional I/O with selectable internal pull-up; alternate functions MISO, OC3A and PCINT14. |
| 3 | PB7 | bidirectional | Port B bit 7, 8-bit bidirectional I/O with selectable internal pull-up; alternate functions SCK, OC3B 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, 8-bit bidirectional I/O with selectable internal pull-up; alternate functions RXD0 and PCINT24. |
| 10 | PD1 | bidirectional | Port D bit 1, 8-bit bidirectional I/O with selectable internal pull-up; alternate functions TXD0 and PCINT25. |
| 11 | PD2 | bidirectional | Port D bit 2, 8-bit bidirectional I/O with selectable internal pull-up; alternate functions RXD1, INT0 and PCINT26. |
| 12 | PD3 | bidirectional | Port D bit 3, 8-bit bidirectional I/O with selectable internal pull-up; alternate functions TXD1, INT1 and PCINT27. |
| 13 | PD4 | bidirectional | Port D bit 4, 8-bit bidirectional I/O with selectable internal pull-up; alternate functions XCK1, OC1B and PCINT28. |
| 14 | PD5 | bidirectional | Port D bit 5, 8-bit bidirectional I/O with selectable internal pull-up; alternate functions OC1A and PCINT29. |
| 15 | PD6 | bidirectional | Port D bit 6, 8-bit bidirectional I/O with selectable internal pull-up; alternate functions OC2B, ICP1 and PCINT30. |
| 16 | PD7 | bidirectional | Port D bit 7, 8-bit bidirectional 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, 8-bit bidirectional I/O with selectable internal pull-up; alternate functions SCL (TWI) and PCINT16. |
| 20 | PC1 | bidirectional | Port C bit 1, 8-bit bidirectional I/O with selectable internal pull-up; alternate functions SDA (TWI) and PCINT17. |
| 21 | PC2 | bidirectional | Port C bit 2, 8-bit bidirectional I/O with selectable internal pull-up; alternate functions TCK (JTAG) and PCINT18. |
| 22 | PC3 | bidirectional | Port C bit 3, 8-bit bidirectional I/O with selectable internal pull-up; alternate functions TMS (JTAG) and PCINT19. |
| 23 | PC4 | bidirectional | Port C bit 4, 8-bit bidirectional I/O with selectable internal pull-up; alternate functions TDO (JTAG) and PCINT20. |
| 24 | PC5 | bidirectional | Port C bit 5, 8-bit bidirectional I/O with selectable internal pull-up; alternate functions TDI (JTAG) and PCINT21. |
| 25 | PC6 | bidirectional | Port C bit 6, 8-bit bidirectional I/O with selectable internal pull-up; alternate functions TOSC1 and PCINT22. |
| 26 | PC7 | bidirectional | Port C bit 7, 8-bit bidirectional I/O with selectable internal pull-up; alternate functions TOSC2 and PCINT23. |
| 27 | AVCC | power_in | Supply voltage pin for Port A and the ADC; must 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, 8-bit bidirectional I/O with selectable internal pull-up; analog input ADC7 and PCINT7. |
| 31 | PA6 | bidirectional | Port A bit 6, 8-bit bidirectional I/O with selectable internal pull-up; analog input ADC6 and PCINT6. |
| 32 | PA5 | bidirectional | Port A bit 5, 8-bit bidirectional I/O with selectable internal pull-up; analog input ADC5 and PCINT5. |
| 33 | PA4 | bidirectional | Port A bit 4, 8-bit bidirectional I/O with selectable internal pull-up; analog input ADC4 and PCINT4. |
| 34 | PA3 | bidirectional | Port A bit 3, 8-bit bidirectional I/O with selectable internal pull-up; analog input ADC3 and PCINT3. |
| 35 | PA2 | bidirectional | Port A bit 2, 8-bit bidirectional I/O with selectable internal pull-up; analog input ADC2 and PCINT2. |
| 36 | PA1 | bidirectional | Port A bit 1, 8-bit bidirectional I/O with selectable internal pull-up; analog input ADC1 and PCINT1. |
| 37 | PA0 | bidirectional | Port A bit 0, 8-bit bidirectional I/O with selectable internal pull-up; analog input ADC0 and PCINT0. |
| 38 | VCC | power_in | Digital supply voltage. |
| 39 | GND | power_in | Ground. |
| 40 | PB0 | bidirectional | Port B bit 0, 8-bit bidirectional I/O with selectable internal pull-up; alternate functions T0, XCK0 and PCINT8. |
| 41 | PB1 | bidirectional | Port B bit 1, 8-bit bidirectional I/O with selectable internal pull-up; alternate functions T1, CLKO and PCINT9. |
| 42 | PB2 | bidirectional | Port B bit 2, 8-bit bidirectional I/O with selectable internal pull-up; alternate functions AIN0, INT2 and PCINT10. |
| 43 | PB3 | bidirectional | Port B bit 3, 8-bit bidirectional I/O with selectable internal pull-up; alternate functions AIN1, OC0A and PCINT11. |
| 44 | PB4 | bidirectional | Port B bit 4, 8-bit bidirectional I/O with selectable internal pull-up; alternate functions SS, OC0B and PCINT12. |
| 45 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Microchip Tech |
| Package | VQFN-44-EP(7x7) |
| Category | Embedded Processors & Controllers |
| Pins | 45 |
## CAD (KiCad official)
- Symbol: `ATMEGA324A-MU`
- Footprint: `Package_DFN_QFN:QFN-44-1EP_7x7mm_P0.5mm_EP5.15x5.15mm`
- 3D model: VQFN-44-EP(7x7) (KiCad packages3D, STEP)
- 3D model files: `atmega324a-mu-etched.step` / `atmega324a-mu-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `atmega324a-mu.step` / `atmega324a-mu.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [Microchip Tech datasheet](https://ww1.microchip.com/downloads/aemDocuments/documents/MCU08/ProductDocuments/DataSheets/ATmega164A_PA-324A_PA-644A_PA-1284_P_Data-Sheet-40002070B.pdf) (672 pp, sha256 `b5ee49362803dc70`, retrieved 2026-10-27, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text+vision), consensus `claude-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).
[Datasheet PDF](docs/atmega324a-mu-datasheet.pdf)