component
ATMEGA644PA-MU
Public Made by Adomby adom
Microchip Tech Pre-ordered MCUs, VQFN-44(7x7). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
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{
"schema_version": 1,
"type": "component",
"slug": "atmega644pa-mu",
"title": "ATMEGA644PA-MU",
"brief": "Microchip Tech Pre-ordered MCUs, VQFN-44(7x7). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
"version": "0.1.0",
"license": "CC-BY-SA-4.0",
"tags": [
"component",
"embedded processors & controllers",
"atmega644pa-mu",
"factory-2.0.0",
"extractor-text"
],
"component": {
"mpn": "ATMEGA644PA-MU",
"manufacturer": "Microchip Tech",
"package": "VQFN-44(7x7)",
"pin_count": 45,
"category": "Embedded Processors & Controllers",
"subcategory": "Pre-ordered MCUs",
"datasheet": "https://ww1.microchip.com/downloads/aemDocuments/documents/MCU08/ProductDocuments/DataSheets/ATmega164A_PA-324A_PA-644A_PA-1284_P_Data-Sheet-40002070B.pdf",
"parts": {
"symbol": "atmega644pa-mu.kicad_sym",
"footprint": "atmega644pa-mu.kicad_mod",
"model_3d": "atmega644pa-mu-hero.glb",
"model_3d_plain": "atmega644pa-mu-etched.glb",
"model_3d_step": "atmega644pa-mu-etched.step",
"model_3d_step_plain": "atmega644pa-mu.step",
"lbr": "atmega644pa-mu.lbr"
},
"distributor_links": {
"lcsc": "C1337454",
"digikey": "ATMEGA644PA-MU-ND"
},
"distributor_check": {
"checked_at": "2026-10-31T18:49:39Z",
"source": "Component Ocean /api/assign-pns",
"digikey": {
"pn": "ATMEGA644PA-MU-ND",
"status": "found"
},
"mouser": {
"pn": null,
"status": "quota"
}
},
"pins": [
{
"number": "1",
"name": "PB5",
"type": "bidirectional",
"description": "Port B bit 5, 8-bit bidirectional I/O with internal pull-up; alternate functions MOSI (SPI), ICP3 and PCINT13."
},
{
"number": "2",
"name": "PB6",
"type": "bidirectional",
"description": "Port B bit 6, bidirectional I/O with internal pull-up; alternate functions MISO (SPI), OC3A and PCINT14."
},
{
"number": "3",
"name": "PB7",
"type": "bidirectional",
"description": "Port B bit 7, bidirectional I/O with internal pull-up; alternate functions SCK (SPI), OC3B and PCINT15."
},
{
"number": "4",
"name": "RESET",
"type": "input",
"description": "Reset input; a low level longer than the minimum pulse length generates a reset even if the clock is not running."
},
{
"number": "5",
"name": "VCC",
"type": "power_in",
"description": "Digital supply voltage."
},
{
"number": "6",
"name": "GND",
"type": "power_in",
"description": "Ground."
},
{
"number": "7",
"name": "XTAL2",
"type": "output",
"description": "Output from the inverting oscillator amplifier."
},
{
"number": "8",
"name": "XTAL1",
"type": "input",
"description": "Input to the inverting oscillator amplifier and input to the internal clock operating circuit."
},
{
"number": "9",
"name": "PD0",
"type": "bidirectional",
"description": "Port D bit 0, bidirectional I/O with internal pull-up; alternate functions RXD0 (USART0 receive) and PCINT24 (T3 only on ATmega1284/1284P)."
},
{
"number": "10",
"name": "PD1",
"type": "bidirectional",
"description": "Port D bit 1, bidirectional I/O with internal pull-up; alternate functions TXD0 (USART0 transmit) and PCINT25."
},
{
"number": "11",
"name": "PD2",
"type": "bidirectional",
"description": "Port D bit 2, bidirectional I/O with internal pull-up; alternate functions RXD1 (USART1 receive), INT0 and PCINT26."
},
{
"number": "12",
"name": "PD3",
"type": "bidirectional",
"description": "Port D bit 3, bidirectional I/O with internal pull-up; alternate functions TXD1 (USART1 transmit), INT1 and PCINT27."
},
{
"number": "13",
"name": "PD4",
"type": "bidirectional",
"description": "Port D bit 4, bidirectional I/O with internal pull-up; alternate functions OC1B, XCK1 (USART1 external clock) and PCINT28."
},
{
"number": "14",
"name": "PD5",
"type": "bidirectional",
"description": "Port D bit 5, bidirectional I/O with internal pull-up; alternate functions OC1A and PCINT29."
},
{
"number": "15",
"name": "PD6",
"type": "bidirectional",
"description": "Port D bit 6, bidirectional I/O with internal pull-up; alternate functions ICP1, OC2B and PCINT30."
},
{
"number": "16",
"name": "PD7",
"type": "bidirectional",
"description": "Port D bit 7, bidirectional I/O with internal pull-up; alternate functions OC2A and PCINT31."
},
{
"number": "17",
"name": "VCC",
"type": "power_in",
"description": "Digital supply voltage."
},
{
"number": "18",
"name": "GND",
"type": "power_in",
"description": "Ground."
},
{
"number": "19",
"name": "PC0",
"type": "bidirectional",
"description": "Port C bit 0, bidirectional I/O with internal pull-up; alternate functions SCL (two-wire interface) and PCINT16."
},
{
"number": "20",
"name": "PC1",
"type": "bidirectional",
"description": "Port C bit 1, bidirectional I/O with internal pull-up; alternate functions SDA (two-wire interface) and PCINT17."
},
{
"number": "21",
"name": "PC2",
"type": "bidirectional",
"description": "Port C bit 2, bidirectional I/O with internal pull-up; alternate functions TCK (JTAG) and PCINT18."
},
{
"number": "22",
"name": "PC3",
"type": "bidirectional",
"description": "Port C bit 3, bidirectional I/O with internal pull-up; alternate functions TMS (JTAG) and PCINT19."
},
{
"number": "23",
"name": "PC4",
"type": "bidirectional",
"description": "Port C bit 4, bidirectional I/O with internal pull-up; alternate functions TDO (JTAG) and PCINT20."
},
{
"number": "24",
"name": "PC5",
"type": "bidirectional",
"description": "Port C bit 5, bidirectional I/O with internal pull-up; alternate functions TDI (JTAG) and PCINT21."
},
{
"number": "25",
"name": "PC6",
"type": "bidirectional",
"description": "Port C bit 6, bidirectional I/O with internal pull-up; alternate functions TOSC1 (Timer/Counter2 oscillator) and PCINT22."
},
{
"number": "26",
"name": "PC7",
"type": "bidirectional",
"description": "Port C bit 7, bidirectional I/O with internal pull-up; alternate functions TOSC2 (Timer/Counter2 oscillator) and PCINT23."
},
{
"number": "27",
"name": "AVCC",
"type": "power_in",
"description": "Supply voltage pin for Port A and the ADC; must be connected to VCC even if the ADC is not used, and through a low-pass filter if the ADC is used."
},
{
"number": "28",
"name": "GND",
"type": "power_in",
"description": "Ground."
},
{
"number": "29",
"name": "AREF",
"type": "input",
"description": "Analog reference pin for the analog-to-digital converter."
},
{
"number": "30",
"name": "PA7",
"type": "bidirectional",
"description": "Port A bit 7, ADC7 analog input and bidirectional I/O with internal pull-up; also PCINT7."
},
{
"number": "31",
"name": "PA6",
"type": "bidirectional",
"description": "Port A bit 6, ADC6 analog input and bidirectional I/O with internal pull-up; also PCINT6."
},
{
"number": "32",
"name": "PA5",
"type": "bidirectional",
"description": "Port A bit 5, ADC5 analog input and bidirectional I/O with internal pull-up; also PCINT5."
},
{
"number": "33",
"name": "PA4",
"type": "bidirectional",
"description": "Port A bit 4, ADC4 analog input and bidirectional I/O with internal pull-up; also PCINT4."
},
{
"number": "34",
"name": "PA3",
"type": "bidirectional",
"description": "Port A bit 3, ADC3 analog input and bidirectional I/O with internal pull-up; also PCINT3."
},
{
"number": "35",
"name": "PA2",
"type": "bidirectional",
"description": "Port A bit 2, ADC2 analog input and bidirectional I/O with internal pull-up; also PCINT2."
},
{
"number": "36",
"name": "PA1",
"type": "bidirectional",
"description": "Port A bit 1, ADC1 analog input and bidirectional I/O with internal pull-up; also PCINT1."
},
{
"number": "37",
"name": "PA0",
"type": "bidirectional",
"description": "Port A bit 0, ADC0 analog input and bidirectional I/O with internal pull-up; also PCINT0."
},
{
"number": "38",
"name": "VCC",
"type": "power_in",
"description": "Digital supply voltage."
},
{
"number": "39",
"name": "GND",
"type": "power_in",
"description": "Ground."
},
{
"number": "40",
"name": "PB0",
"type": "bidirectional",
"description": "Port B bit 0, bidirectional I/O with internal pull-up; alternate functions T0, XCK0 (USART0 external clock) and PCINT8."
},
{
"number": "41",
"name": "PB1",
"type": "bidirectional",
"description": "Port B bit 1, bidirectional I/O with internal pull-up; alternate functions T1, CLKO (divided system clock output) and PCINT9."
},
{
"number": "42",
"name": "PB2",
"type": "bidirectional",
"description": "Port B bit 2, bidirectional I/O with internal pull-up; alternate functions AIN0 (comparator positive input), INT2 and PCINT10."
},
{
"number": "43",
"name": "PB3",
"type": "bidirectional",
"description": "Port B bit 3, bidirectional I/O with internal pull-up; alternate functions AIN1 (comparator negative input), OC0A and PCINT11."
},
{
"number": "44",
"name": "PB4",
"type": "bidirectional",
"description": "Port B bit 4, bidirectional I/O with internal pull-up; alternate functions SS (SPI slave select), OC0B and PCINT12."
},
{
"number": "45",
"name": "EP",
"type": "passive",
"description": "Exposed pad (from the footprint; not named in the datasheet pin table)."
}
],
"provenance": {
"extractor": "extract_pins 0.3",
"factory_chain": {
"factory": "2.0.0",
"extractor": "extract_pins 0.3",
"primary_model": "claude-sonnet-5-5",
"primary_mode": "text",
"consensus_model": "claude-sonnet-5-5",
"consensus": "agreed",
"guards": "pin_guards 0.1: passed",
"guard_notes": [
"extractor flagged: The extracted pinout figure on page 11 lists pin names without printed pin numbers. Numbers 1-44 wer; The datasheet says the large center pad under the VQFN must be soldered to ground. It gives no pad n; The 44M1 ordering/package mapping is shown only for ATmega1284P in the provided pages. The ATmega644",
"23/45 pins cited to the wrong page (name found elsewhere): ['7:XTAL2@p16', '8:XTAL1@p16', '14:PD5@p11', '15:PD6@p11']"
],
"pages_sent": 115,
"cost_usd": 1.0538,
"at": "2026-10-31T18:49:31"
},
"datasheet": {
"url": "https://ww1.microchip.com/downloads/aemDocuments/documents/MCU08/ProductDocuments/DataSheets/ATmega164A_PA-324A_PA-644A_PA-1284_P_Data-Sheet-40002070B.pdf",
"pages": 672,
"sha256": "b5ee49362803dc70",
"source_tier": "mfr"
},
"cad": "KiCad official (CC-BY-SA 4.0)",
"pins": {
"total": 45,
"described": 45,
"cites_pages": true,
"refuses_to_fabricate": true
}
},
"viewers": {
"symbol": "viewers/symbol.html",
"footprint": "viewers/footprint.html"
},
"models_3d": [
{
"file": "atmega644pa-mu.step",
"role": "plain",
"up": "Z",
"units": "mm",
"origin": "footprint origin = pad-pattern centre",
"seat": "z = 0",
"extents_mm": [
7,
7,
0.77
],
"zmin_mm": 0,
"centre_offset_mm": 0,
"footprint_binding": "identity",
"sha256": "e095902326bdaee7dcc9926c9d1613852bfa37bad68a82560157ca7fe509925a",
"checked": "2026-10-31",
"checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
},
{
"file": "atmega644pa-mu-etched.step",
"role": "eda",
"up": "Z",
"units": "mm",
"origin": "footprint origin = pad-pattern centre",
"seat": "z = 0",
"extents_mm": [
7,
7,
0.77
],
"zmin_mm": 0,
"centre_offset_mm": 0,
"footprint_binding": "identity",
"sha256": "875b2af0e144abcdf1c1801732ddb26411abaf603ef9a306b6d067e1f1c3cd62",
"checked": "2026-10-31",
"checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
}
],
"package_dims": {
"package_code": "44M1",
"source_page": 656,
"D": {
"nom_mm": 7,
"range_mm": [
null,
null
]
},
"E1": {
"nom_mm": 7,
"range_mm": [
null,
null
]
},
"e": {
"nom_mm": 0.5,
"range_mm": [
null,
null
]
},
"A": {
"nom_mm": 0.9,
"range_mm": [
0.8,
1
]
},
"source": "datasheet package drawing, every number found on its page (extract_pins --task dims)",
"model_check": {
"file": "atmega644pa-mu.step",
"verdict": "PASS",
"reasons": [
"height within the datasheet's package drawing"
],
"by": "factory/package_fit.py"
}
}
},
"metadata": {
"specs": {
"Manufacturer": "Microchip Tech",
"Package": "VQFN-44(7x7)",
"Category": "Embedded Processors & Controllers",
"Pins": "45"
},
"characteristics": {
"version": 1,
"source": "datasheet",
"datasheet_sha256": "b5ee49362803dc705961f724da40af85ec14fbc03102b1716f0092775a679561",
"rows": [
{
"name": "Input Low Voltage, except XTAL1 and RESET (VCC 1.8-2.4V)",
"symbol": "VIL",
"kind": "electrical",
"unit": "V",
"min": -0.5,
"typ": null,
"max": 0.2,
"conditions": "VCC = 1.8V - 2.4V; max printed as 0.2VCC",
"source_page": 326,
"source": "datasheet"
},
{
"name": "Input Low Voltage, except XTAL1 and RESET (VCC 2.4-5.5V)",
"symbol": "VIL",
"kind": "electrical",
"unit": "V",
"min": -0.5,
"typ": null,
"max": 0.3,
"conditions": "VCC = 2.4V - 5.5V; max printed as 0.3VCC",
"source_page": 326,
"source": "datasheet"
},
{
"name": "Input Low Voltage, XTAL1 pin",
"symbol": "VIL1",
"kind": "electrical",
"unit": "V",
"min": -0.5,
"typ": null,
"max": 0.1,
"conditions": "VCC = 1.8V - 5.5V; max printed as 0.1VCC",
"source_page": 326,
"source": "datasheet"
},
{
"name": "Input Low Voltage, RESET pin",
"symbol": "VIL2",
"kind": "electrical",
"unit": "V",
"min": -0.5,
"typ": null,
"max": 0.1,
"conditions": "VCC = 1.8V - 5.5V; max printed as 0.1VCC",
"source_page": 326,
"source": "datasheet"
},
{
"name": "Input High Voltage, except XTAL1 and RESET (VCC 1.8-2.4V)",
"symbol": "VIH",
"kind": "electrical",
"unit": "V",
"min": 0.7,
"typ": null,
"max": null,
"conditions": "VCC = 1.8V - 2.4V; min printed as 0.7VCC, max VCC + 0.5",
"source_page": 326,
"source": "datasheet"
},
{
"name": "Input High Voltage, except XTAL1 and RESET (VCC 2.4-5.5V)",
"symbol": "VIH",
"kind": "electrical",
"unit": "V",
"min": 0.6,
"typ": null,
"max": null,
"conditions": "VCC = 2.4V - 5.5V; min printed as 0.6VCC, max VCC + 0.5",
"source_page": 326,
"source": "datasheet"
},
{
"name": "Input High Voltage, XTAL1 pin (VCC 1.8-2.4V)",
"symbol": "VIH1",
"kind": "electrical",
"unit": "V",
"min": 0.8,
"typ": null,
"max": null,
"conditions": "VCC = 1.8V - 2.4V; min printed as 0.8VCC, max VCC + 0.5",
"source_page": 326,
"source": "datasheet"
},
{
"name": "Input High Voltage, XTAL1 pin (VCC 2.4-5.5V)",
"symbol": "VIH1",
"kind": "electrical",
"unit": "V",
"min": 0.7,
"typ": null,
"max": null,
"conditions": "VCC = 2.4V - 5.5V; min printed as 0.7VCC, max VCC + 0.5",
"source_page": 326,
"source": "datasheet"
},
{
"name": "Input High Voltage, RESET pin",
"symbol": "VIH2",
"kind": "electrical",
"unit": "V",
"min": 0.9,
"typ": null,
"max": null,
"conditions": "VCC = 1.8V - 5.5V; min printed as 0.9VCC, max VCC + 0.5",
"source_page": 326,
"source": "datasheet"
},
{
"name": "Output Low Voltage (5V)",
"symbol": "VOL",
"kind": "electrical",
"unit": "V",
"min": null,
"typ": null,
"max": 0.9,
"conditions": "IOL = 20mA, VCC = 5V",
"source_page": 326,
"source": "datasheet"
},
{
"name": "Output Low Voltage (3V)",
"symbol": "VOL",
"kind": "electrical",
"unit": "V",
"min": null,
"typ": null,
"max": 0.6,
"conditions": "IOL = 10mA, VCC = 3V",
"source_page": 326,
"source": "datasheet"
},
{
"name": "Output High Voltage (5V)",
"symbol": "VOH",
"kind": "electrical",
"unit": "V",
"min": 4.2,
"typ": null,
"max": null,
"conditions": "IOH = -20mA, VCC = 5V",
"source_page": 326,
"source": "datasheet"
},
{
"name": "Output High Voltage (3V)",
"symbol": "VOH",
"kind": "electrical",
"unit": "V",
"min": 2.3,
"typ": null,
"max": null,
"conditions": "IOH = -10mA, VCC = 3V",
"source_page": 326,
"source": "datasheet"
},
{
"name": "Input Leakage Current I/O Pin, pin low",
"symbol": "IIL",
"kind": "electrical",
"unit": "µA",
"min": null,
"typ": null,
"max": 1,
"conditions": "VCC = 5.5V, pin low (absolute value)",
"source_page": 326,
"source": "datasheet"
},
{
"name": "Input Leakage Current I/O Pin, pin high",
"symbol": "IIH",
"kind": "electrical",
"unit": "µA",
"min": null,
"typ": null,
"max": 1,
"conditions": "VCC = 5.5V, pin high (absolute value)",
"source_page": 326,
"source": "datasheet"
},
{
"name": "Reset Pull-up Resistor",
"symbol": "RRST",
"kind": "electrical",
"unit": "kΩ",
"min": 30,
"typ": null,
"max": 60,
"conditions": "",
"source_page": 326,
"source": "datasheet"
},
{
"name": "I/O Pin Pull-up Resistor",
"symbol": "RPU",
"kind": "electrical",
"unit": "kΩ",
"min": 20,
"typ": null,
"max": 50,
"conditions": "",
"source_page": 326,
"source": "datasheet"
},
{
"name": "Analog Comparator Input Offset Voltage",
"symbol": "VACIO",
"kind": "electrical",
"unit": "mV",
"min": null,
"typ": 10,
"max": 40,
"conditions": "VCC = 5V, Vin = VCC/2; typ printed as <10",
"source_page": 326,
"source": "datasheet"
},
{
"name": "Analog Comparator Input Offset Voltage (VCC < 3.6V)",
"symbol": "VACIO",
"kind": "electrical",
"unit": "mV",
"min": null,
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