component
ATSAML21J18B-AUT
Public Made by Adomby adom
Microchip Tech Microcontroller Units (MCUs/MPUs/SOCs), TQFP-64(10x10). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
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{
"slug": "atsaml21j18b-aut",
"version": "0.1.0",
"type": "component",
"description": "Microchip Tech Microcontroller Units (MCUs/MPUs/SOCs), TQFP-64(10x10). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
"tags": [
"component",
"single chip microcomputer-microcontroller",
"atsaml21j18b-aut",
"factory-2.0.0",
"extractor-text"
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"dependencies": {},
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"component": {
"mpn": "ATSAML21J18B-AUT",
"manufacturer": "Microchip Tech",
"package": "TQFP-64(10x10)",
"pin_count": 64,
"category": "Single Chip Microcomputer/Microcontroller",
"subcategory": "Microcontroller Units (MCUs/MPUs/SOCs)",
"datasheet": "https://datasheet.lcsc.com/datasheet/pdf/41942ba97f76aad6042188ffe9080a2f.pdf",
"parts": {
"symbol": "atsaml21j18b-aut.kicad_sym",
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"lbr": "atsaml21j18b-aut.lbr"
},
"distributor_links": {
"lcsc": "C2053781",
"digikey": "ATSAML21J18B-AUTTR-ND",
"mouser": "556-ATSAML21J18B-AUT"
},
"distributor_check": {
"checked_at": "2026-10-30T23:21:09Z",
"source": "Component Ocean /api/assign-pns",
"digikey": {
"pn": "ATSAML21J18B-AUTTR-ND",
"status": "found",
"lifecycle": "Active"
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"pn": "556-ATSAML21J18B-AUT",
"status": "found"
}
},
"pins": [
{
"number": "1",
"name": "PA00",
"type": "bidirectional",
"description": "PORT I/O pin on the VSWOUT supply, also multiplexed to EXTINT[0]/EXTWAKE[0], SERCOM1 PAD[0], TCC2 WO[0] and the XIN32 32 kHz oscillator input; it is a Backup pin with different properties than normal pins."
},
{
"number": "2",
"name": "PA01",
"type": "bidirectional",
"description": "PORT I/O pin on the VSWOUT supply, also multiplexed to EXTINT[1]/EXTWAKE[1], SERCOM1 PAD[1], TCC2 WO[1] and the XOUT32 32 kHz oscillator output; it is a Backup pin with different properties than normal pins."
},
{
"number": "3",
"name": "PA02",
"type": "bidirectional",
"description": "PORT I/O pin on the VDDANA domain, also multiplexed to EXTINT[2]/EXTWAKE[2], analog AIN[0], PTC Y[0], DAC VOUT[0] and OPAMP OA_NEG[0]; enabling an analog peripheral makes its analog output interfere with the alternative functions of this pin."
},
{
"number": "4",
"name": "PA03",
"type": "bidirectional",
"description": "PORT I/O pin on the VDDANA domain, also multiplexed to EXTINT[3]/EXTWAKE[3], VREFA, analog AIN[1] and PTC Y[1]; enabling an analog peripheral makes its analog output interfere with the alternative functions of this pin."
},
{
"number": "5",
"name": "PB04",
"type": "bidirectional",
"description": "PORT I/O pin on the VDDANA domain, also multiplexed to EXTINT[4], analog AIN[12] and PTC Y[10]."
},
{
"number": "6",
"name": "PB05",
"type": "bidirectional",
"description": "PORT I/O pin on the VDDANA domain, also multiplexed to EXTINT[5], analog AIN[13], PTC Y[11] and OPAMP OA_NEG[1]."
},
{
"number": "7",
"name": "GNDANA",
"type": "power_in",
"description": "Ground for the analog power domain, paired with VDDANA (pin 8)."
},
{
"number": "8",
"name": "VDDANA",
"type": "power_in",
"description": "Analog supply voltage of 1.6V to 3.6V, decoupled with 100nF and 10µF capacitors, with a ferrite bead to keep VDD noise out of the analog domain."
},
{
"number": "9",
"name": "PB06",
"type": "bidirectional",
"description": "PORT I/O pin on the VDDANA domain, also multiplexed to EXTINT[6], analog AIN[14], PTC Y[12], OPAMP OA_NEG[2] and CCL2 IN[0]."
},
{
"number": "10",
"name": "PB07",
"type": "bidirectional",
"description": "PORT I/O pin on the VDDANA domain, also multiplexed to EXTINT[7], analog AIN[15], PTC Y[13] and CCL2 IN[1]."
},
{
"number": "11",
"name": "PB08",
"type": "bidirectional",
"description": "PORT I/O pin on the VDDANA domain, also multiplexed to EXTINT[8], analog AIN[2], OPAMP OA_OUT[1], SERCOM4 PAD[0], TC0 WO[0] and CCL2 IN[2]; it is an analog-interference pin when an analog peripheral is enabled."
},
{
"number": "12",
"name": "PB09",
"type": "bidirectional",
"description": "PORT I/O pin on the VDDANA domain, also multiplexed to EXTINT[9], analog AIN[3], PTC Y[15], OPAMP OA_POS[1], SERCOM4 PAD[1], TC0 WO[1] and CCL2 OUT."
},
{
"number": "13",
"name": "PA04",
"type": "bidirectional",
"description": "PORT I/O pin on the VDDANA domain, also multiplexed to EXTINT[4]/EXTWAKE[4], VREFB, analog AIN[4] and AIN[0], OPAMP OA_OUT[2], SERCOM0 PAD[0], TCC0 WO[0] and CCL0 IN[0]."
},
{
"number": "14",
"name": "PA05",
"type": "bidirectional",
"description": "PORT I/O pin on the VDDANA domain, also multiplexed to EXTINT[5]/EXTWAKE[5], analog AIN[5] and AIN[1], DAC VOUT[1], OPAMP OA_POS[2], SERCOM0 PAD[1], TCC0 WO[1] and CCL0 IN[1]."
},
{
"number": "15",
"name": "PA06",
"type": "bidirectional",
"description": "PORT I/O pin on the VDDANA domain, also multiplexed to EXTINT[6]/EXTWAKE[6], analog AIN[6] and AIN[2], PTC Y[4], OPAMP OA_POS[0], SERCOM0 PAD[2], TCC1 WO[0] and CCL0 IN[2]."
},
{
"number": "16",
"name": "PA07",
"type": "bidirectional",
"description": "PORT I/O pin on the VDDANA domain, also multiplexed to EXTINT[7]/EXTWAKE[7], analog AIN[7] and AIN[3], OPAMP OA_OUT[0], SERCOM0 PAD[3], TCC1 WO[1] and CCL0 OUT."
},
{
"number": "17",
"name": "PA08",
"type": "bidirectional",
"description": "PORT I/O pin on the VDDIO supply, also multiplexed to NMI, analog AIN[16], PTC X[0]/Y[6], SERCOM0 PAD[0], SERCOM2 PAD[0], TCC0 WO[0], TCC1 WO[2] and CCL1 IN[0]; it is a High Sink pin and supports I2C."
},
{
"number": "18",
"name": "PA09",
"type": "bidirectional",
"description": "PORT I/O pin on the VDDIO supply, also multiplexed to EXTINT[9], analog AIN[17], PTC X[1]/Y[7], SERCOM0 PAD[1], SERCOM2 PAD[1], TCC0 WO[1], TCC1 WO[3] and CCL1 IN[1]; it is a High Sink pin and supports I2C."
},
{
"number": "19",
"name": "PA10",
"type": "bidirectional",
"description": "PORT I/O pin on the VDDIO supply, also multiplexed to EXTINT[10], analog AIN[18], PTC X[2]/Y[8], SERCOM0 PAD[2], SERCOM2 PAD[2], TCC1 WO[0], TCC0 WO[2], GCLK_IO[4] and CCL1 IN[2]."
},
{
"number": "20",
"name": "PA11",
"type": "bidirectional",
"description": "PORT I/O pin on the VDDIO supply, also multiplexed to EXTINT[11], analog AIN[19], PTC X[3]/Y[9], SERCOM0 PAD[3], SERCOM2 PAD[3], TCC1 WO[1], TCC0 WO[3], GCLK_IO[5] and CCL1 OUT."
},
{
"number": "21",
"name": "VDDIO",
"type": "power_in",
"description": "Digital I/O supply of 1.6V to 3.6V, decoupled with 100nF and 10µF capacitors, paired with GND pin 22."
},
{
"number": "22",
"name": "GND",
"type": "power_in",
"description": "Digital ground for the VDDIO domain."
},
{
"number": "23",
"name": "PB10",
"type": "bidirectional",
"description": "PORT I/O pin on the VDDIO supply, also multiplexed to EXTINT[10], PTC Y[2], SERCOM4 PAD[2], TC1 WO[0], TCC0 WO[4], GCLK_IO[4] and CCL1 IN[2]."
},
{
"number": "24",
"name": "PB11",
"type": "bidirectional",
"description": "PORT I/O pin on the VDDIO supply, also multiplexed to EXTINT[11], PTC Y[3], SERCOM4 PAD[3], TC1 WO[1], TCC0 WO[5], GCLK_IO[5] and CCL1 OUT."
},
{
"number": "25",
"name": "PB12",
"type": "bidirectional",
"description": "PORT I/O pin on the VDDIO supply, also multiplexed to EXTINT[12], PTC X[12]/Y[5], SERCOM4 PAD[0], TC0 WO[0], TCC0 WO[6] and GCLK_IO[6]; it supports I2C."
},
{
"number": "26",
"name": "PB13",
"type": "bidirectional",
"description": "PORT I/O pin on the VDDIO supply, also multiplexed to EXTINT[13], PTC X[13]/Y[14], SERCOM4 PAD[1], TC0 WO[1], TCC0 WO[7] and GCLK_IO[7]; it supports I2C."
},
{
"number": "27",
"name": "PB14",
"type": "bidirectional",
"description": "PORT I/O pin on the VDDIO supply, also multiplexed to EXTINT[14], PTC X[14], SERCOM4 PAD[2], TC1 WO[0], GCLK_IO[0] and CCL3 IN[0]."
},
{
"number": "28",
"name": "PB15",
"type": "bidirectional",
"description": "PORT I/O pin on the VDDIO supply, also multiplexed to EXTINT[15], PTC X[15], SERCOM4 PAD[3], TC1 WO[1], GCLK_IO[1] and CCL3 IN[1]."
},
{
"number": "29",
"name": "PA12",
"type": "bidirectional",
"description": "PORT I/O pin on the VDDIO supply, also multiplexed to EXTINT[12], SERCOM2 PAD[0], SERCOM4 PAD[0], TCC2 WO[0], TCC0 WO[6] and analog comparator AC CMP[0]; it supports I2C with reduced low-level output current in Sm/Fm modes."
},
{
"number": "30",
"name": "PA13",
"type": "bidirectional",
"description": "PORT I/O pin on the VDDIO supply, also multiplexed to EXTINT[13], SERCOM2 PAD[1], SERCOM4 PAD[1], TCC2 WO[1], TCC0 WO[7] and analog comparator AC CMP[1]; it supports I2C with reduced low-level output current in Sm/Fm modes."
},
{
"number": "31",
"name": "PA14",
"type": "bidirectional",
"description": "PORT I/O pin on the VDDIO supply, also multiplexed to EXTINT[14], SERCOM2 PAD[2], SERCOM4 PAD[2], TC4 WO[0], TCC0 WO[4] and GCLK_IO[0], and used as the XOSC crystal input XIN."
},
{
"number": "32",
"name": "PA15",
"type": "bidirectional",
"description": "PORT I/O pin on the VDDIO supply, also multiplexed to EXTINT[15], SERCOM2 PAD[3], SERCOM4 PAD[3], TC4 WO[1], TCC0 WO[5] and GCLK_IO[1], and used as the XOSC crystal output XOUT."
},
{
"number": "33",
"name": "GND",
"type": "power_in",
"description": "Digital ground for the second VDDIO domain, paired with VDDIO pin 34."
},
{
"number": "34",
"name": "VDDIO",
"type": "power_in",
"description": "Digital I/O supply of 1.6V to 3.6V, decoupled with 100nF and 10µF capacitors, paired with GND pin 33."
},
{
"number": "35",
"name": "PA16",
"type": "bidirectional",
"description": "PORT I/O pin on the VDDIO supply, also multiplexed to EXTINT[0], PTC X[4], SERCOM1 PAD[0], SERCOM3 PAD[0], TCC2 WO[0], TCC0 WO[6], GCLK_IO[2] and CCL0 IN[0]; it is a High Sink pin and supports I2C."
},
{
"number": "36",
"name": "PA17",
"type": "bidirectional",
"description": "PORT I/O pin on the VDDIO supply, also multiplexed to EXTINT[1], PTC X[5], SERCOM1 PAD[1], SERCOM3 PAD[1], TCC2 WO[1], TCC0 WO[7], GCLK_IO[3] and CCL0 IN[1]; it is a High Sink pin and supports I2C."
},
{
"number": "37",
"name": "PA18",
"type": "bidirectional",
"description": "PORT I/O pin on the VDDIO supply, also multiplexed to EXTINT[2], PTC X[6], SERCOM1 PAD[2], SERCOM3 PAD[2], TC4 WO[0], TCC0 WO[2], analog comparator AC CMP[0] and CCL0 IN[2]."
},
{
"number": "38",
"name": "PA19",
"type": "bidirectional",
"description": "PORT I/O pin on the VDDIO supply, also multiplexed to EXTINT[3], PTC X[7], SERCOM1 PAD[3], SERCOM3 PAD[3], TC4 WO[1], TCC0 WO[3], analog comparator AC CMP[1] and CCL0 OUT."
},
{
"number": "39",
"name": "PB16",
"type": "bidirectional",
"description": "PORT I/O pin on the VDDIO supply, also multiplexed to EXTINT[0], SERCOM5 PAD[0], TC2 WO[0], TCC0 WO[4], GCLK_IO[2] and CCL3 IN[2]; it supports I2C."
},
{
"number": "40",
"name": "PB17",
"type": "bidirectional",
"description": "PORT I/O pin on the VDDIO supply, also multiplexed to EXTINT[1], SERCOM5 PAD[1], TC2 WO[1], TCC0 WO[5], GCLK_IO[3] and CCL3 OUT; it supports I2C."
},
{
"number": "41",
"name": "PA20",
"type": "bidirectional",
"description": "PORT I/O pin on the VDDIO supply, also multiplexed to EXTINT[4], PTC X[8], SERCOM5 PAD[2], SERCOM3 PAD[2], TC3 WO[0], TCC0 WO[6] and GCLK_IO[4]."
},
{
"number": "42",
"name": "PA21",
"type": "bidirectional",
"description": "PORT I/O pin on the VDDIO supply, also multiplexed to EXTINT[5], PTC X[9], SERCOM5 PAD[3], SERCOM3 PAD[3], TC3 WO[1], TCC0 WO[7] and GCLK_IO[5]."
},
{
"number": "43",
"name": "PA22",
"type": "bidirectional",
"description": "PORT I/O pin on the VDDIO supply, also multiplexed to EXTINT[6], PTC X[10], SERCOM3 PAD[0], SERCOM5 PAD[0], TC0 WO[0], TCC0 WO[4], GCLK_IO[6] and CCL2 IN[0]; it is a High Sink pin and supports I2C."
},
{
"number": "44",
"name": "PA23",
"type": "bidirectional",
"description": "PORT I/O pin on the VDDIO supply, also multiplexed to EXTINT[7], PTC X[11], SERCOM3 PAD[1], SERCOM5 PAD[1], TC0 WO[1], TCC0 WO[5], the USB 1 kHz SOF output, GCLK_IO[7] and CCL2 IN[1]; it is a High Sink pin and supports I2C."
},
{
"number": "45",
"name": "PA24",
"type": "bidirectional",
"description": "PORT I/O pin on the VDDIO supply, also multiplexed to EXTINT[12], SERCOM3 PAD[2], SERCOM5 PAD[2], TC1 WO[0], TCC1 WO[2], USB DM and CCL2 IN[2]; its pull-up/pull-down resistance is 50 to 150 kΩ."
},
{
"number": "46",
"name": "PA25",
"type": "bidirectional",
"description": "PORT I/O pin on the VDDIO supply, also multiplexed to EXTINT[13], SERCOM3 PAD[3], SERCOM5 PAD[3], TC1 WO[1], TCC1 WO[3], USB DP and CCL2 OUT; its pull-up/pull-down resistance is 50 to 150 kΩ."
},
{
"number": "47",
"name": "GND",
"type": "power_in",
"description": "Digital ground for the third VDDIO domain, paired with VDDIO pin 48."
},
{
"number": "48",
"name": "VDDIO",
"type": "power_in",
"description": "Digital I/O supply of 1.6V to 3.6V, decoupled with 100nF and 10µF capacitors, paired with GND pin 47."
},
{
"number": "49",
"name": "PB22",
"type": "bidirectional",
"description": "PORT I/O pin on the VDDIN supply, also multiplexed to EXTINT[6], SERCOM5 PAD[2], TC3 WO[0], GCLK_IO[0] and CCL0 IN[0]."
},
{
"number": "50",
"name": "PB23",
"type": "bidirectional",
"description": "PORT I/O pin on the VDDIN supply, also multiplexed to EXTINT[7], SERCOM5 PAD[3], TC3 WO[1], GCLK_IO[1] and CCL0 OUT."
},
{
"number": "51",
"name": "PA27",
"type": "bidirectional",
"description": "PORT I/O pin on the VDDIN supply, also multiplexed to EXTINT[15] and GCLK_IO[0]; it is a High Sink pin."
},
{
"number": "52",
"name": "RESET",
"type": "input",
"description": "Active-low external reset input with an internal pull-up; the low threshold is below 0.33×VDDIO at 1.6-2.0V and below 0.36×VDDIO at 2.7-3.6V, and a 100nF filter capacitor with 330Ω series resistor is recommended for a reset switch."
},
{
"number": "53",
"name": "VSW",
"type": "power_out",
"description": "On-chip switching-mode regulator output, which must connect to VDDCORE through a 10µH inductor with saturation current above 150mA and DCR below 1Ω in switching mode and is not connected in linear regulator mode."
},
{
"number": "54",
"name": "GND",
"type": "power_in",
"description": "Ground for the VDDIN and core supply domain."
},
{
"number": "55",
"name": "VDDCORE",
"type": "power_out",
"description": "Core supply of 0.9V to 1.2V typical, decoupled with 100nF and 1µF capacitors, which is an output in linear regulator mode and an input connected to VSW through the inductor in switched regulator mode."
},
{
"number": "56",
"name": "VDDIN",
"type": "power_in",
"description": "Digital supply input of 1.6V to 3.6V, decoupled with 100nF and 10µF capacitors and filtered by a 10µH inductor from the external supply."
},
{
"number": "57",
"name": "PA30",
"type": "bidirectional",
"description": "PORT I/O pin on the VDDIN supply, also multiplexed to EXTINT[10], SERCOM1 PAD[2], TCC1 WO[0], GCLK_IO[0] and CCL1 IN[0], and used as the Serial Wire Debug clock SWCLK."
},
{
"number": "58",
"name": "PA31",
"type": "bidirectional",
"description": "PORT I/O pin on the VDDIN supply, also multiplexed to EXTINT[11], SERCOM1 PAD[3], TCC1 WO[1] and CCL1 OUT, and used as the Serial Wire Debug data pin SWDIO, which is only activated in the presence of a debugger; it is a High Sink pin."
},
{
"number": "59",
"name": "PB30",
"type": "bidirectional",
"description": "PORT I/O pin on the VDDIN supply, also multiplexed to EXTINT[14], SERCOM5 PAD[0], TCC0 WO[0] and TCC1 WO[2]; it supports I2C."
},
{
"number": "60",
"name": "PB31",
"type": "bidirectional",
"description": "PORT I/O pin on the VDDIN supply, also multiplexed to EXTINT[15], SERCOM5 PAD[1], TCC0 WO[1] and TCC1 WO[3]; it supports I2C."
},
{
"number": "61",
"name": "PB00",
"type": "bidirectional",
"description": "Backup-type PORT I/O pin on the VSWOUT supply, also multiplexed to EXTINT[0], analog AIN[8], SERCOM5 PAD[2], TC3 WO[0] and CCL0 IN[1], and used as the SUPC PSOK input."
},
{
"number": "62",
"name": "PB01",
"type": "bidirectional",
"description": "Backup-type PORT I/O pin on the VSWOUT supply, also multiplexed to EXTINT[1], analog AIN[9], SERCOM5 PAD[3], TC3 WO[1] and CCL0 IN[2], and used as the SUPC OUT[0] output."
},
{
"number": "63",
"name": "PB02",
"type": "bidirectional",
"description": "Backup-type PORT I/O pin on the VSWOUT supply, also multiplexed to EXTINT[2], analog AIN[10], SERCOM5 PAD[0], TC2 WO[0] and CCL0 OUT, and used as the SUPC OUT[1] output."
},
{
"number": "64",
"name": "PB03",
"type": "bidirectional",
"description": "Backup-type PORT I/O pin on the VSWOUT supply, also multiplexed to EXTINT[3], analog AIN[11], SERCOM5 PAD[1] and TC2 WO[1], and used as the SUPC VBAT battery supply input."
}
],
"provenance": {
"extractor": "extract_pins 0.3",
"factory_chain": {
"factory": "2.0.0",
"extractor": "extract_pins 0.3",
"primary_model": "claude-haiku-5-5",
"primary_mode": "text",
"consensus_model": "claude-sonnet-5-5",
"consensus": "agreed",
"guards": "pin_guards 0.1: passed",
"guard_notes": [
"extractor flagged: VSW and VDDCORE are power_out here, but the datasheet says VDDCORE is an input and VSW is an output ; Backup-domain pins (PA00, PA01, PB00-PB03) are powered from VSWOUT per the multiplexing table; the d; The package is listed as TQFP64 in the ordering table (page 17), but the 10x10 mm body size from the",
"8/64 pins cited to the wrong page (name found elsewhere): ['8:VDDANA@p1122', '21:VDDIO@p1122', '34:VDDIO@p1122', '48:VDDIO@p1122']"
],
"pages_sent": 119,
"cost_usd": 0.649,
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