component
EFM8BB21F16I-C-QFN20R
Public Made by Adomby adom
SKYWORKS SILICON LABS Microcontrollers (MCU/MPU/SOC), QFN-20-EP(3x3). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
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{
"slug": "efm8bb21f16i-c-qfn20r",
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"type": "component",
"description": "SKYWORKS SILICON LABS Microcontrollers (MCU/MPU/SOC), QFN-20-EP(3x3). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
"tags": [
"component",
"embedded processors & controllers",
"efm8bb21f16i-c-qfn20r",
"factory-2.0.0",
"extractor-text"
],
"dependencies": {},
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"component": {
"mpn": "EFM8BB21F16I-C-QFN20R",
"manufacturer": "SKYWORKS SILICON LABS",
"package": "QFN-20-EP(3x3)",
"pin_count": 21,
"category": "Embedded Processors & Controllers",
"subcategory": "Microcontrollers (MCU/MPU/SOC)",
"datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8589930628188696576",
"parts": {
"symbol": "efm8bb21f16i-c-qfn20r.kicad_sym",
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"model_3d_step_plain": "efm8bb21f16i-c-qfn20r.step",
"lbr": "efm8bb21f16i-c-qfn20r.lbr"
},
"distributor_links": {
"lcsc": "C2053222",
"digikey": "336-4847-2-ND",
"mouser": "634-BB21F16ICQFN20R"
},
"distributor_check": {
"checked_at": "2026-10-09T03:26:33Z",
"source": "Component Ocean /api/assign-pns",
"digikey": {
"pn": "336-4847-2-ND",
"status": "found",
"lifecycle": "Active"
},
"mouser": {
"pn": "634-BB21F16ICQFN20R",
"status": "found"
}
},
"pins": [
{
"number": "1",
"name": "P0.1",
"type": "bidirectional",
"description": "Multifunction I/O with crossbar capability, 5 V tolerant under bias; also carries P0MAT.1, INT0.1, INT1.1, ADC0.1, CMP0P.1, CMP0N.1 and AGND."
},
{
"number": "2",
"name": "P0.0",
"type": "bidirectional",
"description": "Multifunction I/O with crossbar capability, 5 V tolerant under bias; also carries P0MAT.0, INT0.0, INT1.0, ADC0.0, CMP0P.0, CMP0N.0 and VREF."
},
{
"number": "3",
"name": "GND",
"type": "power_in",
"description": "Ground reference for the device."
},
{
"number": "4",
"name": "VDD",
"type": "power_in",
"description": "Supply power input; the single supply is specified for 2.2 to 3.6 V on this QFN20 part, which has no 5 V regulator option."
},
{
"number": "5",
"name": "RSTb / C2CK",
"type": "input",
"description": "Active-low reset input shared with the C2 debug clock (C2CK)."
},
{
"number": "6",
"name": "P2.0 / C2D",
"type": "bidirectional",
"description": "Multifunction I/O with crossbar capability, 5 V tolerant under bias; shared with the C2 debug data pin (C2D) and carries P2MAT.0, ADC0.20, CMP1P.9 and CMP1N.9."
},
{
"number": "7",
"name": "P1.6",
"type": "bidirectional",
"description": "Multifunction I/O with crossbar capability, 5 V tolerant under bias; also carries P1MAT.6, ADC0.14, CMP1P.6 and CMP1N.6."
},
{
"number": "8",
"name": "P1.5",
"type": "bidirectional",
"description": "Multifunction I/O with crossbar capability, 5 V tolerant under bias; also carries P1MAT.5, ADC0.13, CMP1P.5 and CMP1N.5."
},
{
"number": "9",
"name": "P1.4",
"type": "bidirectional",
"description": "Multifunction I/O with crossbar capability, 5 V tolerant under bias; also carries P1MAT.4, ADC0.12, CMP1P.4 and CMP1N.4."
},
{
"number": "10",
"name": "P1.3",
"type": "bidirectional",
"description": "Multifunction I/O with crossbar capability, 5 V tolerant under bias; also carries P1MAT.3, I2C0_SCL, ADC0.11, CMP1P.3 and CMP1N.3."
},
{
"number": "11",
"name": "P1.2",
"type": "bidirectional",
"description": "Multifunction I/O with crossbar capability, 5 V tolerant under bias; also carries P1MAT.2, I2C0_SDA, ADC0.10, CMP1P.2 and CMP1N.2."
},
{
"number": "12",
"name": "GND",
"type": "power_in",
"description": "Ground reference for the device."
},
{
"number": "13",
"name": "P1.1",
"type": "bidirectional",
"description": "Multifunction I/O with crossbar capability, 5 V tolerant under bias; also carries P1MAT.1, ADC0.9, CMP1P.1, CMP1N.1, CMP0P.10 and CMP0N.10."
},
{
"number": "14",
"name": "P1.0",
"type": "bidirectional",
"description": "Multifunction I/O with crossbar capability, 5 V tolerant under bias; also carries P1MAT.0, ADC0.8, CMP1P.0, CMP1N.0, CMP0P.9 and CMP0N.9."
},
{
"number": "15",
"name": "P0.7",
"type": "bidirectional",
"description": "Multifunction I/O with crossbar capability, 5 V tolerant under bias; also carries P0MAT.7, INT0.7, INT1.7, ADC0.7, CMP0P.7 and CMP0N.7."
},
{
"number": "16",
"name": "P0.6",
"type": "bidirectional",
"description": "Multifunction I/O with crossbar capability, 5 V tolerant under bias; also carries P0MAT.6, CNVSTR, INT0.6, INT1.6, ADC0.6, CMP0P.6 and CMP0N.6."
},
{
"number": "17",
"name": "P0.5",
"type": "bidirectional",
"description": "Multifunction I/O with crossbar capability, 5 V tolerant under bias; also carries P0MAT.5, INT0.5, INT1.5, UART0_RX, ADC0.5, CMP0P.5 and CMP0N.5."
},
{
"number": "18",
"name": "P0.4",
"type": "bidirectional",
"description": "Multifunction I/O with crossbar capability, 5 V tolerant under bias; also carries P0MAT.4, INT0.4, INT1.4, UART0_TX, ADC0.4, CMP0P.4 and CMP0N.4."
},
{
"number": "19",
"name": "P0.3",
"type": "bidirectional",
"description": "Multifunction I/O with crossbar capability, 5 V tolerant under bias; also carries P0MAT.3, EXTCLK, INT0.3, INT1.3, ADC0.3, CMP0P.3 and CMP0N.3."
},
{
"number": "20",
"name": "P0.2",
"type": "bidirectional",
"description": "Multifunction I/O with crossbar capability, 5 V tolerant under bias; also carries P0MAT.2, INT0.2, INT1.2, ADC0.2, CMP0P.2 and CMP0N.2."
},
{
"number": "21",
"name": "GND",
"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-haiku-5-5",
"primary_mode": "text",
"consensus_model": "claude-sonnet-5-5",
"consensus": "agreed",
"guards": "pin_guards 0.1: passed",
"guard_notes": [
"extractor flagged: The QFN20 pinout includes a center ground pad (listed as 'Center GND Ground' in Table 6.3) that has ; The MPN ends in '-QFN20R'; the R is the tape-and-reel suffix and does not change the pinout. The pac; The datasheet gives the supply range as 2.2 to 3.6 V (or up to 5.25 V with the 5 V regulator option)",
"exposed pad 21 added from the footprint"
],
"pages_sent": 29,
"cost_usd": 0.1045,
"at": "2026-10-09T03:25:33"
},
"datasheet": {
"url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8589930628188696576",
"pages": 59,
"sha256": "68db19b3e729b537",
"source_tier": "lcsc"
},
"cad": "KiCad official (CC-BY-SA 4.0)",
"pins": {
"total": 21,
"described": 21,
"cites_pages": true,
"refuses_to_fabricate": true
}
},
"viewers": {
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"models_3d": [
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"role": "plain",
"up": "Z",
"units": "mm",
"origin": "footprint origin = pad-pattern centre",
"seat": "z = 0",
"extents_mm": [
3.0,
3.0,
0.52
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"zmin_mm": 0.0,
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"footprint_binding": "identity",
"sha256": "0ee4e1082236390795238cd34b082d96efd160d6292c636cc40201a5a30cdc63",
"checked": "2026-10-09",
"checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
},
{
"file": "efm8bb21f16i-c-qfn20r-etched.step",
"role": "eda",
"up": "Z",
"units": "mm",
"origin": "footprint origin = pad-pattern centre",
"seat": "z = 0",
"extents_mm": [
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3.0,
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"sha256": "3f262dc566c5f6581ee96c3b33d8b29fe86358025d1325ddd0a80d167fd4c01d",
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"checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
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}