component
STC90C516AD-40I-LQFP44
Public Made by Adomby adom
STC Micro Microcontrollers (MCU/MPU/SOC), LQFP-44(10x10). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
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"version": "0.1.0",
"type": "component",
"description": "STC Micro Microcontrollers (MCU/MPU/SOC), LQFP-44(10x10). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
"tags": [
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"component": {
"mpn": "STC90C516AD-40I-LQFP44",
"manufacturer": "STC Micro",
"package": "LQFP-44(10x10)",
"pin_count": 44,
"category": "Embedded Processors & Controllers",
"subcategory": "Microcontrollers (MCU/MPU/SOC)",
"datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8586172911534792704",
"parts": {
"symbol": "stc90c516ad-40i-lqfp44.kicad_sym",
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"lbr": "stc90c516ad-40i-lqfp44.lbr"
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"distributor_links": {
"lcsc": "C8769"
},
"distributor_check": {
"checked_at": "2026-10-20T17:32:14Z",
"source": "Component Ocean /api/assign-pns",
"digikey": {
"pn": null,
"status": "no match"
},
"mouser": {
"pn": null,
"status": "no match"
}
},
"pins": [
{
"number": "1",
"name": "P1.5",
"type": "bidirectional",
"description": "Standard quasi-bidirectional I/O port pin PORT1[5]; no alternate function is listed for this pin in the LQFP44 table."
},
{
"number": "2",
"name": "P1.6",
"type": "bidirectional",
"description": "Standard quasi-bidirectional I/O port pin PORT1[6]; no alternate function is listed for this pin in the LQFP44 table."
},
{
"number": "3",
"name": "P1.7",
"type": "bidirectional",
"description": "Standard quasi-bidirectional I/O port pin PORT1[7]; no alternate function is listed for this pin in the LQFP44 table."
},
{
"number": "4",
"name": "RST",
"type": "input",
"description": "Reset pin: holding it high for at least 24 clock cycles plus 10 µs puts the MCU into reset, and it starts from 0000H when pulled back low."
},
{
"number": "5",
"name": "P3.0/RxD",
"type": "bidirectional",
"description": "Standard I/O port pin PORT3[0]; serves as RxD, the serial port 1 data receive input."
},
{
"number": "6",
"name": "P4.3/INT2",
"type": "bidirectional",
"description": "Standard I/O port pin PORT4[3]; serves as external interrupt 2 input (falling-edge or low-level triggered)."
},
{
"number": "7",
"name": "P3.1/TxD",
"type": "bidirectional",
"description": "Standard I/O port pin PORT3[1]; serves as TxD, the serial port 1 data transmit output."
},
{
"number": "8",
"name": "P3.2/INT0",
"type": "bidirectional",
"description": "Standard I/O port pin PORT3[2]; serves as external interrupt 0 input, falling-edge or low-level triggered."
},
{
"number": "9",
"name": "P3.3/INT1",
"type": "bidirectional",
"description": "Standard I/O port pin PORT3[3]; serves as external interrupt 1 input, falling-edge or low-level triggered."
},
{
"number": "10",
"name": "P3.4/T0",
"type": "bidirectional",
"description": "Standard I/O port pin PORT3[4]; serves as external count input to Timer/Counter 0."
},
{
"number": "11",
"name": "P3.5/T1",
"type": "bidirectional",
"description": "Standard I/O port pin PORT3[5]; serves as external count input to Timer/Counter 1."
},
{
"number": "12",
"name": "P3.6/WR",
"type": "bidirectional",
"description": "Standard I/O port pin PORT3[6]; serves as WR, the external data memory write strobe."
},
{
"number": "13",
"name": "P3.7/RD",
"type": "bidirectional",
"description": "Standard I/O port pin PORT3[7]; serves as RD, the external data memory read strobe."
},
{
"number": "14",
"name": "XTAL2",
"type": "output",
"description": "Output of the internal clock inverting amplifier for the external crystal; may be left floating when an external clock drives XTAL1."
},
{
"number": "15",
"name": "XTAL1",
"type": "input",
"description": "Input to the internal clock inverting amplifier for the external crystal; acts as the external clock input when an external clock source is used directly."
},
{
"number": "16",
"name": "Gnd",
"type": "power_in",
"description": "Power supply negative terminal (ground)."
},
{
"number": "17",
"name": "P4.0",
"type": "bidirectional",
"description": "Standard I/O port pin PORT4[0] (Port 4 is bit-addressable at SFR address E8H)."
},
{
"number": "18",
"name": "P2.0",
"type": "bidirectional",
"description": "Port 2 bit 0 with internal pull-up; I/O pin, or low-order high address bit A8 when external memory is used."
},
{
"number": "19",
"name": "P2.1",
"type": "bidirectional",
"description": "Port 2 bit 1 with internal pull-up; I/O pin, or address bit A9 when external memory is used."
},
{
"number": "20",
"name": "P2.2",
"type": "bidirectional",
"description": "Port 2 bit 2 with internal pull-up; I/O pin, or address bit A10 when external memory is used."
},
{
"number": "21",
"name": "P2.3",
"type": "bidirectional",
"description": "Port 2 bit 3 with internal pull-up; I/O pin, or address bit A11 when external memory is used."
},
{
"number": "22",
"name": "P2.4",
"type": "bidirectional",
"description": "Port 2 bit 4 with internal pull-up; I/O pin, or address bit A12 when external memory is used."
},
{
"number": "23",
"name": "P2.5",
"type": "bidirectional",
"description": "Port 2 bit 5 with internal pull-up; I/O pin, or address bit A13 when external memory is used."
},
{
"number": "24",
"name": "P2.6",
"type": "bidirectional",
"description": "Port 2 bit 6 with internal pull-up; I/O pin, or address bit A14 when external memory is used."
},
{
"number": "25",
"name": "P2.7",
"type": "bidirectional",
"description": "Port 2 bit 7 with internal pull-up; I/O pin, or high-order address bit A15 when external memory is used."
},
{
"number": "26",
"name": "P4.4/PSEN",
"type": "bidirectional",
"description": "Standard I/O port pin PORT4[4]; labelled PSEN on the pinout diagram, with no further function described in the pin table."
},
{
"number": "27",
"name": "P4.5/ALE",
"type": "bidirectional",
"description": "ALE address latch enable output by default; can be set to standard I/O P4.5 in the ISP programmer, and also serves as programming pulse input."
},
{
"number": "28",
"name": "P4.1",
"type": "bidirectional",
"description": "Standard I/O port pin PORT4[1]."
},
{
"number": "29",
"name": "P4.6/EA",
"type": "bidirectional",
"description": "Standard I/O port pin PORT4[6]; labelled EA on the pinout diagram, with no further function described in the pin table."
},
{
"number": "30",
"name": "P0.7",
"type": "bidirectional",
"description": "Port 0 bit 7, open-drain after power-on reset; needs an external 10K-4.7K pull-up when used as I/O, and is the multiplexed data/address bus line AD7 when used as bus."
},
{
"number": "31",
"name": "P0.6",
"type": "bidirectional",
"description": "Port 0 bit 6, open-drain after power-on reset; needs an external 10K-4.7K pull-up when used as I/O, and is the multiplexed bus line AD6 when used as bus."
},
{
"number": "32",
"name": "P0.5",
"type": "bidirectional",
"description": "Port 0 bit 5, open-drain after power-on reset; needs an external 10K-4.7K pull-up when used as I/O, and is the multiplexed bus line AD5 when used as bus."
},
{
"number": "33",
"name": "P0.4",
"type": "bidirectional",
"description": "Port 0 bit 4, open-drain after power-on reset; needs an external 10K-4.7K pull-up when used as I/O, and is the multiplexed bus line AD4 when used as bus."
},
{
"number": "34",
"name": "P0.3",
"type": "bidirectional",
"description": "Port 0 bit 3, open-drain after power-on reset; needs an external 10K-4.7K pull-up when used as I/O, and is the multiplexed bus line AD3 when used as bus."
},
{
"number": "35",
"name": "P0.2",
"type": "bidirectional",
"description": "Port 0 bit 2, open-drain after power-on reset; needs an external 10K-4.7K pull-up when used as I/O, and is the multiplexed bus line AD2 when used as bus."
},
{
"number": "36",
"name": "P0.1",
"type": "bidirectional",
"description": "Port 0 bit 1, open-drain after power-on reset; needs an external 10K-4.7K pull-up when used as I/O, and is the multiplexed bus line AD1 when used as bus."
},
{
"number": "37",
"name": "P0.0",
"type": "bidirectional",
"description": "Port 0 bit 0, open-drain after power-on reset; needs an external 10K-4.7K pull-up when used as I/O, and is the multiplexed bus line AD0 when used as bus."
},
{
"number": "38",
"name": "Vcc",
"type": "power_in",
"description": "Power supply positive terminal."
},
{
"number": "39",
"name": "P4.2/INT3",
"type": "bidirectional",
"description": "Standard I/O port pin PORT4[2]; serves as external interrupt 3 input, falling-edge or low-level triggered."
},
{
"number": "40",
"name": "P1.0/T2",
"type": "bidirectional",
"description": "Standard I/O port pin PORT1[0]; serves as external input to Timer/Counter 2."
},
{
"number": "41",
"name": "P1.1/T2EX",
"type": "bidirectional",
"description": "Standard I/O port pin PORT1[1]; serves as T2EX, the Timer/Counter 2 capture/reload trigger control input."
},
{
"number": "42",
"name": "P1.2",
"type": "bidirectional",
"description": "Standard I/O port pin PORT1[2]; no alternate function is listed for this pin in the LQFP44 table."
},
{
"number": "43",
"name": "P1.3",
"type": "bidirectional",
"description": "Standard I/O port pin PORT1[3]; no alternate function is listed for this pin in the LQFP44 table."
},
{
"number": "44",
"name": "P1.4",
"type": "bidirectional",
"description": "Standard I/O port pin PORT1[4]; no alternate function is listed for this pin in the LQFP44 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 page 2 LQFP44 drawing text is scrambled in extraction, so the pin-number mapping was taken from ; Pin 6 is labelled INT3 in the pin description text but INT2 in the pinout diagram and in the P4.3 ro; Pins 26 (P4.4/PSEN) and 29 (P4.6/EA) are listed as standard I/O in the pin table, while the pinout d",
"2/44 pins cited to the wrong page (name found elsewhere): ['14:XTAL2@p26', '15:XTAL1@p26']"
],
"pages_sent": 114,
"cost_usd": 1.0897,
"at": "2026-10-20T17:30:18"
},
"datasheet": {
"url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8586172911534792704",
"pages": 502,
"sha256": "1875b8d4226f5c42",
"source_tier": "lcsc"
},
"cad": "KiCad official (CC-BY-SA 4.0)",
"pins": {
"total": 44,
"described": 44,
"cites_pages": true,
"refuses_to_fabricate": true
}
},
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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": [
12.0,
12.0,
1.5
],
"zmin_mm": 0.0,
"centre_offset_mm": 0.0,
"footprint_binding": "identity",
"sha256": "81aae6270b5c742bed79a8a35e9adf7fbed97c42e341e6b25ab20c1783b93b5d",
"checked": "2026-10-20",
"checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
},
{
"file": "stc90c516ad-40i-lqfp44-etched.step",
"role": "eda",
"up": "Z",
"units": "mm",
"origin": "footprint origin = pad-pattern centre",
"seat": "z = 0",
"extents_mm": [
12.0,
12.0,
1.5
],
"zmin_mm": 0.0,
"centre_offset_mm": 0.0,
"footprint_binding": "identity",
"sha256": "98de5795333875bb579bd3e963dd6229b0d1931a4a2529595cdeb4a85f7eacf5",
"checked": "2026-10-20",
"checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
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}
}