component
STC8051U-34K64-QFP44
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": [
"component",
"embedded processors & controllers",
"stc8051u-34k64-qfp44",
"factory-2.0.0",
"extractor-text"
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"dependencies": {},
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"component": {
"mpn": "STC8051U-34K64-QFP44",
"manufacturer": "STC Micro",
"package": "LQFP-44(10x10)",
"pin_count": 44,
"category": "Embedded Processors & Controllers",
"subcategory": "Microcontrollers (MCU/MPU/SOC)",
"datasheet": "https://datasheet.lcsc.com/datasheet/pdf/e94c9d4cfcb6ea1d4b68ed05da5194ea.pdf",
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"lbr": "stc8051u-34k64-qfp44.lbr"
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"distributor_links": {
"lcsc": "C24833776"
},
"distributor_check": {
"checked_at": "2026-10-27T01:26:10Z",
"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": "General-purpose I/O P1.5 with quasi-bidirectional, push-pull, high-impedance or open-drain mode selectable, also usable as ADC5, MOSI, SCL_2 or PWM7_2."
},
{
"number": "2",
"name": "P1.6",
"type": "bidirectional",
"description": "General-purpose I/O P1.6 with selectable port mode, also usable as ADC6, MISO, RxD_3 or QSPIIO1."
},
{
"number": "3",
"name": "P1.7",
"type": "bidirectional",
"description": "General-purpose I/O P1.7 with selectable port mode, also usable as ADC7, SCLK, TxD_3 or QSPICLK."
},
{
"number": "4",
"name": "P4.7",
"type": "bidirectional",
"description": "General-purpose I/O P4.7, which can be configured as the RST reset input (active low) through RSTCFG P47RST; it carries a 10K pull-up that is enabled for about 6.5 ms after power-up when used as I/O."
},
{
"number": "5",
"name": "P3.0",
"type": "bidirectional",
"description": "General-purpose I/O P3.0 that also serves as the USB D- line, RxD and INT4; it is weak-pull-up/quasi-bidirectional after power-up."
},
{
"number": "6",
"name": "P4.3",
"type": "bidirectional",
"description": "General-purpose I/O P4.3 with selectable port mode, also usable as CCP1_2, SCLK_3 or TxD2_2."
},
{
"number": "7",
"name": "P3.1",
"type": "bidirectional",
"description": "General-purpose I/O P3.1 that also serves as the USB D+ line and TxD; it is weak-pull-up/quasi-bidirectional after power-up."
},
{
"number": "8",
"name": "P3.2",
"type": "bidirectional",
"description": "General-purpose I/O P3.2 that also serves as INT0 and SCL_4; during power-up it is pulled up to read USB-ISP entry state when P3.0 and P3.1 are both low."
},
{
"number": "9",
"name": "P3.3",
"type": "bidirectional",
"description": "General-purpose I/O P3.3 that also serves as INT1, SDA_4 or MISO_4."
},
{
"number": "10",
"name": "P3.4",
"type": "bidirectional",
"description": "General-purpose I/O P3.4 that also serves as T0 (timer 0 external input), T1CLKO or MOSI_4."
},
{
"number": "11",
"name": "P3.5",
"type": "bidirectional",
"description": "General-purpose I/O P3.5 that also serves as T1 (timer 1 external input), T0CLKO, PWMFLT or SS_4."
},
{
"number": "12",
"name": "P3.6",
"type": "bidirectional",
"description": "General-purpose I/O P3.6 that also serves as INT2, WR_2 or RxD_2."
},
{
"number": "13",
"name": "P3.7",
"type": "bidirectional",
"description": "General-purpose I/O P3.7 that also serves as INT3, RD_2 or TxD_2."
},
{
"number": "14",
"name": "P5.6",
"type": "bidirectional",
"description": "General-purpose I/O P5.6 that also serves as XTALO (crystal output) or the MCLKO clock output; it is a high-impedance input in external clock mode."
},
{
"number": "15",
"name": "P5.7",
"type": "bidirectional",
"description": "General-purpose I/O P5.7 that also serves as XTALI (crystal/external clock input)."
},
{
"number": "16",
"name": "Gnd",
"type": "power_in",
"description": "Ground, shared with ADC_AGnd and ADC_Vref-; the datasheet recommends a short, thick trace between system ground and ADC analog ground."
},
{
"number": "17",
"name": "P4.0",
"type": "bidirectional",
"description": "General-purpose I/O P4.0 with selectable port mode, also usable as SS_3, ADCETR_2 or QSPINCS_2."
},
{
"number": "18",
"name": "P2.0",
"type": "bidirectional",
"description": "General-purpose I/O P2.0 that also serves as address bit A8, T11, CCP0_3 or PWM1P_3."
},
{
"number": "19",
"name": "P2.1",
"type": "bidirectional",
"description": "General-purpose I/O P2.1 that also serves as address bit A9, T11CLKO, CCP1_3 or PWM1N_3."
},
{
"number": "20",
"name": "P2.2",
"type": "bidirectional",
"description": "General-purpose I/O P2.2 that also serves as address bit A10, CCP2_3 or PWM2P_3."
},
{
"number": "21",
"name": "P2.3",
"type": "bidirectional",
"description": "General-purpose I/O P2.3 that also serves as address bit A11, SDA, ECI_3 or PWM2N_3."
},
{
"number": "22",
"name": "P2.4",
"type": "bidirectional",
"description": "General-purpose I/O P2.4 that also serves as address bit A12, SS_2, SCL or PWM3P_3."
},
{
"number": "23",
"name": "P2.5",
"type": "bidirectional",
"description": "General-purpose I/O P2.5 that also serves as address bit A13, MOSI_2, PWM3N_3 or QSPIIO0_3."
},
{
"number": "24",
"name": "P2.6",
"type": "bidirectional",
"description": "General-purpose I/O P2.6 that also serves as address bit A14, MISO_2, PWM4P_3 or QSPIIO1_3."
},
{
"number": "25",
"name": "P2.7",
"type": "bidirectional",
"description": "General-purpose I/O P2.7 that also serves as address bit A15, SCLK_2, PWM4N_3 or QSPICLK_3."
},
{
"number": "26",
"name": "UCAP",
"type": "passive",
"description": "Internal regulator filter capacitor pin (shown as UCAP, also multiplexed with P4.4/RD/TxD_4/CCP2_2/PWMAPS5_2); it must be connected to an external capacitor as shown in the datasheet reference circuits."
},
{
"number": "27",
"name": "P4.5",
"type": "bidirectional",
"description": "General-purpose I/O P4.5 that also serves as ALE, CMPO or QSPIIO3_3."
},
{
"number": "28",
"name": "P4.1",
"type": "bidirectional",
"description": "General-purpose I/O P4.1 that also serves as CMPO_2, ECI_2, MOSI_3 or QSPIIO0_2."
},
{
"number": "29",
"name": "P4.6",
"type": "bidirectional",
"description": "General-purpose I/O P4.6 that also serves as the CMP+ comparator input or QSPIIO2_3."
},
{
"number": "30",
"name": "P0.7",
"type": "bidirectional",
"description": "General-purpose I/O P0.7 that also serves as AD7, T4CLKO, CMP+_2, PWM8 or PWMFLT_3."
},
{
"number": "31",
"name": "P0.6",
"type": "bidirectional",
"description": "General-purpose I/O P0.6 that also serves as ADC14, AD6, T4, CMP+_3 or PWM4P_2."
},
{
"number": "32",
"name": "P0.5",
"type": "bidirectional",
"description": "General-purpose I/O P0.5 that also serves as ADC13, AD5, T3CLKO, CMP- or PWM3N_2."
},
{
"number": "33",
"name": "P0.4",
"type": "bidirectional",
"description": "General-purpose I/O P0.4 that also serves as ADC12, AD4, T3 or PWM3P_2."
},
{
"number": "34",
"name": "P0.3",
"type": "bidirectional",
"description": "General-purpose I/O P0.3 that also serves as ADC11, AD3, TxD4, PWM2N_2 or PWM6."
},
{
"number": "35",
"name": "P0.2",
"type": "bidirectional",
"description": "General-purpose I/O P0.2 that also serves as ADC10, AD2, RxD4 or PWM2P_2."
},
{
"number": "36",
"name": "P0.1",
"type": "bidirectional",
"description": "General-purpose I/O P0.1 that also serves as ADC9, AD1, TxD3, PWM1N_2 or PWM5."
},
{
"number": "37",
"name": "P0.0",
"type": "bidirectional",
"description": "General-purpose I/O P0.0 that also serves as ADC8, AD0, RxD3 or PWM1P_2."
},
{
"number": "38",
"name": "Vcc",
"type": "power_in",
"description": "Supply pin shared with AVcc and ADC_VRef+; the datasheet specifies a 1.9V to 5.5V operating range."
},
{
"number": "39",
"name": "P4.2",
"type": "bidirectional",
"description": "General-purpose I/O P4.2 that also serves as WR, RxD2_2, CCP0_2, MISO_3 or QSPIIO1_2."
},
{
"number": "40",
"name": "P1.0",
"type": "bidirectional",
"description": "General-purpose I/O P1.0 that also serves as ADC0, T2, PWM1P or ADC input for the comparator."
},
{
"number": "41",
"name": "P1.1",
"type": "bidirectional",
"description": "General-purpose I/O P1.1 that also serves as ADC1, CCP2, T2CLKO or PWM1N."
},
{
"number": "42",
"name": "P1.2",
"type": "bidirectional",
"description": "General-purpose I/O P1.2 that also serves as ADC2, RxD2, ECI, PWM2P or QSPIIO3."
},
{
"number": "43",
"name": "P1.3",
"type": "bidirectional",
"description": "General-purpose I/O P1.3 that also serves as ADC3, TxD2, CCP0, PWM2N or QSPIIO2."
},
{
"number": "44",
"name": "P1.4",
"type": "bidirectional",
"description": "General-purpose I/O P1.4 that also serves as ADC4, SS, SDA_2, CCP1, PWM3P or QSPINCS."
}
],
"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 hint says LQFP-44(10x10), but the datasheet's LQFP44/QFP44 outline is 12mm x 12mm (section 4.11,"
],
"pages_sent": 201,
"cost_usd": 0.2406,
"at": "2026-10-27T01:25:32"
},
"datasheet": {
"url": "https://datasheet.lcsc.com/datasheet/pdf/e94c9d4cfcb6ea1d4b68ed05da5194ea.pdf",
"pages": 1195,
"sha256": "a6715a28b4455f2b",
"source_tier": "lcsc"
},
"cad": "KiCad official (CC-BY-SA 4.0)",
"pins": {
"total": 44,
"described": 44,
"cites_pages": true,
"refuses_to_fabricate": true
}
},
"viewers": {
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"footprint": "viewers/footprint.html"
},
"models_3d": [
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"units": "mm",
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"seat": "z = 0",
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"zmin_mm": 0.0,
"centre_offset_mm": 0.0,
"footprint_binding": "identity",
"sha256": "81aae6270b5c742bed79a8a35e9adf7fbed97c42e341e6b25ab20c1783b93b5d",
"checked": "2026-10-27",
"checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
},
{
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"sha256": "abdfa8b62211b2820838d533ceaea35241fbaeb024d5010dc19eab92054b7364",
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}