component
BQ4802LYDW
Public Made by Adomby adom
Texas Instruments Real Time Clocks, SOIC-28-300mil. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
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{
"schema_version": 1,
"type": "component",
"slug": "bq4802lydw",
"title": "BQ4802LYDW",
"brief": "Texas Instruments Real Time Clocks, SOIC-28-300mil. 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",
"clock-timing",
"bq4802lydw",
"factory-2.0.0",
"extractor-text"
],
"component": {
"mpn": "BQ4802LYDW",
"manufacturer": "Texas Instruments",
"package": "SOIC-28-300mil",
"pin_count": 28,
"category": "Clock/Timing",
"subcategory": "Real Time Clocks",
"datasheet": "https://www.ti.com/cn/lit/gpn/bq4802ly",
"parts": {
"symbol": "bq4802lydw.kicad_sym",
"footprint": "bq4802lydw.kicad_mod",
"model_3d": "bq4802lydw-hero.glb",
"model_3d_plain": "bq4802lydw.glb",
"model_3d_step": "bq4802lydw-etched.step",
"model_3d_step_plain": "bq4802lydw.step",
"lbr": "bq4802lydw.lbr"
},
"distributor_links": {
"lcsc": "C1542366",
"digikey": "2156-BQ4802LYDW-ND",
"mouser": "595-BQ4802LYDW"
},
"distributor_check": {
"checked_at": "2026-10-08T19:58:58Z",
"source": "Component Ocean /api/assign-pns",
"digikey": {
"pn": "2156-BQ4802LYDW-ND",
"status": "found",
"lifecycle": "Last Time Buy"
},
"mouser": {
"pn": "595-BQ4802LYDW",
"status": "found",
"lifecycle": "End of Life"
}
},
"pins": [
{
"number": "1",
"name": "VOUT",
"type": "power_out",
"description": "Provides the higher of VCC or VBC, switched internally, to supply external RAM."
},
{
"number": "2",
"name": "X1",
"type": "passive",
"description": "Crystal connection for the 32.768-kHz quartz crystal."
},
{
"number": "3",
"name": "X2",
"type": "passive",
"description": "Crystal connection for the 32.768-kHz quartz crystal."
},
{
"number": "4",
"name": "WDO",
"type": "output",
"description": "Goes low if WDI remains high or low longer than the watchdog time-out period, returns high on the next WDI transition, and remains high if WDI is unconnected."
},
{
"number": "5",
"name": "INT",
"type": "output",
"description": "Goes low when a power-fail, periodic, or alarm condition occurs; INT is an open-drain output."
},
{
"number": "6",
"name": "RST",
"type": "bidirectional",
"description": "Goes low when VCC falls below the power-fail threshold and stays low for 200 ms (typical) after VCC crosses the threshold on power-up; also accepts a push-button override and re-enters the reset cycle when released from being pulled low for more than 1 µs."
},
{
"number": "7",
"name": "A3",
"type": "input",
"description": "Address input that, together with A0-A2, allows access to the 16 bytes of real-time clock and control registers."
},
{
"number": "8",
"name": "A2",
"type": "input",
"description": "Address input that, together with A0, A1 and A3, allows access to the 16 bytes of real-time clock and control registers."
},
{
"number": "9",
"name": "A1",
"type": "input",
"description": "Address input that, together with A0, A2 and A3, allows access to the 16 bytes of real-time clock and control registers."
},
{
"number": "10",
"name": "A0",
"type": "input",
"description": "Address input that, together with A1-A3, allows access to the 16 bytes of real-time clock and control registers."
},
{
"number": "11",
"name": "DQ0",
"type": "bidirectional",
"description": "x8 data bus bit 0 for real-time clock information, connected to the memory data bus."
},
{
"number": "12",
"name": "DQ1",
"type": "bidirectional",
"description": "x8 data bus bit 1 for real-time clock information, connected to the memory data bus."
},
{
"number": "13",
"name": "DQ2",
"type": "bidirectional",
"description": "x8 data bus bit 2 for real-time clock information, connected to the memory data bus."
},
{
"number": "14",
"name": "VSS",
"type": "power_in",
"description": "Ground reference for the device."
},
{
"number": "15",
"name": "DQ3",
"type": "bidirectional",
"description": "x8 data bus bit 3 for real-time clock information, connected to the memory data bus."
},
{
"number": "16",
"name": "DQ4",
"type": "bidirectional",
"description": "x8 data bus bit 4 for real-time clock information, connected to the memory data bus."
},
{
"number": "17",
"name": "DQ5",
"type": "bidirectional",
"description": "x8 data bus bit 5 for real-time clock information, connected to the memory data bus."
},
{
"number": "18",
"name": "DQ6",
"type": "bidirectional",
"description": "x8 data bus bit 6 for real-time clock information, connected to the memory data bus."
},
{
"number": "19",
"name": "DQ7",
"type": "bidirectional",
"description": "x8 data bus bit 7 for real-time clock information, connected to the memory data bus."
},
{
"number": "20",
"name": "VSS",
"type": "power_in",
"description": "Ground reference for the device (second VSS pin; leave unconnected only in the SNAPHAT DSH package)."
},
{
"number": "21",
"name": "CS",
"type": "input",
"description": "Chip-select input for the device."
},
{
"number": "22",
"name": "OE",
"type": "input",
"description": "Provides the read control for the real-time clock memory locations."
},
{
"number": "23",
"name": "WDI",
"type": "input",
"description": "Three-level watchdog input; if held high or low longer than the 1.5-s default time-out, WDO goes low, and leaving it unconnected disables the watchdog (sets mid-supply internally)."
},
{
"number": "24",
"name": "BC",
"type": "power_in",
"description": "Connect to a 3-V backup cell; a voltage within the VBC range must be present at power-up for proper oscillator start-up."
},
{
"number": "25",
"name": "CEOUT",
"type": "output",
"description": "Goes low only when CEIN is low and VCC is above the power-fail threshold; if power fails while CEIN is low, it stays low for 100 µs or until CEIN goes high, whichever occurs first."
},
{
"number": "26",
"name": "CEIN",
"type": "input",
"description": "Input to the chip-enable gating circuit that controls CEOUT."
},
{
"number": "27",
"name": "WE",
"type": "input",
"description": "Provides the write control for the real-time clock memory locations."
},
{
"number": "28",
"name": "VCC",
"type": "power_in",
"description": "5-V or 3.3-V supply input; the bq4802LY is specified for 2.7 V to 3.6 V in recommended operating conditions."
}
],
"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 datasheet pin table lists DQ0–DQ7 as type 'I' (input), but they carry data both into and out of ; Pin numbers and names were reconstructed from the page 5 pin-assignment layout (the text extraction ; The datasheet pin text gives '5-V or 3.3-V input' for VCC; the 2.7–3.6 V limit is from the recommend"
],
"pages_sent": 10,
"cost_usd": 0.0771,
"at": "2026-10-08T19:58:34"
},
"datasheet": {
"url": "https://www.ti.com/cn/lit/gpn/bq4802ly",
"pages": 25,
"sha256": "56b33867dd7e9d2c",
"source_tier": "lcsc"
},
"cad": "KiCad official (CC-BY-SA 4.0)",
"pins": {
"total": 28,
"described": 28,
"cites_pages": true,
"refuses_to_fabricate": true
}
},
"viewers": {
"symbol": "viewers/symbol.html",
"footprint": "viewers/footprint.html"
},
"models_3d": [
{
"file": "bq4802lydw.step",
"role": "plain",
"up": "Z",
"units": "mm",
"origin": "footprint origin = pad-pattern centre",
"seat": "z = 0",
"extents_mm": [
10.3,
17.9,
2.75
],
"zmin_mm": 0,
"centre_offset_mm": 0,
"footprint_binding": "identity",
"sha256": "b889a13dbe9ec59e79fa9f1b5118b00bfa54f9582392335ff3365b64afc264b1",
"checked": "2026-10-08",
"checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
},
{
"file": "bq4802lydw-etched.step",
"role": "eda",
"up": "Z",
"units": "mm",
"origin": "footprint origin = pad-pattern centre",
"seat": "z = 0",
"extents_mm": [
10.3,
17.9,
2.75
],
"zmin_mm": 0,
"centre_offset_mm": 0,
"footprint_binding": "identity",
"sha256": "4740a4f5804b3b456501bba63aa681e8e477ce75a68bf4eb756244e11c2d25f1",
"checked": "2026-10-08",
"checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
}
]
},
"metadata": {
"specs": {
"Manufacturer": "Texas Instruments",
"Package": "SOIC-28-300mil",
"Category": "Clock/Timing",
"Pins": "28"
}
},
"variants": [],
"sections": [
"hero",
"viewers",
"readme",
"breadcrumbs",
"info"
],
"discovery_triggers": [
"bq4802lydw"
],
"discovery_pitch": "BQ4802LYDW (Texas Instruments) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
"author": {
"name": "Ray",
"email": "[email protected]"
},
"dependencies": {},
"hero": {
"type": "image",
"path": "docs/hero.png"
},
"files": [
"page.json",
"README.md",
"bq4802lydw.kicad_sym",
"bq4802lydw.kicad_mod",
"bq4802lydw.glb",
"bq4802lydw.step",
"bq4802lydw.lbr",
"docs/hero.png",
"docs/bq4802lydw-datasheet.pdf",
"viewers/symbol.html",
"viewers/footprint.html",
"bq4802lydw-hero.glb",
"bq4802lydw-hero.overlay.json"
],
"visibility": {
"public": true
}
}