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.
← Commit history
README.mdadded+64@@ -0,0 +1,64 @@+# BQ4802LYDW++**Texas Instruments** · Real Time Clocks · SOIC-28-300mil++BQ4802LYDW from Texas Instruments, in a SOIC-28-300mil. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | VOUT | power_out | Provides the higher of VCC or VBC, switched internally, to supply external RAM. |+| 2 | X1 | passive | Crystal connection for the 32.768-kHz quartz crystal. |+| 3 | X2 | passive | Crystal connection for the 32.768-kHz quartz crystal. |+| 4 | WDO | output | 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. |+| 5 | INT | output | Goes low when a power-fail, periodic, or alarm condition occurs; INT is an open-drain output. |+| 6 | RST | bidirectional | 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. |+| 7 | A3 | input | Address input that, together with A0-A2, allows access to the 16 bytes of real-time clock and control registers. |+| 8 | A2 | input | Address input that, together with A0, A1 and A3, allows access to the 16 bytes of real-time clock and control registers. |+| 9 | A1 | input | Address input that, together with A0, A2 and A3, allows access to the 16 bytes of real-time clock and control registers. |+| 10 | A0 | input | Address input that, together with A1-A3, allows access to the 16 bytes of real-time clock and control registers. |+| 11 | DQ0 | bidirectional | x8 data bus bit 0 for real-time clock information, connected to the memory data bus. |+| 12 | DQ1 | bidirectional | x8 data bus bit 1 for real-time clock information, connected to the memory data bus. |+| 13 | DQ2 | bidirectional | x8 data bus bit 2 for real-time clock information, connected to the memory data bus. |+| 14 | VSS | power_in | Ground reference for the device. |+| 15 | DQ3 | bidirectional | x8 data bus bit 3 for real-time clock information, connected to the memory data bus. |+| 16 | DQ4 | bidirectional | x8 data bus bit 4 for real-time clock information, connected to the memory data bus. |+| 17 | DQ5 | bidirectional | x8 data bus bit 5 for real-time clock information, connected to the memory data bus. |+| 18 | DQ6 | bidirectional | x8 data bus bit 6 for real-time clock information, connected to the memory data bus. |+| 19 | DQ7 | bidirectional | x8 data bus bit 7 for real-time clock information, connected to the memory data bus. |+| 20 | VSS | power_in | Ground reference for the device (second VSS pin; leave unconnected only in the SNAPHAT DSH package). |+| 21 | CS | input | Chip-select input for the device. |+| 22 | OE | input | Provides the read control for the real-time clock memory locations. |+| 23 | WDI | input | 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). |+| 24 | BC | power_in | Connect to a 3-V backup cell; a voltage within the VBC range must be present at power-up for proper oscillator start-up. |+| 25 | CEOUT | output | 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. |+| 26 | CEIN | input | Input to the chip-enable gating circuit that controls CEOUT. |+| 27 | WE | input | Provides the write control for the real-time clock memory locations. |+| 28 | VCC | power_in | 5-V or 3.3-V supply input; the bq4802LY is specified for 2.7 V to 3.6 V in recommended operating conditions. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Texas Instruments |+| Package | SOIC-28-300mil |+| Category | Clock/Timing |+| Pins | 28 |++## CAD (KiCad official)++- Symbol: `BQ4802LYDW`+- Footprint: `Package_SO:SOIC-28W_7.5x17.9mm_P1.27mm`+- 3D model: SOIC-28-300mil (KiCad packages3D, STEP)+- 3D model files: `bq4802lydw-etched.step` / `bq4802lydw-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bq4802lydw.step` / `bq4802lydw.glb` are the bare package body.++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/cn/lit/gpn/bq4802ly) (25 pp, sha256 `56b33867dd7e9d2c`, retrieved 2026-10-08, tier: lcsc)+- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.+- **CAD:** KiCad official libraries (CC-BY-SA 4.0).++[Datasheet PDF](docs/bq4802lydw-datasheet.pdf)
page.jsonadded+321@@ -0,0 +1,321 @@+{+ "slug": "bq4802lydw",+ "version": "0.1.0",+ "type": "component",+ "description": "Texas Instruments Real Time Clocks, SOIC-28-300mil. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",+ "tags": [+ "component",+ "clock-timing",+ "bq4802lydw",+ "factory-2.0.0",+ "extractor-text"+ ],+ "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"+ ],+ "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)"+ }+ ]+ },+ "visibility": "public",+ "org": "adom",+ "author": {+ "name": "Ray",+ "email": "[email protected]"+ }+}