• MPN: RV-3028-C8-32.768KHZ-1PPM-TA-QC
• Manufacturer: Micro Crystal AG
• Part type: Crystals and Oscillators / integrated real-time-clock module
• Pin count: 8
• Package: C8, 2.0 × 1.2 × 0.6 mm, 8-pad SMD ceramic package
• Existing description: 0.92/10.2024 Manufacturer Recommendations 0.6mm Micro Crystal AG
• Datasheet status before review: blank
• Datasheet property now resolves to the official Micro Crystal PDF: https://www.microcrystal.com/fileadmin/Media/Products/RTC/Datasheet/RV-3028-C8.pdf
• Additional metadata added: Manufacturer Name and Package or Case Code.

• Supply range: 1.1–5.5 V for timekeeping; 1.2–5.5 V while I²C is active.
• Timekeeping current: 70 nA typical, 90 nA maximum at 3 V with I²C inactive.
• Factory accuracy option: ±1 ppm at 25 °C.
• Operating temperature: −40 to +85 °C.
• Interface: I²C, up to 400 kHz.
• Programmable CLKOUT: 32.768 kHz, 8192 Hz, 1024 Hz, 64 Hz, 32 Hz, or 1 Hz.
• Functions: automatic backup switchover, trickle charger, alarm, timer, timestamp/event input, UNIX counter, 43 bytes nonvolatile user memory, and 2 bytes RAM.
• Package processing: Pb-free/RoHS; reflow profile lists 260 °C for 20–40 seconds.
• Metal lid is electrically connected to VSS (pin 5).

Evidence note: the project initially had no indexed datasheet. The electrical and pin data were extracted from a mirrored copy and cross-checked against Micro Crystal's official product page; after the property update, the library resolved the Datasheet URL to Micro Crystal's official PDF.

• All eight pin numbers and names match the datasheet.
• Pin directions are consistent with the documented functions.
• The symbol places inputs on the left and outputs/power pins on the right; this is readable and does not affect electrical correctness.
• Metadata gap: none of the terminals has a populated Pin Description property. The terminal names are correct, but descriptive text such as “Serial clock input” or “Backup supply voltage” is absent.
• ~INT correctly conveys an active-low signal visually, though the manufacturer pin name is normally rendered INT with an overbar.

• Eight rectangular SMD pads.
• Pad numbering maps correctly to the symbol terminals.
• Body fabrication outline: 1.2 × 2.0 mm.
• Pad dimensions: 0.70 × 0.27 mm.
• Pad row centers: x = ±0.50 mm.
• Pad y positions: ±0.81 mm and ±0.27 mm, giving 0.54 mm pitch.
• Pin-1 indicator is adjacent to pad 1.
• Courtyard: 2.2 × 2.5 mm.
• A STEP model is attached.

1. Datasheet was missing — corrected by setting the official manufacturer product/document URL.
2. Manufacturer Name was blank — corrected to Micro Crystal AG.
3. Package metadata was absent — corrected with the C8 package description.
4. Pin descriptions are missing — names and electrical types are correct, but terminal descriptions should be populated for library quality and searchability.
5. Part classification is broad — Crystals and Oscillators is not wrong, but Real-Time Clock / RTC module would be a more precise subtype if the property taxonomy supports it.
6. Description is not user-facing — the current description looks like source/revision notes rather than a functional description. A clearer description would be: “Ultra-low-power I²C real-time clock module with integrated 32.768 kHz crystal, backup switchover, trickle charger, timestamp, alarm, timer, and ±1 ppm option.”
7. Mount metadata is incorrect — the library index reports Mount: Wire, while this is an 8-pad surface-mount ceramic package. It should be SMD.
8. Manufacturer facet normalization is incomplete — the explicit Manufacturer Name is now correct, but the library search facet still categorizes the manufacturer as Other.