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zynthian/zynthian-hw
Zynthian hardware stuff: PCBs, schemes, parts specifications, pin assignment, ...

RTC RV-3028-C7 Brekaout Board
RTC RV-3028-C7-breakout is an open-source printed circuit board by jedp, from the jedp/RTC-RV-3028-C7-breakout repository on GitHub, published under the MIT licence. It is a 2-layer board of 18.8 × 22.5 mm with 13 parts on 9 nets, routed with 80 tracks and 6 vias.
It is built around the RV-3028-C7. Its parts include 6 resistors, 2 capacitors, 2 connectors and 1 IC. It belongs with the interfaces and adapters boards of this library.
If you're using an Arduino, this goes nicely with Constantin Koch's RV-3038-C7-Arduino_Library, which you can download direcly from the Arduino Library Manager.
Dimensions: 18.8mm x 22.6mm.

| Qty | Value | Footprint | References |
|---|---|---|---|
| 5 | 10k | Resistor_SMD:R_0603_1608Metric | R1, R2, R4, R5, R6 |
| 2 | 0.1µ | Capacitor_SMD:C_0603_1608Metric | C1, C2 |
| 2 | Conn_01x04_Female | Connector_PinSocket_2.54mm:PinSocket_1x04_P2.54mm_Vertical | J1, J2 |
| 1 | 1k | Resistor_SMD:R_0603_1608Metric | R3 |
| 1 | LOGO | LOGO | G*** |
| 1 | MS621F | Battery:BatteryHolder_Seiko_MS621F | BT1 |
| 1 | RV-3028-C7 | RTC_Footprints:RV-3028-C7 | U1 |

zynthian/zynthian-hw
Zynthian hardware stuff: PCBs, schemes, parts specifications, pin assignment, ...

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Ghost3379/NX-ISD
A more sophisticated version of the Artemis Watch by Circuitmess.
It measures 18.8 × 22.5 mm and has 2 copper layers, 1.6 mm thick.
13 parts, built around the RV-3028-C7. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
From the jedp/RTC-RV-3028-C7-breakout repository on GitHub, at the commit this page was made from: the board is RTC-RV-3028-C7-breakout/RTC-RV-3028-C7-breakout.kicad_pcb and its schematic RTC-RV-3028-C7-breakout/RTC-RV-3028-C7-breakout.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).