2 layers18.5 × 26 mm
24g2usb rp2350zero
joypad-ai/joypad-os
Universal controller firmware for building adapters, dongles, and custom controllers.
4 parts1.7kApache-2.0
2 layers18.3 × 31.1 mm
Nw12887
necroware/nw1288754Drop-In replacement for Dallas DS12887 RTC module
- Size
- 18.3 × 31.1 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 4
- Nets
- 21
- Pads
- 55
- Tracks, vias
- 103, 20
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 4 Jun 2021
- Updated
- 21 Dec 2021
Overview
Nw12887 is an open-source printed circuit board by necroware, from the necroware/nw12887 repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 18.3 × 31.1 mm with 4 parts on 21 nets, routed with 103 tracks and 20 vias.
It is built around the DS12887A+. Its parts include 2 ICs and 1 crystal.
Main components
1README
README.mdNecroware's NW12887 RTC module
ATTENTION: this project was made for the SSOP-24 version of the RTC IC, if you need the SO-24 version go for https://github.com/necroware/nwX287 project instead
This is a drop-in replacement for RTC modules with solid body. Such modules were widely used on 486 and Pentium mainboards back in the days. After so many years the battery inside of such modules got empty and there is no way to exchange it. With empty battery BIOS settings can not be saved and so many mainboards can't even boot properly. This alternative solution has a socket for CR1225 and the battery can be easily replaced again, when it gets empty.
This part should be compatible with following RTC modules:
- Dallas DS1287 / DS12887 / DS12B887
- Benchmarq BQ3287
- ODIN OEC12C887
Bill of Materials
| Part | # | Description |
|---|---|---|
| U1 | 1 | Real-Time Clock BQ3285LDSS SSOP-24 |
| Y1 | 1 | Crystal oscillator 32.768kHz 6pF |
| BT1 | 1 | CR1220 / CR1225 SMD battery holder |
Parts
4Questions
How big is the Nw12887 PCB?
It measures 18.3 × 31.1 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Nw12887 use?
4 parts, built around the DS12887A+. 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.
Where can I download the Nw12887 KiCad files?
From the necroware/nw12887 repository on GitHub, at the commit this page was made from: the board is kicad/nw12887.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Nw12887 design in my own project?
Its repository publishes it under the GPL-3.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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