NFC F91W
About the NFC F91W PCB
NFC F91W is an open source PCB design by MacroLens, published on GitHub under the MIT license. It is a 2-layer board measuring 15 × 3.1 mm, with 2 components from 2 distinct parts.
Other key parts include the 4308RV. By type, the board carries 1 IC and 1 module.
It belongs with the wearables and displays & leds designs in this gallery.
From the project
This is a mod for the Casio F91-W to include a 125kHz NFC chip, specifically the T5577. The goal of this was to create a working tag that would fit in the watch with no modification to the outer case and water resistance.
The PCB was designed in KiCad and calculations for the required inductance were made using the following reference (This can be generalized to other frequencies).
The PCB is difficult to manufacture and solder. Soldering these will require a stencil and hot air station for the small traces of the ATA5577. My success rate, soldering with a hot air station and stencil, is 75% having only soldered four tags.
Main components on the NFC F91W
NFC F91W bill of materials (BOM)
2 components, 2 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 4308RV | 4308RV | U1 |
| 1 | ATA5577CM2xxxC-DBQ | ATA5577CM2xxxC-DBQ | M1 |
NFC F91W design files
The KiCad project lives in the MacroLens/NFC_F91W repository on GitHub; these links point at the commit this page was built from.
NFC F91W: common questions
How big is the NFC F91W PCB?
The NFC F91W measures 15 × 3.1 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the NFC F91W?
2 components, from 2 distinct parts. The full bill of materials is listed on this page.
Where can I download the NFC F91W design files?
From the MacroLens/NFC_F91W repository on GitHub, which has the KiCad layout; the links under Design files point to each one.
Can I use the NFC F91W design in my own project?
Yes, under the terms of its MIT license, which MacroLens chose for the repository.
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