wiring pn532 v3 modes

ELECHOUSE PN532 V3: choose the host mode

Select UART, I2C or SPI before following that interface's wiring diagram.

Applies to: V3 manual revision B, 2013-11-05. Switch settings are not transferable to V4, MINI, USB or unbranded boards.

When to use it

Identifying a documented ELECHOUSE V3 module for an NFC prototype.

Why it works this way

The same header labels can have different roles in different modes.

Open / save the original SVG

Connection reference

Host mode	Switch 1	Switch 2
HSU / UART	OFF	OFF
I2C	ON	OFF
SPI	OFF	ON

Make the connection

1. Identify the V3 board and numbered switches from the original reference.
2. Choose one interface, power-cycle after changing it, and use the corresponding library configuration.
3. Follow the exact header map and verify supply and I/O levels separately.

Check before powering

• This guide does not approve the legacy manual's broad voltage-tolerance wording for every pin.
• NFC radio/card mode is separate from the UART/I2C/SPI host mode.

Matching module references

• PN532 NFC RFID module V3 — original images and datasheets

Sources & review

Source documents inspected; independent electrical and bench review pending. Reviewed 2026-09-27.

• ELECHOUSE PN532 V3 user manual, revision B — Pages 3-5: interface switches and headers; not valid for other PN532 boards; checked 2026-09-27
• NXP: PN532/C1 datasheet — Host interfaces and supported operating modes; checked 2026-09-27

Original writing and diagram by Kal / Valleytech Solutions, CC BY 4.0. Manufacturer artwork and documentation retain their own rights.

CC BY 4.0 · SHA-256: 39f47978d840c0ee28319db3d0e35ee1ee9d9997b3b1df22eced94798e127ff4

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