# ELECHOUSE ST25R3916B: SPI wiring

Signal connections for the seven-pin module in the V0.3 Draft datasheet.

**Applies to:** V0.3 Draft, 2026-07-18; not the Mini module or the chip package. Confirm connector orientation against the original board drawing.

## When to use it

Using this exact ELECHOUSE module in its documented default SPI mode.

## Why it works this way

IRQ is additional to the four SPI signals.

![ELECHOUSE ST25R3916B: SPI wiring — V0.3 Draft, 2026-07-18; not the Mini module or the chip package. Confirm connector orientation against the original board drawing.](https://valleytech-black-wire-guide.pages.dev/library/wiring/st25r3916b-spi.svg)

[Open / save the original SVG](https://valleytech-black-wire-guide.pages.dev/library/wiring/st25r3916b-spi.svg)

## Connection reference

| Contact | SPI signal | Host connection |
| --- | --- | --- |
| 1 | IRQ | Interrupt input |
| 2 | CS / BSS | Chip-select output |
| 3 | SCLK | SPI clock |
| 4 | MOSI | MOSI |
| 5 | MISO | MISO |
| 6 | 5V | Module supply |
| 7 | GND | Ground |

## Make the connection

1. Match the seven-pin board and default SPI configuration.
2. Use the module's supported library and its documented startup sequence.

## Check before powering

- The 5V label does not make the signals 5 V tolerant.

## Matching module references

- [ST25R3916B NFC Module](https://valleytech-black-wire-guide.pages.dev/?tab=makers&part=elechouse-st25r3916b) — original images and datasheets

## Sources & review

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

- [ELECHOUSE ST25R3916B module, V0.3 Draft](https://www.elechouse.com/wp-content/uploads/2026/07/ST25R3916B_NFC_Module_Datasheet.pdf) — Page 4: seven-pin connector, power and SPI/I2C mode selection; checked 2026-09-27
- [Analog Devices: Introduction to SPI Interface](https://www.analog.com/en/resources/analog-dialogue/articles/introduction-to-spi-interface.html) — Interface, signal direction and CPOL/CPHA table; 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](https://creativecommons.org/licenses/by/4.0/) · SHA-256: `cfdf9798defa8349fd3273fe605d6596ba57d4a2bbf48b11f1c6eb9828031bbd`

[Open the interactive guide](https://valleytech-black-wire-guide.pages.dev/?tab=wiring&guide=st25r3916b-spi) · [All wiring guides](Wiring.md)