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→Interface
{{SPARKImage|Spark-Photon-Materiel-01.png|640px}}
{{SPARKImage|Spark-Photon-Materiel-01.png|640px}}
=== Interface Externe Coexistante ===
The Photon supports coexistence with Bluetooth and other external radios via the three gold pads on the top side of the PCB near pin A3. These pads are 0.035" square, spaced 0.049" apart. This spacing supports the possibility of tacking on a small 1.25mm - 1.27mm pitch 3-pin male header to make it somewhat easier to interface with.
{{SPARKImage|Spark-Photon-Materiel-02.png|640px}}
When two radios occupying the same frequency band are used in the same system, such as Wi-Fi and Bluetooth, a coexistence interface can be used to coordinate transmit activity, to ensure optimal performance by arbitrating conflicts between the two radios.
{| class="wikitable" border="1"
| align="center" style="background:#f0f0f0;"|'''Pad #'''
| align="center" style="background:#f0f0f0;"|'''PØ Pin Name'''
| align="center" style="background:#f0f0f0;"|'''PØ Pin #'''
| align="center" style="background:#f0f0f0;"|'''I/O'''
| align="center" style="background:#f0f0f0;"|'''Description'''
|-
| 1 ||BTCX_RF_ACTIVE ||9 ||I ||Signals Bluetooth is active
|-
| 2 ||BTCX_STATUS ||10 ||I ||Signals Bluetooth priority status and TX/RX direction
|-
| 3 ||BTCX_TXCONF ||11 ||O ||
|}
When these pads are programmed to be used as a Bluetooth coexistence interface, they're set as high impedance on power up and reset. Alternatively, they can be individually programmed to be used as GPIOs through software control. They can also be programmed to have an internal pull-up or pull-down resistor.
{{Spark-Photon-Materiel-TRAILER}}
{{Spark-Photon-Materiel-TRAILER}}