Loading source-backed pinouts…
Board overview
Particle Photon 2
Particle · Photon
Pin search cleared
Filter pins
Showing 27 of 27 pins
Simplified diagram, grouped by function — not to physical scale. Pin data is source-backed; verify against the linked documentation.
Hover, tap, or focus a pad to inspect a pin. Use arrow keys to move between pins.
Mapped source · Particle Photon 2 datasheetOfficial- Feather-form-factor Particle board on a Realtek RTL8721DM (Cortex-M33); functions from the official Particle datasheet.
- GPIO and ALL ports (I2C, SPI, UART) are 3.3 V and are NOT 5 V tolerant.
- D6 (SWCLK) has a 40K pull-down and D7 (SWDIO, blue LED) a 40K pull-up at boot; holding D7 low at boot enters MCU test mode. TX/D8 low at boot triggers ISP flash.
- ADC inputs are 12-bit 0-3.3 V; A6 (VBAT_MEAS) reads battery 0-5 V scaled to 0-4095.
All 27 pins
| # | Signal | Role | Net | Also / notes |
|---|---|---|---|---|
| Power | ||||
| 1 | Power | LI+ | LiPo battery 3.6-4.2 V | |
| 2 | Power | VUSB | 5 V USB (1 A max) | |
| 3 | Power | 3V3 | 3.3 V regulator out (500 mA) | |
| 4 | Ground | GND | ||
| 5 | System | pull low to power down | ||
| 6 | System | |||
| 7 | System | PA4 · mode button, internal pull-up | ||
| Analog / I2C | ||||
| 8 | ADC | PB1 · ADC4; PDM CLK | ||
| 9 | ADC | PB2 · ADC5; PDM DAT | ||
| 10 | ADC | PB7 · ADC3; PWM | ||
| 11 | ADC | PB4 · ADC0; PWM | ||
| 12 | I2C | I2C | PB6 · I2C SDA; analog in | |
| 13 | I2C | I2C | PB5 · I2C SCL; PWM; analog in | |
| SPI / UART | ||||
| 14 | SPI | SPI | PA12 · Serial3 TX; PWM | |
| 15 | SPI | SPI | PA13 · Serial3 RX; PWM | |
| 16 | SPI | SPI | PA14 · Serial3 RTS | |
| 17 | SPI | SPI | PB26 | |
| 18 | UART | UART | PA7 · Serial1 TX; ISP trigger when low at boot | |
| 19 | UART | UART | PA8 · Serial1 RX | |
| Digital / Debug | ||||
| 20 | GPIO | PA16 · Serial2 / SPI1 MOSI | ||
| 21 | GPIO | PA17 · Serial2 / SPI1 MISO | ||
| 22 | GPIO | PA18 · Serial2 / SPI1 SCK | ||
| 23 | GPIO | PA19 · Serial2 / SPI1 SS | ||
| 24 | Debug | PB3 · SWCLK; 40K pull-down at boot | ||
| 25 | Debug | PA27 · SWDIO; blue LED; 40K pull-up at boot | ||
| 26 | GPIO | PA15 · wake pin; Serial3 CTS | ||
| 27 | GPIO | PA0 | ||