J16 is a Samtec TMM-108-03-T-D 2x8 2.54mm header that provides connectivity to external peripherals. Various system signals are provided to a header type connector.
| Pin | Signal Name | Description |
| 1 | 3.3V | 3.3V fused at 60ma |
| 2 | 5V | 5V fused at 60ma |
| 3 | WAKE1_N | I - Wakeup signal |
| 4 | I2C_SDA | I/O - I2C data line |
| 5 | LID_N | I - Lid signal |
| 6 | I2C_CLK | O - I2C clock line |
| 7 | SLEEP_N | I - Sleep signal |
| 8 | BATLOW_N | I - low when battery is low |
| 9 | PWR_BTN_N | I - when low, turns on system |
| 10 | THRM_N | I - low indicates thermal overload |
| 11 | SYS_RESET_N | I - when low, resets and reboots |
| 12 | THRMTRIP_N | O - CPU in thermal shutdown |
| 13 | SER0_RX | I - serial channel 0 |
| 14 | SER0_TX | I - serial channel data |
| 15 | GND | Ground |
| 16 | GND | Ground |