The board features two headers for interfacing with the module. One is the standard Apollo.IoT expansion header with the following signals routed to the module:
| Pin | Signal | Description | Observations |
|---|---|---|---|
| 1 | GND | Board ground reference | |
| 2 | VSYS | +3V3 regulated supply | Used as power supply for the node |
| 13 | CAPE_EN1 | PWR signal | Used to power cycle the module |
| 15 | UART2_TXD | ||
| 16 | UART2_RXD | ||
| 23 | UART1_RXD | ||
| 24 | UART1_TXD |
Breakout header:
| Pin | Signal | Description | Observations |
|---|---|---|---|
| 1 | GND | Board ground reference | |
| 2 | VSYS | +3V3 regulated supply | Used as power supply for the node |
| 3 | UART1_RXD | ||
| 4 | UART1_TXD | ||
| 5 | CAPE_EN1 | PWR signal | Used to power cycle the module |
- +3v3 signal should be able to sustain 2A peak signals with a medium consumption of 100mA.
- PWR pin has an internal pull-up. Pull low for at least 100ms to wake the module or power down.
- UART1 is the main communication interface. It supports AT commands for various functions.
- UART2 is used to communicate with a GPS module. The information is accesible via the first UART using AT commands.