E108-GN04S GPS/BDS/GNSS module multi-mode satellite positioning and navigation module
[Communication interface]：UART
[Operating voltage]： 2.7-3.6V
[Communication protocol]： Support NMEA 4.11
[Packaging]：SMD
[Product size]：12.2*16.0*2.4mm
[Introduction]：E108-GN04S is a high-performance, highly integrated, low-power, low-cost multi-mode satellite positioning and navigation module that supports GPS/BDS/GNSS/GLONASS/GALILEO satellite positioning. It has a small size, low power consumption, and SMD packaging. It can be used in GNSS positioning applications such as vehicle navigation, smart wearables, and drones. It also provides software and hardware interfaces that are compatible with other module manufacturers, and supports multiple ways to connect to other peripherals, greatly reducing the user's development cycle.
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| Pin number | Pin name | Pin direction | Pin usage |
| 1 | NC | - | - |
| 2 | SAFEBOOT_N | input | Safe boot mode (low point of activity). If not in use, keep it on. |
| 3 | 1PPS | output | Time pulse signal, 1 Pulse Per Second |
| 4 | EXTINCT | input | External interrupts, if not used, leave them on. |
| 5 | NC | - | - |
| 6 | NC | - | - |
| 7 | NC | - | - |
| 8 | RESET_N | input | Reset pin, external reset input, internal pull-up, pull it low for more than 1ms to reset, if not used, it must be left floating |
| 9 | VCC_RF | output | RF power output, used to power active antennas (the output power voltage is equal to VCC) |
| 10 | GND | - | Modular ground |
| 11 | RF_IN | input | Antenna interface |
| 12 | GND | - | Modular ground |
| 13 | GND | - | Modular ground |
| 14 | LNA_EN | output | Active antenna power supply control, used for external active antenna switch control |
| 15 | NC | - | - |
| 16 | NC | - | - |
| 17 | NC | - | - |
| 18 | NC | - | - |
| 19 | NC | - | - |
| 20 | TXD | output | Serial port output, 3.3V level |
| 21 | RXD | input | Serial port input, 3.3V level |
| 22 | V_BCKP | input/output | RTC power supply, can charge external battery |
| 23 | VCC | input | Power pin, power supply range: 2.7V-3.6V |
| 24 | GND | - | Modular ground |