[Chip solution]：AT6558R
[Communication interface]：UART/GPIO
[Operating voltage]：2.7-3.6V
[Communication protocol]：NMEA0183 V4.1 and previous versions
[Product size]：12.2*16.0*2.4mm
[Introduction]：E108-GN03S is a high-performance, highly integrated, low-power, low-cost multi-mode satellite positioning and navigation module based on the AT6558R solution, supporting GPS/BDS/GNSS/GLONASS, small size, low power consumption, can be used in GNSS positioning and navigation applications such as vehicle navigation, smart wearables, and drones, and provides software and hardware interfaces compatible with other module manufacturers, greatly reducing the user's development cycle. It also supports multiple ways to connect to other peripherals, supports UART, GPIO interfaces, if you need I2C, SPI interfaces, please contact customer service for customization.
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| Pin number | Pin name | Pin direction | Pin usage |
| 1 | NC | - | - |
| 2 | MODEL_SET | Input | Satellite system mode selection, when high level or floating, it is BDS + GPS, when low level, it is GPS + GLONASS |
| 3 | 1PPS | output | 1 Pulse Per Second |
| 4 | ON_OFF | Input | Sleep control, maintain high level during normal operation (internal pull-up), enter sleep mode when low level |
| 5 | NC | - | - |
| 6 | NC | - | - |
| 7 | NC | - | - |
| 8 | RESET_N | Input | Reset pin, external reset input, internal pull-up, must be left floating if not used |
| 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 | ANT_ON | 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, internal 100Ω resistor in series |
| 23 | VCC | Input | Power pin, power supply range: 2.7V-3.6V |
| 24 | GND | - | modular ground |