Table 2.
Pin socket 2 pin definition.
| Serial number | Name | Type | Detailed description |
|---|---|---|---|
| 1 | VCC | PWR | 5 V power input pin |
| 2 | VCC | PWR | 5 V power input pin |
| 3 | ADIN0 | ADINO | Analog input pin, AD acquisition input 0 |
| 4 | ADIN1 | ADIN1 | Analog input pin, AD acquisition input 0 |
| 5 | GND | GND | GND pin of 5 V power supply |
| 6 | GND | GND | GND pin of 5 V power supply |
| 7 | ESCL | 0 | SCL pin of expansion device IIC bus |
| 8 | ESDA | IO | The SDA pin of the expansion device IIC bus |
| 9 | ETXD | 0 | TXD pin of UART, TTL level |
| 10 | ETXD | I | RXD pin of UART, TTL level |
| 11 | EGPI00 | IO | External logic input pins, used as networking control buttons when the system is started |
| 12 | EGPI01 | IO | External logic input pins, used as networking control buttons when the system is started |
| 13 | GND | PWD | GND pin of 5 V power supply |
| 14 | GND | PWD | GND pin of 5 V power supply |
| 15 | EG POO | 0 | External logic control output pin, programmable control |
| 16 | INT | I | External logic control output pin, programmable control |
| 17 | EREQ | 0 | Peripheral function request handshake request signal output |
| 18 | EACK | I | Peripheral function request handshake response signal input |
| 19 | RSV5 | P | Reserved pins, do not connect |
| 20 | RESET | I | Module overall control signal input, low effective |