| Pin | Description |
|---|---|
| +3.3V | Input the power supply of 3.3V DC to this pin. Make sure the DC voltage is in the range of 3.15V ~ 3.45V. It is recommended to use a power supply capable of supplying more than 500mA current while stable output of DC 3.3V for the stable operation of the module. |
| GND | Connect the ground of your main system to this pin. It is recommended that the ground is as wide as possible to shorten the path of return signal. |
| RESET# | This pin is used to restart the system. If you enter a LOW pulse of 1 millisecond (1ms) or more to this pin, the system will restart. Since this pin is LOW Active, normally it should keep it high state(It is internally pulled up with a 10K ohm resistor.) |
| ISP# | ISP# pin is used for initialization. Since this pin is LOW Active, normally it should keep it high state(It is internally pulled up with a 10K ohm resistor.) |
| VBAT | Connect the battery to VBAT so that the built-in RTC time information and back up SRAM contents are not erased when power is not applied. Connect this pin to +3.3V if you do not use any battery. The allowable voltage is DC 1.65V to DC 3.6V. |
| Pin# | Name | I/O | Description |
|---|---|---|---|
| P2.6 | U0TX(0.4) | Out | UIO 0.4 / UART0 TX |
| P2.7 | U0RX(0.5) | In | UIO 0.5 / UART0 RX |
| P2.10 | U1TX(0.10) | Out | UIO 0.10 / UART1 TX |
| P2.11 | U1RX(0.11) | In | UIO 0.11 / UART1 RX |
There are two UARTs, each providing RXD and TXD pins.
※ Notice: You can activate only one of the UART on P4M-440G. The default port is UART0, and you can refer to the AT commands and MQTT configuration for instructions on how to change it.
| Pin# | Name | I/O | Description |
|---|---|---|---|
| P1.3 | TPTX+ | In/Out | Ethernet Transmit + |
| P1.4 | TPTX- | In/Out | Ethernet Transmit - |
| P1.5 | TPRX+ | In/Out | Ethernet Receive + |
| P1.6 | TPRX- | In/Out | Ethernet Receive - |
P4M-440G provides 10/100Base-TX Ethernet Interface. Note that RJ45 connector is required to use Ethernet. Refer to a circuit diagram of the Application Circuit Diagram for the connection.
| Pin# | Name | I/O | Description |
|---|---|---|---|
| P1.7 | VBUS | In | USB Device VBUS |
| P1.8 | USB_D_D- | In/Out | USB Device Data - |
| P1.9 | USB_D_D+ | In/Out | USB Device Data + |
This port must be interfaced for product management and configuration. After connecting this port and connecting the product with PC via a USB cable, you can access the product using the PHPoC Debugger. Either type B USB connector, mini USB or micro USB connector can be used for this port. Please refer to the application circuit diagram for the connection method.
※ Notice: The VBUS pin cannot be used for supplying power to P4M-440G.