Texas Instruments provides a recommended PCB layout in the DP83901AV datasheet, but it's essential to follow the guidelines for impedance control, signal routing, and decoupling to ensure optimal performance. A 4-layer PCB with a solid ground plane and a separate power plane is recommended.
The DP83901AV can be configured for half-duplex or full-duplex operation using the MODE pins (MODE0 and MODE1). For half-duplex, tie MODE0 to GND and MODE1 to VCC. For full-duplex, tie MODE0 to VCC and MODE1 to GND. Consult the datasheet for more information on the MODE pin settings.
The DP83901AV supports cable lengths up to 100 meters (328 feet) for 10BASE-T and 200 meters (656 feet) for 100BASE-TX. However, the actual cable length may vary depending on the cable quality, noise environment, and system configuration.
The DP83901AV has an internal POR and BOD circuitry. The POR ensures a clean reset during power-up, while the BOD detects voltage drops and resets the device if the voltage falls below a certain threshold. Ensure that the power supply is stable and within the recommended operating range to avoid false resets.
The LED pins (LED0-LED3) are used to indicate the link status, activity, and speed of the Ethernet connection. These pins can be connected to external LEDs to provide visual feedback on the network status.
DP83901AV datasheet
by Texas Instruments
