Re: Center-taps of isolation transformers for use in ENC28J60
Thank you for the information.
LAN-Transformer for connection with ENC28J60 has two isolation transformers with their center-taps not connected together, and has termination impedances at cable side. For passive 10Mbps PoE powered devices, spared pair 4 & 6 and another spared pair 7 & 8 carry DC+ and DC- voltages respectively, and have DC blocking capacitors in their termination. All these are necessary requirements to LAN-Transformer for ENC28J60 serving as passive PoE powered device. If there is any additional requirement, please inform me.