We are using the ADIN1100 in an application that must meet Ex ia hazardous locations standards. A question has come up about the 1.0 Vp-p transmit magnitude of the T1L signal coming out of the spur power source ports on our product.
We have pin 31 (RXD_0/nTS2P4_EN) pulled high through a resistor to force the spur PHYs into 1.0 Vp-p mode. I am looking at the datasheet and it says on Page 25 that pulling pin 31 high disables 2.4 Vp-p mode. It also says in a couple places "1.0 V p-p transmit level operation is required for intrinsically safe operation".
Is there any way for software configuration of the PHY through the MDIO interface to override the configuration value of the resistor and allow the PHY to be put into 2.4 Vp-p mode? I understand that puling pin 31 high will disable advertising of 2.4Vp-p mode for auto negotiation purposes, but would it be possible to disable auto negotiation and force B10L_TX_LVL_HI to '1' and enable 2.4 Vp-p mode?
This is critical because it will impact the Uo entity parameter for the spur ports.