Tool/software:
I need to set AN_0 to 1, this means I need to set LED_0 (PULL UP PIN) to MODE 4 which means RH and RL should be OPEN, I still want to use the LED function. does this means I just need to have my LED and current limiting resistor? or is there a specific way to do this?
Hi,
Are you in DP83826 Basic or Enhanced Mode? In Basic Mode, FLD is always enabled and the default mechanisms in BASIC mode is RX error and signal/energy loss. In Enhanced Mode, FLD is strap controllable.
In BASIC mode, the LED polarity is always be active low. In the case that the LED pin must be strapped low, a 1kΩ pull-up resistor in series with the LED must be used and a 1.5kΩ pull-down resistor. This results in the strap selecting 0. Please note that using higher resistance can decrease the brightness of the LED.
In ENHANCED mode, the LEDs have auto-polarity detection. The LED drive adjusts according to the strap configured on the pin. For example, if the LED pin is configured for a pull-down strap, then the PHY assigns the LED polarity as active high. If the LED pin is configured with a pull-up, the PHY assigns the LED polarity as active low.
Below shows the LED strapping example,
Thanks
David
