Lighting controller with multiplexed mutlimode dimming interface

A lighting controller for controlling illumination of a lighting fixture, the lighting controller comprising:

• a microcontroller;
• a first dimming circuit that, when activated by the microcontroller, utilizes a digital addressable lighting interface (DALI) protocol to produce a first dimming signal;
• a second dimming circuit that, when activated by the microcontroller, utilizes a non-DALI dimming technology to produce a second dimming signal;
• a DALI bus over which direct current power is supplied to at least the first dimming circuit and that is used by the first dimming circuit to communicate the first dimming signal to the lighting fixture;
• and
• a multiplexing circuit operable to selectively couple an output of either the first dimming circuit or the second dimming circuit to a dimming output responsive to receipt of a dimming control signal, the multiplexing circuit including a first set of diodes to isolate the second dimming circuit from the DALI bus when the second dimming circuit is deactivated and the first dimming circuit is activated;
• wherein the first dimming circuit includes a second set of diodes to isolate the second dimming circuit from the DALI bus when the first dimming circuit is deactivated and the second dimming circuit is activated.