Selectable real time sample triggering for a plurality of inputs of an analog-to-digital converter

A pulse width modulation (PWM) control system for monitoring a plurality of analog input signals, comprising:

• a plurality of analog inputs, each to receive an analog input signal;
• a plurality of sample and hold circuits, each comprising an input selectively coupled to at least one of the plurality of input and an output;
• at least one analog-to-digital converter (ADCs), comprising an input and an output;
• a plurality of trigger selection circuits, for selectively coupling a selected one of the plurality of analog inputs to a corresponding one of the plurality of sample and hold circuits;
• and
• at least one analog multiplexer, comprising a plurality of inputs selectively coupled to one or more of the sample and hold circuit outputs and an output coupled to one of the one or more ADCs.

A method for converting a plurality of analog input signals to digital output signals, comprising:

• associating each of the plurality of analog input signals with at least one trigger signal;
• detecting if at least one trigger signal associated with one of the analog inputs is active and, if so:
• sending a sample request signal to a sample request latch;
• if a sample and hold circuit associated with the analog input signal is available, switching the analog input to the sample and hold circuit associated with the analog input signal to sample and hold the analog input associated with the one or more trigger signals;
• sending a sample ready signal to a request for conversion selection circuit;
• if an analog-to-digital converter is available, and the sample and hold circuit associated with the sampled analog input signal is the highest priority requester, sending the sampled analog input signal to the analog to digital converter;
• converting the sampled and held analog input signal to a digital value;
• and
• storing the digital value in a result register.