Patent ID: 8399848

Claim:
A detector pixel comprising: a trigger line; a digital data bus; a plurality of detector cells, each detector cell including: a photodiode biased in a breakdown region, digital circuitry coupled with the photodiode, the trigger line, and the digital data bus, the digital circuitry being configured to output a first digital value in a quiescent state and a second digital value responsive to detection of a photon by the photodiode, quenching circuitry configured to transition the detector cell back to the quiescent state after detection of a photon by the photodiode; digital triggering circuitry connected to the trigger line and configured to start an integration time period responsive to a selected number of one or more of the detector cells transitioning from the first digital value to the second digital value; and pixel level readout digital circuitry connected to the digital data bus that accumulates a digital count of a total number of transitions of the plurality of detector cells from outputting the first digital value to outputting the second digital value accumulated over the integration time period started by digital triggering circuitry.