Laser distance-measuring receiving chip and its configuration method in the course of calibration

A method for configuring a laser distance-measuring device, the method comprising:

• providing a single-photon avalanche diode (SPAD) array comprising SPAD units and a time-to-digital converter (TDC) array comprising TDC units, wherein a number of TDC units is fewer than a number of SPAD units;
• configuring a bus matrix comprising a plurality of buses and a plurality of switches to connect the SPAD units to the TDC units;
• storing configuration information in a region of interest (ROI) configuration register, the configuration information comprising a segmentation of the light bar into sub-light bars, the position of the pixel where each segment of the sub-light bar is located, the number of SPAD units in one pixel, the value of a pixel selection signal, and the value of a TDC selection signal;
• setting the configuration information by the chip during a calibration process;
• determining, using a SPAD and bus routing controller, the position where the SPAD units need to be opened based on the position of the pixel where each segment of the sub-light bar is located and the number of SPAD units in one pixel;
• controlling the corresponding SPAD units to open based on the determined position;
• transmitting the value of the pixel selection signal and the value of the TDC selection signal to the bus matrix to control the switch gating in the bus matrix;
• outputting the opened SPAD data through the corresponding TDC unit.