Self-checking method for multi-channel PWM output digital circuit

The invention discloses a multi-channel PWM output digital circuit self-checking method, and relates to the field of chip detection, and the multi-channel PWM output digital circuit self-checking method comprises the following steps: 1, setting and outputting the same PWM signals of each channel of a PWM driving chip; step 2, the PWM signals of the channels are output to an OR circuit, when at least one of the PWM signals input by all the channels is' 1 ', a' 1 'signal is output, and otherwise, a' 0 'signal is output; the beneficial effects of the invention are that whether the PWM signals output by the plurality of output channels of the same PWM driving chip are consistent is judged, and when the PWM signals are inconsistent, the feedback PWM driving chip is unqualified; the self-checking circuit adopts the digital clock of the chip to carry out level acquisition and comparison on digital output, so that the problem that a test clock and a chip clock are not synchronous is avoided, detection of all data bit