The multispectral detection device comprises first and second photodetectors sensitive to two different wavelengths. The two photodetectors are connected to two integration capacitors of two different readout circuits. Two reset circuits are configured so as to initialise the two integration capacitors separately. A first synchronisation circuit is connected to the first readout circuit and to the synchronisation signal and clock signal generators. The first synchronisation circuit is configured in such a way as to define the frame by detection of a leading edge of the synchronisation signal, count the number of occurrences of a trailing edge of the clock signal, initiate or terminate a data acquisition phase when the number of occurrences of trailing edges is equal to a threshold value recorded in a register of the first synchronisation circuit.