An image sensor including an optoelectronic conversion circuit, a read circuit, a timing control and a serial interface is provided. The optoelectronic conversion circuit is configured to store a charge amount. The read circuit is coupled to the optoelectronic conversion circuit via a bit line. The timing control is configured to send at least one control signal to control the optoelectronic conversion circuit to store the charge amount and control the read circuit to read the charge amount stored in the optoelectronic conversion circuit. The serial interface is coupled to the timing control and configured to send a trigger signal to the timing control to activate the timing control to send the at least one control signal.