CLOSE CONTACT IMAGE SENSOR DRIVING CIRCUIT

PURPOSE:To reduce number of entire flip-flops and to decrease number of components by combining shift registers connected as a loop and a binary counter which counts once every time a signal circulates through the shift registers. CONSTITUTION:When a data signal is inputted, an analog switch 8 is opened and an analog switch 9 is closed and 4-stage of shift registers 3 are shift registers in loop connection. When a clock signal is sent, a binary counter 5 is operated for 4-bit each and when the count is full, the analog switch 8 is closed and the analog switch 9 is opened. In this state, the clock signal is transferred and in the case of 32 bits, the flip-flops are all restored to the initial state at the 33rd clock. Thus, a sensor data is sequentially read from a sensor section.