PI0512WS Page 5 of 8 – July 26, 2001

I/O Pins

Although the PI0512WS package has 22 pins as shown in Figure 1, there are only 6

functionally active I/O pins in addition to the supply and bias pins as shown in Figure 5.

Table 1 defines the I/O acronyms, provides their full names and describes their functions. In

essence, only two clocks, CLK and START, are required for controlling the timing of the

sensor's video readout if the internal reset circuitry is not used. However, if the internal reset

circuitry is used, a third clock signal, RESET, is required. The remaining I/O descriptions are

for the video signal output, the end-of-scan signal, and the bias and supply voltage. These

I/Os are listed with their acronym designators and functional descriptions in the following

Table 1.

Table 1. Symbols and functions and I/O pins.

Symbol

Function and Description

VSS

Ground.

VDD

+5.0 Volts.

START

Start Pulse: Input to start the line scan.

CLK

Clock Pulse: Input to clock the shift register.

EOS

End Of Scan: Output from the shift register to indicate the

completion of one line scan.

AVIDEO Active Video Line: Charge output from the photodiodes pixels.

RESET

Reset Control Gate: Pulsing this input will reset the video line to

the reset bias.

BIAS

Reset Bias Supply: Input bias reference resetting the video line.