ALLIED Vision Technologies Bonito CL-400 200 fps - Manual (Page 52)

Parameters and commands
Bonito Technical Manual V2.3.0
52
Basic working principle of the CMOS sensor
A basic understanding of the CMOS sensor‘s working principle is required to
understand how the PIV mode of the Bonito operates. For that reason, a simpli-
fied short explanation is included below.
Each pixel of the sensor is a shutter pixel that includes a photo detector, a pixel
memory, and a number of gates.
The photo detector accumulates the charge produced by light (exposure).
When the electronic shutter gate is open, the charge accumulated in the photo
detector is removed, and the photo detector is reset. During exposure, the elec-
tronic shutter gate is closed.
When the transfer gate opens, the charge is transferred internally from the
photo detector to the pixel memory. The photo detector keeps charging while
the transfer takes place.
At readout, the charge from the pixel memory is converted into a digital signal
that is output via the readout and control architecture to the Camera Link con-
nection.
PIV sequence
Range Either 0 (PIV mode off) or 4 (PIV mode on)
Default 0
Related Parameter J
Example M=4
(0x4 = bx100), sets the bit field to „- - 0 0 - 1 0 0“.
• Activates Image on Demand mode (IOD) (weight = 0)
• Activates PIV mode (weight = 4)
Figure 27: Simplified diagram of the CMOS pixel architecture