LUPA-1300 CYPRESS [Cypress Semiconductor], LUPA-1300 Datasheet - Page 25

• Manufacturer Part Number: LUPA-1300
• Description: 1.3 M Pixel High Speed CMOS Image Sensor
• Manufacturer: CYPRESS [Cypress Semiconductor]

Vmemory, row select and Vpix. These are internal generated signals derived by on
chip drivers from external applied signals. Consequently it is important to understand
the relation between both internal and external signals and to understand the operation
of the pixel.
The timing of the pixel is given in figure 12 in which only the internal signals are
given.
At the end of the integration time, the information on the photodiode node needs to be
sampled and stored onto the pixel memory, required to allow synchronous shutter.
To do this, we need the signals “Precharge” and “Sample”. “Precharge” resets the
pixel memory and “Sample” places the pixel information onto the pixel memory.
Once this information stored, the readout of the pixel memories can start in parallel
with a new integration time.
larger output swing.
Except from Vpix power supply, drivers generate the other pixel signals on chip. The
external signals to obtain the required pulses consist of 2 groups. One is the group of
digital signals to indicate when the pulse must occur and the other group is dc-supply
lines indicating the levels of the pulses. Table 9 summarizes the relation between the
internal and external pixel array signals
The Precharge and Sample signals are the most straightforward signals. The internal
Cypress Semiconductor Corporation
Contact [e-mail]
Precharge
Sample
Reset
Vmemory
Internal
signal
LUPA-1300
Datasheet
Table 9: overview of the internal and external pixel array signals.
Vlow
4.5V
0V
0
0
Figure 12: Internal timing of the pixel.
Document # : 38-05711 Rev.**( Revision 3.1)
3901 North First Street
Vhigh
4 – 6V
An additional signal “Vmem” is needed to obtain a
5V
5V
6V
Precharge
External
Reset_ds
Mem_hl
Reset &
control
Sample
signal
San Jose, CA 95134
Gnd_res
Vmem_l
Low dc
level
Gnd
Gnd
Page 25 of 48
408-943-2600
Vmem_h
High dc
Vres_ds
Vres &
Vddr
Vddr
level