LUPA-1300 CYPRESS [Cypress Semiconductor], LUPA-1300 Datasheet - Page 28

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

4 Timing
4.1 Timing of the pixel array
The timing of the image sensor can be divided in two major parts. The first part of
the timing is related with the timing of the pixel array. This implies the control of the
integration time, the synchronous shutter operation, and the sampling of the pixel
information onto the memory element inside each pixel. The signals needed for this
control are described in previous paragraph 3.7.3 and figure 12 shows the timing of
the internal signals. Figure 13 should make the timing of the external signals clear.
The timing of the pixel array is straightforward. Before the frame is read, the
information on the photodiode needs to be stored onto the memory element inside the
pixels. This is done by means of the signals Vmemory, Precharge and Sample.
Precharge sets the memory element to a reference level and Sample stores the
photodiode information onto the memory element. Vmemory pumps up this value to
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Figure 13: timing of the pixel array. All external signals are digital signals between
LUPA-1300
Datasheet
0 and 5V. The Reset_ds is only required in case dual slope is desired.
Symbol
a
b
c
d
e
f
Table 10: Typical timings of the pixel array
Document # : 38-05711 Rev.**( Revision 3.1)
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Name
Mem_HL
MEM_HL –Precharge
Precharge
Sample
Precharge-Sample
Integration time
San Jose, CA 95134
Value
> 5 µ sec
> 200 nsec
> 500 nsec
> 3.9 µ sec
> 400 nsec
>
2 µ sec
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