LUPA-4000 CYPRESS [Cypress Semiconductor], LUPA-4000 Datasheet - Page 28
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LUPA-4000
Manufacturer Part Number
LUPA-4000
Description
4M Pixel CMOS Image Sensor
Manufacturer
CYPRESS [Cypress Semiconductor]
Datasheet
1.LUPA-4000.pdf
(49 pages)
- Current page: 28 of 49
- Download datasheet (2Mb)
LUPA-4000
Data Sheet
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 Mem_hl, Precharge and Sample. When
precharge is activated it serves as a load for the first source follower in the pixel.
Sample stores the photodiode information onto the memory element. Mem_hl pumps
up this value to reduce the loss of signal in the pixel and this signal must be the
envelop of Precharge and Sample. After Mem_hl is high again, the readout of the
pixel array can start. The frame blanking time or frame overhead time is thus the time
that Mem_hl is low, which is about 5 µ sec. Once the readout starts, the photodiodes
can all be initialised by reset for the next integration time. The minimal integration
time is the minimal time between the falling edge of reset and the rising edge of
sample. Keeping the slow fall times of the corresponding internal generated signals in
mind, the minimal integration time is about 2 µ sec.
An additional reset pulse of minimum 2 µ sec can be given during integration by
asserting Reset_ds to implement the double slope integration mode.
Cypress Semiconductor Corporation
3901 North First Street
San Jose, CA 95134
408-943-2600
Contact:
info@Fillfactory.com
Document #: 38-05712 Rev.**(Revision 1.2 )
Page 28 of 49
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