NOIL1SM4000A-GDC ON Semiconductor, NOIL1SM4000A-GDC Datasheet - Page 14

• Manufacturer Part Number: NOIL1SM4000A-GDC
• Description: LUPA4000 MONO PGA127
• Manufacturer: ON Semiconductor

Specifications of NOIL1SM4000A-GDC

• Lead Free Status / Rohs Status: Supplier Unconfirmed

Table 6.
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frame is read, the information on the photodiode must be
stored onto the memory element inside the pixels. This is
done with 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
sequential selection of all pixels. The FOT is the overhead
time between two frames to transfer the information on the
photodiode to the memory elements. Figure 14 shows that
Table 6. TIMING SPECIFICATIONS
Timing specifications for each signal are shown in
The timing of the pixel array is straightforward. Before the
The readout of an image consists of the FOT and the
Falling edge of precharge is equal or later than falling
edge of Vmem.
Sample is overlapping with precharge.
Rising edge of Vmem is more than 200 ns after rising
edge of sample.
Rising edge of reset is equal or later than rising edge of
Vmem.
Symbol
a
b
c
d
e
Mem_HL
Precharge
Sample
Precharge−Sample
Integration time
Name
Figure 15. Readout of Image Sensor (L: line selection, C: column selection)
FOT
ROT
5 − 8.2 ms
3 − 6 ms
5 − 8 ms
> 2 ms
> 1 ms
Readout frame I
Value
http://onsemi.com
Readout Pixels
Readout Lines
14
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 starts.
The frame blanking time or frame overhead time is thus the
time that Mem_hl is low, which is about 5 ms. After 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 ms.
during integration by asserting Reset_ds to implement the
double slope integration mode.
Readout of Image Sensor
element of each pixel, it can be read out sequentially.
Integration and readout can also be done in parallel.
sync and clock pulses.
readout of a frame consists of the frame overhead time, the
selection of the lines sequentially, and the readout of the
pixels of the selected line.
at this time Mem_hl is low (typically 5 ms). After the FOT,
the information is stored into the memory elements and a
sequential selection of rows and columns makes sure the
frame is read.
An additional reset pulse of minimum 2 ms can be given
When the pixel information is stored in the memory
The readout timing is straightforward and is controlled by
Figure 15 shows the top level concept of this timing. The
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Integration I+2
C2048
L2048