HB7121BELECTRONICS Datasheet, PDF (20/29 Pages) Hynix Semiconductor – CMOS IMAGE SENSOR With 8-bit ADC

Electronics Industries Co., Ltd.
System IC Division
FRAME TIMING DIAGRAMS
PRELIMINARY
HB7121B
CMOS IMAGE SENSOR
With 8-bit ADC
There are two frame timing cases,
l Integration Time < EffectiveWindowHeight * Scale
l Integration Time > EffectiveWindowHeight * Scale
EffectiveWindowHeight is equal to the number of data lines generated in a frame and is defined to be
selected by
if((RowStartAddress + WindowHeight + 1) <= (SensorArrayHeight)
EffectiveWindowHeight = WindowHeight;
else
EffectiveWidnowHeight = (SensorArrayHeight - RowStartAddress - 1);
For example, RowStartAddress = 200 and WindowHeight = 300, EffectiveWindowHeight is 113 and 113
data lines per a frame are generated.
Note : The above selection logic is somewhat confusing in respect of general counting measure. It’ s partly
due to the mixed use of indexing start points, i.e. ‘ 0’ and ‘ 1’ in the design. Therefore in order to avoid the
confusion it is desirable to just follows the equation when you estimate the frame rate.
SensorArrayHeight
[314]
SensorArrayWidth
[414]
(0,0)
EffectiveWindowHeight
[113]
RowStartAddress
[200]
WindowHeight
[300]
Scale is selected according to Integration Time Mode by
If(PixelMode) Scale = SensorArrayWidth; // For400*300 resolution chip, SensorArrayWidth is 414
else
Scale = 1;
This document is a general product description and is subject to change without notice. Hyundai Electronics does not assume
any responsibility for use of circuits described. NO patent licenses are implied.
DA21991011R_1.0
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1999 Hyundai System IC Division