MCM20027 Motorola, MCM20027 Datasheet - Page 25

• Manufacturer Part Number: MCM20027
• Description: Color SXGA Digital Image Sensor 1280 x 1024 pixel progressive scan solid state image sensor with integrated CDS/PGA/ADC / digital programming / control
• Manufacturer: Motorola

Revision 8.0 - 28 November 2001 :
MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
To ensure that Strobe signal fires, the integration time
must be large enough to ensure that all rows are inte-
grating simulanteously for at least 2 Row periods (T
(see
page
where T
To accomplish this - ensure that the Integration time
(cint
the active Window of Interest Row depth.
Min. Integration time =T
where wrd
T
T
EXAMPLE: Below you will find an example of how to
ensure that the strobe signal will fire and to determine
the length of the STROBE signal in default mode:
(Refer to
Goal (For example purpose):
Strobe Signal that lasts for at least 250us, which is the
length of a typical strobe/flash event.
Assumptions:
1) Active Window of Interest = 1280 x 1024
2) Virtual Column Width (vcw
3) Virtual Row Depth (vrd
4) Sample & hold time (shs
5) Sample & hold time (shr
6) MCLK = 13 Mhz
ie. (wcw
strobe1
strobe2
(wrd
d
“Frame Rate and Integration Time Control” on
13)
) greater than 2 Row periods (T
= T
= T
row
d
d
Figure 16, on page 24
)=1023
)=1279
d
row
intmin
= (vcw
is the Window Of Interest Row depth.
cint
- (wrd
min
d
+ shs
=wrd
d
d
+1)*T
) = 1034
d
d
) = 10
intmin
) = 10
d
d
d
MCM20027
+x
)= 1290
+ shr
row
=
(cint
for timing analysis)
where x > 2
d
+ 19)
min
row
+1)*T
) larger than
row
row
)
Variables:
Integration Time (cint
the time of the Strobe signals.
T
Calculations:
Row Time =Trow = (vcwd + shsd + shrd + 19)
T
Let
Therefore,
T
T
T
Results:
NOTE!! Refer to
analysis
cint
intmin
intmin
intmin
strobe1
strobe2
cint
min
T
T
Signal
T
strobe1
strobe2
T
=
=
= 101.39
=wrd
T
frame
min
= 3 * T
= 295us
= 98.44 s
= T
row
(cint
(cint
int
= 1023 + 4 = 1029
= wrd
intmin
min
min
d
+x
row
+1)*T
+1)*T
= (1290 + 10 + 10 + 19) / 13.5e6
= 98.44 s
d
- (wrd
+x
Figure 16, on page 24
where x > 2
min
row
row
) is the main variable used to control
d
where x > 2
101ms
202ms
Value
295us
+2)*T
98us
98us
row
ImageMOS
ImageMOS
where x=4
for timing
MOTOROLA
25