LR38603 View Datasheet(PDF) - Sharp Electronics
Part Name
Description
MFG CO.
'LR38603' PDF : 26 Pages View PDF
LR38603
AUTOMATIC CAMERA FUNCTION
CONTROL
Automatic Electronic Exposure Control
Electronic shutter speed is controlled so that the
exposure control data approach the data of
REF_IRIS1 (address 06h).
Under BLC mode, the data of REF_IRIS2 (address
09h) are available instead of REF_IRIS1.
If the exposure control data are less than the data
of CTLD_AGC (address 07h), an electronic shutter
speed is held. And then PGA gain is controlled so
that the exposure control data will be less than the
data of CTLD_0 (Address 08h).
If the exposure control data are greater than the
data of CTLD_AGC (address 07h), exposure
control starts again.
Electronic Shutter Speed Setting
Electronic shutter speeds below can be selected by
either hardware or coefficient data.
EEMDS
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
EEMD1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
EEMD2
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
EEMD3
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
ELECTRONIC SHUTTER SPEED
NTSC
PAL
1/60 s
1/50 s
1/100 s
1/120 s
1/250 s
1/250 s
1/500 s
1/500 s
1/1 000 s
1/1 000 s
1/2 000 s
1/2 000 s
1/5 000 s
1/5 000 s
1/10 000 s
1/10 000 s
1/20 000 s
1/20 000 s
1/50 000 s
1/50 000 s
1/100 000 s
1/100 000 s
1/30 s
1/25 s
1/15 s
1/12.5 s
1/7.5 s
1/6.25 s
AUTO
AUTO
1/60 s to MAX_SH (address 05h) 1/50 s to MAX_SH (address 05h)
AUTO
AUTO
1/60 s to 1/100 000 s
1/50 s to 1/100 000 s
A slower shutter speed of less than 1/60 s (1/50 s
of PAL) can make images whose interval is every
two fields, every four fields, etc.
VD pulse is also converted to the same frequency
as the output image rate.
Electronic exposure control data come from the
following equation using averaged luminance levels
of 64 areas in one image, made by DSP.
20
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