icx434 Sony Electronics, icx434 Datasheet - Page 20

• Manufacturer Part Number: icx434
• Description: Timing Generator For Frame Readout Ccd Image Sensor
• Manufacturer: Sony Electronics

[HTSG control mode]
This mode controls the V1, V3A/B and V5A/B (for the ICX432) ternary level outputs (readout pulse block) using
D21 HTSG.
[EXP pulse]
The ID/EXP pin (Pin 4) output can be switched between the ID pulse or the EXP pulse using D33 EXP. The
default is the "ID" pulse. See the Timing Charts for the ID pulse. The EXP pulse indicates the exposure time when
it is high. In principle, the transition points are the last SUB pulse falling edge and the readout pulse falling edge,
that is to say from the time the charge is completely discharged until transfer ends. However, when the readout
pulse timing differs within the same readout block such as in draft mode, the average value is used. Then, when
there is no SUB pulse in the next field, the readout pulse falling edge is defined as the start position. However, in
this case the transition points overlap and disappear, so a tentative start position is defined.
This is shown below.
See the EXP pulse indicated in the explanatory diagrams under [Electronic shutter] for an image of operation.
[ICX432]
[ICX434]
D21
0
1
Exposure time
Readout pulse (SG) normal operation
HTSG control mode
Frame mode
Draft/AF mode
Frame mode
Draft mode
HTSG
SMD
WEN
SUB
EXP
V3A
Description of operation
VR
0
1
A: 1071
B: 1175
SG
1460
1682
1123
Tentative start position
– 20 –
1480
1784
1091
1195
1175
1
0
1
0
CXD3615R