CXD2452R Datasheet, PDF (14/28 Pages) Sony Corporation – Timing Generator for Progressive Scan CCD Image Sensor

CXD2452R
[High-speed/low-speed shutter mode]
During this mode, the data has the following meanings.
Symbol
Shut.FRM
Shut.HD
Data
Description
D18 to D25 Shutter speed data (number of vertical intervals) specification
D26 to D35 Shutter speed data (number of horizontal intervals) specification
The CXD2452R does not distinguish between the high-speed shutter and low-speed shutter modes. The
interval during which Shut.FRM and Shut.HD are specified together is the shutter speed. At this time,
Shut.FRM controls the XSG1, XSG2 output, and Shut.HD controls the XSUB output. Concretely, when
specifying high-speed shutter, Shut.FRM is set to 00h. (See the figure.) During low-speed shutter, or in other
words when Shut.FRM is set to 01h or higher, the serial interface data is not loaded until this interval is
finished.
However, care should be taken as the vertical interval indicated here is set in 1/60s units when the drive mode
is monitoring drive mode and 1/30s units during recording drive mode.
For monitoring drive mode, care should be taken that shut.HD value is offset. This is because the same
exposure time can be obtained for the same shut.HD data without depending on drive mode basically for high-
speed shutter.
Formula for calculating the electronic shutter speed: [Shut.FRM/Shut.HD] (unit: µs)
Monitoring drive mode:
T = Shut.FRM∗1.66834∗10⁴ + {(20Ch – Shut.HD)∗780 + 447} ∗81.5∗10^–3 (107h ≤ Shut.HD ≤ 20Ch)
FRI
XSG1
XSUB
SMD
Shut. FRM
Shut. HD
WEN
01
00h
1A6h
Shut.HD-106h
01
01h
1DDh
Shut.FRM
01
00h
1A6h
During monitoring drive mode/low-speed shutter mode
Recording drive mode:
T = Shut.FRM∗3.33667∗10⁴ + {(20Ch – Shut.HD)∗780 + 447} ∗81.5∗10^–3 (000h ≤ Shut.HD ≤ 20Ch)
FRI
XSG1
XSUB
SMD
Shut. FRM
Shut. HD
WEN
Shut.HD
01
01h
1DDh
Shut.FRM
During recording drive mode/low-speed shutter mode
– 14 –
01
00h
1A6h