MT9P001 Datasheet, PDF (33/48 Pages) ON Semiconductor – CMOS Digital Image Sensor

Figure 24: GRR Snapshot Timing
TRIGGER
STROBE
FV
LV
DOUT
(a) GRR Snapshot
TRIGGER
STROBE
FV
LV
DOUT
(b) GRR Bulb
MT9P001: 1/2.5-Inch 5Mp Digital Image Sensor
Features
TT1
TSE
SW x ^tROW + 2000 x ^tACLK
VB x ^tROW + 2000 x ^tACLK
TSW
TT2
8 x ^tROW
First Row Exposure
Second Row Exposure
tROW
TT1
TSE
TSW TT2
SW x ^tROW + 2000 x ^tACLK
VB x ^tROW + 2000 x ^tACLK
8 x ^tROW
First Row Exposure
Second Row Exposure
tROW
Strobe Control
To support synchronization of the exposure with external events such as a flash or
mechanical shutter, the MT9P001 produces a STROBE output. By default, this signal is
asserted for approximately the time that all rows are simultaneously exposing, minus the
vertical blanking time, as shown in Figure 23 on page 32 and Figure 24. Also indicated in
these figures are the leading and trailing edges of STROBE, which an be configured to
occur at one of several timepoints. The leading edge of STROBE occurs at STROBE_Start,
and the trailing edge at STROBE_End, which are set to codes described in Table 14.
Table 14:
STROBE Timepoints
Symbol Timepoint
Code
TT1
Trigger 1 (start of shutter scan)
–
TSE
Start of exposure (all rows simultaneously exposing) offset by VB
1
TSW
End of shutter width (expiration of the internal shutter width counter)
2
TT2
Trigger 2 (start of readout scan)
3
If STROBE_Start and STROBE_End are set to the same timepoint, the strobe is a ^tROW
wide pulse starting at the STROBE_Start timepoint. If the settings are such that the
strobe would occur after the trailing edge of FV, the strobe may be only ^tACLK wide;
however, because there is no concept of a row at that time. The sense of the STROBE
MT9P001_DS Rev. L 4/15 EN
33
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