MT9P001 Datasheet, PDF (32/48 Pages) ON Semiconductor – CMOS Digital Image Sensor

MT9P001: 1/2.5-Inch 5Mp Digital Image Sensor
Features
The first trigger is by default automatic, producing continuous images. If snapshot is set,
the first trigger can either be a low level on the TRIGGER pin or writing a “1” to the
trigger register field. If Invert_Trigger is set, the first trigger is a high level on TRIGGER
pin (or a “1” written to trigger register field). Because TRIGGER is level-sensitive,
multiple frames can be output (with a frame rate of ^tFRAME) by holding TRIGGER pin at
the triggering level.
The second trigger is also normally automatic, and generally occurs SW row times after
the exposure is started. If Bulb_Exposure is set, the second trigger can either be a high
level on TRIGGER or a write to Restart. If Invert_Trigger is set, the second trigger is a low
level on TRIGGER (or a Restart). In bulb modes, the minimum possible exposure time
depends on the mechanical shutter used.
After one frame has been output, the chip will reset step 1, above, eventually waiting for
the first trigger again. The next trigger may be issued after ((VB - 8) x ^tROW) in ERS
modes or ^tALLREST in GRR modes.
The choice of shutter type is made by Global_Reset. If it is set, the GRR shutter is used;
otherwise, ERS is used. The two shutters are described in “Electronic Rolling Shutter” on
page 30 and “Global Reset Release” on page 30.
The default ERS continuous mode is shown in Figure 8 on page 13. Figure 23 shows
default signal timing for ERS snapshot modes, while Figure 24 on page 33 shows default
signal timing for GRR snapshot modes.
Figure 23: ERS Snapshot Timing
TRIGGER
STROBE
FV
LV
DOUT
(a) ERS Snapshot
TSW
TT1
TSE
TT2
SW x ^tROW
(H + VB) x ^tROW
8 x ^tROW
8 x ^tROW
tROW
First Row Exposure
Second Row Exposure
tROW
TRIGGER
STROBE
FV
LV
DOUT
(b) ERS Bulb
TT1
TSE TSW TT2
SW x ^tROW
(H + VB) x ^tROW
8 x ^tROW
8 x ^tROW
tROW
First Row Exposure
Second Row Exposure
tROW
MT9P001_DS Rev. L 4/15 EN
32
©Semiconductor Components Industries, LLC,2015.