MT9P006 Datasheet, PDF (31/47 Pages) ON Semiconductor – CMOS Digital Image Sensor

MT9P006: 1/2.5-Inch 5 Mp Digital Image Sensor
Features
Global shutter modes also introduce a constant added to the shutter time for each row,
because the exposure starts during the global shutter sequence, and not during any
row's shutter sequence. For each additional row in a row bin, this offset will increase by
the length of the shutter sequence.
In Bulb_Exposure modes (also detailed later), the exposure time is determined by the
width of the TRIGGER pulse rather than the shutter width registers. In ERS bulb mode, it
is still a multiple of row times, and the shutter overhead equation still applies. In GRR
bulb mode, the exposure time is granular to ACLKs, and shutter overhead (and thus
Shutter_Delay) has no effect.
Operating Modes
In the default operating mode, the MT9P006 continuously samples and outputs frames.
It can be put in "snapshot" or triggered mode by setting snapshot, which means that it
samples and outputs a frame only when triggered. To leave snapshot mode, it is neces-
sary to first clear Snapshot then issue a restart.
When in snapshot mode, the sensor can use the ERS or the GRR. The exposure can be
controlled as normal, with the Shutter_Width_Lower and Shutter_Width_Upper regis-
ters, or it can be controlled using the external TRIGGER signal. The various operating
modes are summarized in Table 13.
Table 13: Operating Modes
Mode
ERS Continuous
ERS Snapshot
ERS Bulb
GRR Snapshot
GRR Bulb
Settings
Default
Snapshot = 1
Snapshot = 1;
Bulb_Exposure = 1
Snapshot = 1;
Global_Reset = 1
Snapshot = 1;
Bulb_Exposure = 1;
Global_Reset = 1
Description
Frames are output continuously at the frame rate defined by ^tFRAME. ERS is used, and the
exposure time is electronically controlled to be ^tEXP.
Frames are output one at a time, with each frame initiated by a trigger. ERS is used, and
the exposure time is electronically controlled to be ^tEXP.
Frames are output one at a time, with each frame's exposure initiated by a trigger. ERS is
used. End of exposure and readout are initiated by a second trigger.
Frames are output one at a time, with each frame initiated by a trigger. GRR is used.
Readout is electronically triggered based on SW.
Frames are output one at a time, with each frame initiated by a trigger. GRR is used.
Readout is initiated by a second trigger.
Note: In ERS bulb mode, SW must be greater than 4 (use trigger wider than ^tROW * 4).
All operating modes share a common set of operations:
1. Wait for the first trigger, then start the exposure.
2. Wait for the second trigger, then start the readout.
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.
MT9P006_DS Rev. E Pub. 5/15 EN
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