MT9M019 Aptina Imaging Corporation, MT9M019 Datasheet - Page 34

• Manufacturer Part Number: MT9M019
• Description: 1/5-Inch 1.3Mp CMOS Digital Image Sensor
• Manufacturer: Aptina Imaging Corporation

Flash Control
Figure 18:
Figure 19:
PDF: 7723845879/Source:2828556980
MT9D019_DS - Rev. F 5/10 EN
Xenon Flash Enabled
LED Flash Enabled
Note:
Setting an integration time that is greater than the frame time therefore increases the
frame time beyond frame_length_lines to make longer exposure times available. Note
that the frame length is now set by (coarse_integration_time -
coarse_integration_time_max_margin) rather than the frame_length_lines. This should
be taken into account for all other formulae used in this document. It is fundamental to
the operation of an ERS that it is not possible to set an integration time that is greater
than the frame time.
The MT9M019 supports both xenon and LED flash through the FLASH output signal.
The timing of the FLASH signal with the default settings is shown in Figure 18, 19, and
20. The flash and flash_count registers allow the timing of the flash to be changed. The
flash can be programmed to fire only once, be delayed by a few frames when asserted,
and (for Xenon flash) the flash duration can be programmed.
Enabling the LED flash will cause one bad frame, where several of the rows only have the
flash on for part of their integration time. This can be avoided by forcing a restart (write
reset_register[1] = 1) immediately after enabling the flash; the first bad frame will then be
masked out as shown in Figure 20. Read-only bit flash[14] is set during frames that are
correctly integrated; the state of this bit is shown in Figures 18, 19 and Figure 20 on
page 35.
State of Triggered Bit
State of Triggered Bit
Integration time = number of rows in a frame.
(R0x3046-7[14])
(R0x3046-7[14])
FRAME VALID
FRAME VALID
Flash STROBE
Flash STROBE
Flash enabled
during this frame
Bad frame
34
MT9M019: 1/5-Inch 1.3Mp CMOS Digital Image Sensor
Good frame
Aptina reserves the right to change products or specifications without notice.
Good frame
©2006 Aptina Imaging Corporation. All rights reserved.
during this frame
Flash disabled
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Bad frame
Features