MT9D011 Datasheet, PDF (47/61 Pages) Micron Technology – 1/3-INCH 2-MEGAPIXEL CMOS ACTIVE-PIXEL DIGITAL IMAGE SENSOR

PRELIMINARY
MT9D011
2-MEGAPIXEL DIGITAL IMAGE SENSOR
Integration Time
Integration time is controlled by Reg0x09 (shutter
width in multiples of the row time) and Reg0x0C (shut-
ter delay, in PIXCLK_PERIOD/2). Reg0x0C is used to
control sub-row integration times and only has a visi-
ble effect for small values of Reg0x09. The total integra-
tion time, ^tINT, is shown in the equation below:
t_{INT = Reg0x09*Row Time - Integration Overhead - Shutter Delay}
where:
Row Time = (Reg0x04/S + BORDER + HBLANK_REG)*PIXCLK_PERIOD master clock periods (from Table 3 on
page 12)
S = Skip Factor, multiplied by 2 if binning is enabled
Overhead Time = 260 master clock periods (262 in 1 ADC mode)
Shutter Delay = Reg0x0C*PIXCLK_PERIOD master clock periods (/2 in 1 ADC mode)
with default settings:
t_{INT = (1232*(1600 + 348)) - 260 - 0}
= 2,399,676 master clock periods = 66.66ms@36 MHz
In the equation, the Integration Overhead corre-
sponds to the delay between the row reset sequence
and the row sample (read) sequence.
Typically, the value of Reg0x09 is limited to the
number of rows per frame (which includes vertical
blanking rows), so that the frame rate is not affected by
the integration time. If Reg0x09 is increased beyond
the total number of rows per frame, the sensor adds
blanking rows as needed. Additionally, ^tINT must be
adjusted to avoid banding in the image caused by light
flicker. Therefore, ^tINT must be a multiple of 1/120 of a
second under 60Hz flicker, and a multiple of 1/100 of a
second under 50Hz flicker.
Maximum Shutter Delay
The shutter delay can be used to reduce the integra-
tion time. A programmed value of N reduces the inte-
gration time by N master clock periods. The maximum
shutter delay is set by the row time and the sample
time, as shown in the equation below:
Maximum shutter delay = (Row Time - pointer_operations)
where:
Row Time = (Reg0x04/S + BORDER + HBLANK_REG)*PIXCLK_PERIOD master clock periods (from Table 3 on
page 12)
S = Skip Factor, multiplied by 2 if binning is enabled
pointer_operations = see Table 11 on page 43.
with default settings:
Maximum shutter delay = (1600 + 348) - 461
= 1487 (master clock periods)
If the value in this register exceeds the maximum
value given by this equation, the sensor may not gen-
erate an image.
09005aef81516da4
MT9D011__MI2010_E_2.fm - Rev. A 11/04 EN
47
Micron Technology, Inc., reserves the right to change products or specifications without notice.
©2004 Micron Technology, Inc. All rights reserved.