MT9V012 Micron, MT9V012 Datasheet - Page 36

• Manufacturer Part Number: MT9V012
• Description: 1/6-Inch VGA CMOS Digital Image Sensor
• Manufacturer: Micron

Valid Data Signals Options
LINE_VALID Signal
Figure 21: LINE_VALID Formats
Integration Time
PDF: 814eb99f/Source: 8175e929
MT9V012_2.fm - Rev. B 2/05 EN
with default settings:
Overhead Time
Shutter Delay
Row Time
where:
t
t
INT
INT
= Reg0x09 * Row Time - Integration Overhead - Shutter Delay
= (Reg0x04 + HBLANK_REG) * PIXCLK_PERIOD master clock periods from Table 3 on page 12
= 182 master clock periods
= Reg0x0C/2 * PIXCLK_PERIOD master clock periods
= (509 * 884 * 2) - 182 - 0
= 899,730 master clock periods
FRAME_VALID
FRAME_VALID
FRAME_VALID
By setting bits 9 and 10 of Reg0x20, the LINE_VALID signal is programmed for three dif-
ferent output formats. The formats shown below illustrate reading out 4 rows and 2 ver-
tical blanking rows (Figure 21).
In the last format, the LINE_VALID signal is the XOR between the continuous
LINE_VALID signal and the FRAME_VALID signal.
Integration time is controlled by Reg0x09 (shutter width, in multiples of the row time)
and Reg0x0C (shutter delay, in PIXCLK_PERIOD/2). Reg0x0C is used to control sub-row
integration times and will only have a visible effect for small values of Reg0x09. The total
integration time,
In this equation, the integration overhead corresponds 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), such that the frame rate is not affected by the integra-
tion time. If Reg0x09 is increased beyond the total number of rows per frame, the sensor
will add additional blanking rows as needed. A second constraint is that
LINE_VALID
LINE_VALID
LINE_VALID
Continuous
Default
XOR
t
INT, is shown in the equation below:
MT9V012 - 1/6-Inch VGA CMOS Digital Image Sensor
36
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©2004 Micron Technology, Inc. All rights reserved.
Feature Description
t
INT must be
Preliminary
‡