MT9V112 Datasheet, PDF (45/58 Pages) Micron Technology – SOC VGA DIGITAL IMAGE SENSOR

PRELIMINARY
MT9V112
SOC VGA DIGITAL IMAGE SENSOR
Turning Frame Rates
Actual frame rates can be tuned by adjusting various
sensor parameters. The sensor registers are in address
page 0, some of which are shown in Table 13.
Table 13: Register Address Functions
REGISTER
R0x04:0
R0x03:0
R0x07:0, R0x05:0
R0x08:0, R0x06:0
FUNCTION
Column width, typically 640 in the
MT9V112
Row width, typically 480 in the
MT9V112
Horizontal blanking, default is 203
(units of sensor pixel clocks)
Vertical blanking, default is 11
(rows including black rows)
Default Blanking Calculations
The MT9V112 default blanking calculations are
shown in Table 14.
Table 14: Blanking Parameter Calculations
PARAMETER
PC_PERIOD Sensor Pixel Clock Period
A: Active Data Time (per line): R0 x 04:0 + 8 (border) * PC_PERIOD
Q: Horizontal Blanking: [R0 x 05:0 | R0 x 07:0] * PC_PERIOD
Row Time = Q + A
P: Frame Start / End Blanking: 6 * PC_PERIOD
V: Vertical Blanking: [R0 x 06:0 | R0 x 08:0] * (Q + A) + (Q - 2 * P)
F: Total Frame Time: (R0 x 03:0 + [R0 x 06:0 | R00 x 08:0]) * (Q + A)
In the MT9V112, the sensor core adds four border
pixels all the way around the image, taking the active
image size to 648 x 488 in full power mode. This is
achieved through the default settings:
• oversize and show border bits are set by default
• oversize and show border bits are not context
switchable, and therefore, their location is only in
read mode context B.
CALCULATION
(2/24)µs = 0.083µs
648 x (2/24) = 53.784µs
154 x (2/24) = 12.782µs
66.566µs
6 x (2/24) = 0.5µs
(11 x 66.566) + (12.782 - 1.0) = 744µs
(488 + 11) x 66.566µs = 33216.434µs ≥30 fps
User Blanking Calculations
When calculating blanking for different clock rates,
minimum values for horizontal blanking and vertical
blanking must be taken into account. Table 15 shows
minimum values for each register.
Table 15: User Blanking Minimum
Values
PARAMETER
MINIMUM
Horizontal Blanking 132 (sensor pixel clocks)
Vertical Blanking 6 + Reg0x22:0[2:0] rows
09005aef8154a39d/09005aef8175e6cc
MT9V112_2.fm- Rev. A 1/05 EN
45
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