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MT9M131 Folha de dados(PDF) 38 Page - ON Semiconductor

Nome de Peças MT9M131
Descrição Electrónicos  1/3?릋nch SOC 1.3Mp CMOS Digital Image Sensor
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Fabricante Electrônico  ONSEMI [ON Semiconductor]
Página de início  http://www.onsemi.com
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MT9M131 Folha de dados(HTML) 38 Page - ON Semiconductor

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The IFP typically generates up to 16 bits per pixel, for
example YCbCr or 565RGB, but has only an 8-bit port
through which to communicate this pixel data. There is no
phase locked loop (PLL), so the primary input clock
(EXTCLK) must be twice the fundamental pixel rate
(defined by the sensor pixel clock).
To generate SXGA images at 15 fps, the sensor core
requires a clock in the 24 to 27 MHz range; this is also the
fundamental pixel clock rate (sensor pixel clock) for
full-power operation. To achieve this pixel rate, EXTCLK
must be in the 48 to 54 MHz range. The device defaults
assume a 54 MHz clock. Minimum clock frequency is
2 MHz.
Primary Operating Modes
The MT9M131 supports two primary modes of operation
with respect to the sensor core that affect pixel rate, frame
rate, and blanking.
Full-Power Readout Mode
The sensor is in full resolution mode, generating
1.3 megapixels (SXGA = 1,280
× 1,024 + border) for
interpolation. The SXGA image fed from the sensor to the
colorpipe can be resized in the colorpipe, but the frame rate
is still defined by sensor core operation. In full-power
readout mode, with full FOV, the frame rate is invariant with
the final image size:
Context
Typically Context B
Sensor Read Mode
Settings
No Skipping
Full-power Readout, that is, Full
Data Rate
Sensor Pixel Clock
27 MHz for 54 MHz Master Clock:
Maximum Pixel Rate of
27 Megapixels per Second
Maximum Frame Rate
For 54 MHz Master Clock, 15 fps
Low-Power Readout Mode
Running under low-power readout, the sensor is in skip
mode, and generates QSXGA frames (640
× 512 + border =
336,960 pixels). This full FOV QSXGA image can be
resized, but only to resolutions smaller than QSXGA.
The frame rate is defined by the operating mode of the
sensor:
Context
Typically Context A
Sensor Read Mode
Settings
Row Skip 2
×
Column Skip 2
×
Low-power Readout Maximum Data
Rate is Half that of Full-power
Readout
Sensor Pixel Clock
13.5 MHz for 54 MHz Master Clock:
Maximum Pixel Rate of
13.5 Megapixels per Second
Maximum Frame Rate
For 54 MHz Master Clock, 30 fps
Tuning Frame Rates
Actual frame rates can be tuned by adjusting various
sensor parameters. The sensor registers are in page 0, thus
the “0” at the beginning of each register address:
Table 14. REGISTER ADDRESS FUNCTIONS
Register
Function
R0x004
Window width, typically 1280 in the MT9M131
R0x003
Window height, typically 1024 in the MT9M131
LOW-POWER READOUT MODE − CONTEXT A
R0x007
Horizontal blanking, default is 190 (units of sensor pixel clocks)
R0x008
Vertical blanking, default is 17 (rows including black rows)
FULL-POWER READOUT MODE − CONTEXT B
R0x005
Horizontal blanking, default is 388 (units of sensor pixel clocks)
R0x006
Vertical blanking, default is 42 (rows including black rows)
In the MT9M131, the sensor core adds 4 border pixels all
the way around the image, taking the active image size to
1288
× 1032 in full-power snapshot resolution, and
648
× 520 when skipping rows in low-power preview
resolution. This is achieved through the default settings:
Read mode context B: R0x020
Oversize and show border bits are set by default
Oversize and show border bits are not context
switchable, thus their location only in read mode
context B
Default Blanking Calculations
The MT9M131 default blanking calculations are
a function of context, as follows:
[REG<a> | REG<b>]:
Reg<a>
Low-power readout = context A, typically used for
viewfinder
Reg<b>
Full power readout = context B, typically used for
snapshots


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