MCM20027IBBL View Datasheet(PDF) - Motorola => Freescale

Part Name

Description

Manufacturer

MCM20027IBBL

Color SXGA Digital Image Sensor 1280 x 1024 pixel progressive scan solid state image sensor with integrated CDS/PGA/ADC, digital programming, control, timing, and pixel correction features

Motorola => Freescale 

MOTOROLA

SEMICONDUCTOR TECHNICAL DATA

ImageMOS

6.3 SFRS Frame Time/Rate:

In Single Frame Rolling Shutter capture mode the Frame

time is defined as:

Frame time = Tframe= Integration time+Readout time

Readout time is the amount of time to readout the data af-

ter integration of the row has been completed. It is defined

as follows:

Readout time = (vrdd + 1) * Trow

where vrdd defines the number of rows in the virtual

frame. The user controls vrdd via the CFRS Virtual Frame

Row Depth registers (Table 44 on page 55 and Table 45

on page 55).

Trow = (vcwd + shsd + shrd + 19) * MCLKperiod

For Integration time see “Integration Time in SFRS

mode” on page 14

6.3.1 Integration Time in SFRS mode

The Integration time in Single Frame Rolling Shutter cap-

ture mode is the same as in Rolling Shutter Capture

Mode. For further information, see “Integration Time in

CFRS mode:” on page 13. The only difference is that

in this mode the Integration time is NOT bounded by

the Frame time

6.4 Example of Frame time/rate and Integration Time

in CFRS and SFRS modes

The following illustrates how to determine the Frame time/

rate and Integration time in both capture modes:

Assumptions:

1) Active Window of Interest = 1280 x 1024

i.e.. (wcwd)=1279

(wrdd)=1023

2) Virtual Column Width (vcwd)= 1290

3) Virtual Row Depth (vrdd) = 1034

4) Sample & hold time (shsd) = 10

5) Sample & hold time (shrd) = 10

6) Integration Time (cintd)= 350

7) MCLK = 13.5 Mhz

NOTE!! vcwd and cintd are typically varied frame to

frame

Calculations:

Row Time =Trow = (vcwd + shsd + shrd + 19)

= (1290 + 10 + 10 + 19) / 13.5e6

= 98.44µs

Integration Time = (cintd + 1) * Trow

=(350+1)*98.44µs

=34.5ms

Readout time = (vrdd + 1) * Trow

= Frame time in CFRS mode

Frame Time in CFRS mode = (vrdd + 1) * Trow

Tframe =(1034 + 1)* 98.44

= 101.34 ms

Frame Time in SFRS mode =

Tframe = Integration time+Readout time

= 34.5ms + 101.34ms

= 135.84ms

Results

Capture Mode

CFRS

SFRS

Tint

34.5ms

34.5ms

Tframe

101.34 ms

135.84ms

NOTE!! CFRS Integration time = 34.5ms because:

Tint < Tframe = (vrdd + 1) * Trow

(see “Integration Time in CFRS mode:” on page 13)

MOTOROLA

Revision 8.4 - 24 Oct 2002 : MCM20027

14

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