VS6502V015/T2 STMicroelectronics, VS6502V015/T2 Datasheet - Page 16

• Manufacturer Part Number: VS6502V015/T2
• Description: SENSOR COLOR VGA CMOS SMOP
• Manufacturer: STMicroelectronics
• Type: CMOS Imagingr

Specifications of VS6502V015/T2

• Pixel Size: 5.6µm x 5.6µm
• Active Pixel Array: 644H x 484V
• Frames Per Second: 30
• Voltage - Supply: 2.6 V ~ 3.6 V
• Package / Case: SMOP2
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-3884-1

Functional Description
2.3.11 Gain timing and exposure updates
16/48
Example of exposure calculation in default VGA video mode
coarse exposure = 522
fine exposure = 762
Input clock frequency - Fclkin = 24MHz,
Pixel period = 2/(24 x 10
Calculation: exposure time = 8.33 x10
The available range of exposure (without using clock division) is shown in
Exposure and gain values are re-timed within the sensor to ensure that a new set of values is only
applied to the sensor array at the start of each frame. The status register [2] shows is set high when
a new exposure value is written via the serial interface but has not yet been applied to the sensor
array.
There is a 1 frame latency between a new exposure value being applied to the sensor array and the
results of the new exposure value being read-out. The same latency does not exist for the gain
value. To ensure that the new exposure and gain values are aligned up correctly the sensor delays
the application of the new gain value by one frame relative to the application of the new exposure
value.
Frame length
Line length
Exposure
Coarse exposure
value
Fine exposure
value
Pixel period
Exposure time
Min.
Max (default-VGA)
Max (available)
Range
Number of lines per frame [default=524]
The frame length may be increased to 1023 by writing to the frame length register.
Number of pixels in a line [default = 762]
The line length may be increased to 1023 by writing to the line length register.
The pixel exposure time is determined by the course and fine exposure values
The number of lines a pixel exposes for.
Limited by frame length.
Coarse exposure value is in the range [0 - (frame length -2)].
Number of additional pixel periods a pixel exposes for.
Limited by line length.
Fine exposure value is in the range [11 - (line length)].
Determined by the input clock frequency (Fclkin) and user clk_div setting.
PixPeriod=(2*N)/Fclkin where N = clock divider ratio
PixPeriod x [(Coarse
Table 6: Exposure ranges [24MHz system clock]
(no. lines)
6
) = 8.33 x10
Coarse
1023
522
Table 5: Definitions related to exposure
0
-8
-8
Line length
(no. pixels)
s
x [(522 x 762) +762] = 33.2 ms
num_lines
1023
762
762
x Line_Length
(no. pixels)
1023
Fine
762
11
num_pixels
) + Fine
1023
No. pixels
400,050
Table
2
0
+ 1023
pixels
Exposure
6.
]
33.2 ms
87.3 ms
0.92 µs
VS6502
Time