VD6640 datasheet(21/126 Pages) STMICROELECTRONICS

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VG6640, VD6640

Functional description

125

Figure 5. Custom analog block (CAB) block diagram

3.1.1

Pixel array

The pixel array consists of:

•

1304 x 980 visible pixels, each of 3.75 µm x 3.75 µm pixel size

•

pixels offer 2 global conversion gain settings with a nominal ratio of

•

dark pixels - used to calibrate the dark current

•

border pixels - required by the algorithms in the HDR video pipe

•

automotive safety integrity level (ASIL) pixels - a synthetic signal source used to

generate stimuli for the analog signal chain which can then be verified by the receiver

of the image

3.1.2

X, Y address

The X and Y addressing blocks address each pixel in the array in turn, to generate video

data. Each pixel integrates the incoming light up to three times, in order to increase the

dynamic range.

3.1.3

Dual column ADCs

The dual column ADCs digitize the analog pixel signal from the pixel array. Analog gain may

be applied to the analog pixel signal before digitization.

3.1.4

Dual SRAM

The dual SRAM stores the pixel values for two integration times until the pixel values for the

third integration time becomes available.

Custom analog block (CAB)

1304 x 980

Column ADC

Power

management

address

Digital

logic

HDR pixels

Column ADC

X address

SRAM readout

Timing signals

Raw sensor data

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