MT9V024 Datasheet, PDF (28/62 Pages) ON Semiconductor – Wide-VGA CMOS Digital Image Sensor

MT9V024: 1/3-Inch Wide-VGA Digital Image Sensor
Feature Description
On-Chip Biases
ADC Voltage Reference
The ADC voltage reference is programmed through R0x2C, bits 2:0. The ADC reference
ranges from 1.0V to 2.1V. The default value is 1.4V. The increment size of the voltage
reference is 0.1V from 1.0V to 1.6V (R0x2C[2:0] values 0 to 6). At R0x2C[2:0] = 7, the refer-
ence voltage jumps to 2.1V.
It is very important to preserve the correct values of the other bits in R0x2C. The default
register setting is 0x0004. This corresponds to 1.4V—at this setting 1mV input to the ADC
equals approximately 1 LSB.
V_Step Voltage Reference
This voltage is used for pixel high dynamic range operations, programmable from R0x31
through R0x34 for context A, or R0x39 through R0x3B for context B.
Chip Version
Chip version register R0x00 is read-only.
Window Control
Registers column start A/B, row start A/B, window height A/B (row size), and window
width (column size) A/B control the size and starting coordinates of the window.
The values programmed in the window height and width registers are the exact window
height and width out of the sensor. The window start value should never be set below
four.
To read out the dark rows set bit 6 of R0x0D. In addition, bit 7 of R0x0D can be used to
display the dark columns in the image. Note that there are Show Dark settings only for
context A.
Blanking Control
Horizontal blank and vertical blank registers R0x05 and R0x06 (B: 0xCD and R0xCE),
respectively, control the blanking time in a row (horizontal blanking) and between
frames (vertical blanking).
• Horizontal blanking is specified in terms of pixel clocks.
• Vertical blanking is specified in terms of numbers of rows.
The actual imager timing can be calculated using Table 2 on page 9 and Table 3 on
page 10, which describe “Row Timing and FV/LV signals.” The minimum number of
vertical blank rows is 4.
MT9V024_DSRev. G Pub. 4/15 EN
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