c15bc1 aptina, c15bc1 Datasheet - Page 44

• Manufacturer Part Number: c15bc1
• Description: Mt9d014 1/4-inch 2mp Cmos Digital Image Sensor
• Manufacturer: aptina

Gain Code Mapping
PDF: 0526161444/Source:6112702771
MT0D014_DS - Rev. J 5/10 EN
As a result of the 2X gain stage, many of the possible gain settings can be achieved in two
different ways. For example, red_gain = 0x90 provides the same gain as red_gain = 0x20.
The first example uses the 2X gain stage and the second example does not. In all cases,
the preferred setting is the setting that enables the 2X gain stage, because this will result
in lower noise.
The Aptina Imaging gain model maps directly to the underlying structure of the gain
stages in the analog signal chain. When the SMIA gain model is used, gain codes are
translated into equivalent settings in the Aptina Imaging gain model.
When the SMIA gain model is in use and values have been written to the
analogue_gain_code_<color> registers, the associated value in the Aptina Imaging gain
model can be read from the associated <color>_gain register. In cases where there is
more than one possible mapping, the 2X gain stage is enabled to provide the mapping
with the lowest noise.
When the Aptina Imaging gain model is in use and values have been written to the
gain_<color> registers, data read from the associated analogue_gain_code_<color>
register is undefined. The reason for this is that many of the gain codes available in the
Aptina Imaging gain model have no corresponding value in the SMIA gain model.
The result is that the two gain models can be used interchangeably, but having written
gains through one set of registers, those gains should be read back through the same set
of registers.
44
MT9D014: 1/4-Inch 2Mp CMOS Digital Image Sensor
Aptina reserves the right to change products or specifications without notice.
©2007 Aptina Imaging Corporation. All rights reserved.
Preliminary
Features