Bg BG0836 - Adjust the Gain; Table 15 Exposure Control Register; Table 16 Analog Gain Control Registers; Table 17 Digital Gain Control Registers

V1.2
BG0836 1/2.7 inch 1080P HD CMOS image sensor
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Table 15 Exposure control register
Name
Address
Width
Function
TEXP_H
0x000c
8
Bit[15:8] of Exposure length control
register (row as unit)
TEXP_L
0x000d
8
Bit[7:0] of Exposure length control
register (row as unit)
TEXP_MCK_H
0x0026
8
Bit[15:8] of Exposure length control
register (main clock as unit)
TEXP_MCK_L
0x0027
8
Bit[7:0] of Exposure length control
register (main clock as unit)
The default of the TEXP is 0x0032, the default of the TEXP_MCK is 0x0000. If incoming
frequency is 27 MHZ, exposure time is:
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TEXP and TEXP_MCK registers are written, 0x001d register need to write 0x01 or
0x02.
Adjust the gain
BG0805 has two stages of gain, including analog gain and digital gain.
The analog gain control register：
Table 16 Analog gain control registers
Name
Address
Width
Function
VREFL
0x00b1
8
Analog gain control
Digital gain can be controlled by the above register is
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
Default 

is zero. In normal case, please adjust analog gain by 

. 

has
minimum limit practically. Please Insure 

is equal or larger than 0x0c；
Digital gain control register is ：
Table 17 Digital gain control registers
Name
Address
Width
Function
DIG_GAIN_H
0x00bc
4
Bit[11:8] of digital gain control
DIG_GAIN_L
0x00bd
8
Bit[7:0] of digital gain control
Digital gain control register is DIG_GAIN, 0 x0200 is 1 times digital gain. That is to say
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
 .
In conclusion, the overall gain is:
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