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

BG0836 1/2.7 inch 1080P HD CMOS image sensor
Name
TEXP_H
TEXP_L
TEXP_MCK_H
TEXP_MCK_L

Adjust the gain

Name
VREFL
Name
DIG_GAIN_H
DIG_GAIN_L

Table 15 Exposure control register

Address
0x000c
0x000d
0x0026
0x0027
The default of the TEXP is 0x0032, the default of the TEXP_MCK is 0x0000. If incoming
frequency is 27 MHZ, exposure time is:
TEXP and TEXP_MCK registers are written, 0x001d register need to write 0x01 or
0x02.
BG0805 has two stages of gain, including analog gain and digital gain.
The analog gain control register：

Table 16 Analog gain control registers

Address
0x00b1
Digital gain can be controlled by the above register is
Gain
Default �� is zero. In normal case, please adjust analog gain by ��
������ℎ
minimum limit practically. Please Insure ��
Digital gain control register is ：

Table 17 Digital gain control registers

Address
0x00bc
0x00bd
Digital gain control register is DIG_GAIN, 0 x0200 is 1 times digital gain. That is to say
In conclusion, the overall gain is:
Width
8 Bit[15:8] of Exposure length control
register (row as unit)
8 Bit[7:0] of Exposure length control
register (row as unit)
8 Bit[15:8] of Exposure length control
register (main clock as unit)
8 Bit[7:0] of Exposure length control
register (main clock as unit)
Texp = ( 50 ∗ 4808 + 0 ) ∗ Tmclk
Width
8 Analog gain control
= 128 (vrefl + 1)
⁄
analog
��������
Width
4 Bit[11:8] of digital gain control
8 Bit[7:0] of digital gain control
Gain = Dig_Gain/ 512.
digital
�������� = ��������
������ ������������
19/ 24
Function
Function
is equal or larger than 0x0c；
Function
∗ ��������
��������������
V1.2
. ��
has
�������� ������ℎ