AR0331_17 datasheet(19/52 Pages) ONSEMI

Part #	AR0331

Description	AR0331 1/3?륤nch 3.1 Mp/Full HD Digital Image Sensor

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Manufacturer	ONSEMI [ON Semiconductor]

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AR0331

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19

Table 8.

RECOMMENDED SENSOR GAIN

coarse_gain(0x3060[5:4])/

coarse_gain_cb (0x3060[13:12])

fine_gain (0x3060[3:0])/

fine_gain_cb (0x3060[11:8])

ADC Gain

0

6

1.23

0

7

1.28

0

8

1.34

0

9

1.39

0

10

1.45

0

11

1.52

0

12

1.60

0

13

1.69

0

14

1.78

0

15

1.88

1

0

2.00

1

2

2.14

1

4

2.28

1

6

2.47

1

8

2.67

1

10

2.91

1

12

3.20

1

14

3.56

2

0

4

2

4

4.56

2

8

5.34

2

12

6.41

3

0

8

Each digital gain can be configured from a gain of 0 to

15.992. The digital gain supports 128 gain steps per 6dB of

gain. The format of each digital gain register is

“xxxx.yyyyyyy” where “xxxx” refers an integer gain of 1 to

15 and “yyyyyyy” is a fractional gain ranging from 0/128 to

127/128.

The sensor includes a digital dithering feature to reduce

quantization noise resulting from using digital gain. It can be

disabled by setting R0x30BA[5] to 0. The default value is 1.

PEDESTALS

There are two types of constant offset pedestals that may

be adjusted at the end of the datapath.

The data pedestal is a constant offset that is added to pixel

values at the end of the datapath. The default offset when

ALTM is disabled is 168 and is a 12-bit offset. This offset

matches the maximum range used by the corrections in the

digital readout path. The purpose of the data pedestal is to

convert negative values generated by the digital datapath

into positive output data. It is recommended that the data

pedestal be set to 16 when ALTM is enabled.

The data pedestal value can be changed from its default

value by adjusting register R0x301E.

The ALTM pedestal (R0x2450) is also located at the end

of the datapath. The ALTM pedestal default offset is 0.

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