PixArt Imaging Inc.

PAS005B

CMOS Image Sensor IC

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PixArt Imaging Inc.

Figure 2.4 Companding curves program by comp_crv[2:0]

3. Register and Function

3.1. Register list

Register

Register

R/W

Default

(Decimal)

Description

Reg_2[3:0]

Np_i2c[3:0]

R/W

1

I2C sampling frequency = frequency of I_sysclk /

Np_i2c

Programming range of Np_i2c: 1~15

Reg_3[5:0]

Np[5:0]

R/W

2

Pixel rate = frequency of I_sysclk / Np

Programming range of Np: 1~63

Reg_4[7]

single_path

R/W

0

Analog signal processing single or double path

0: double path, 1: single path

Reg_4[6]

cm

R/W

1

Color mode or Mono mode(used only in sub-

sampling mode)

0: Mono mode, 1: color mode

Reg_4[5]

rrc

R/W

0

reverse read column

0: forward readout, 1: reverse readout

Reg_4[4]

rrr

R/W

0

reverse read row

0: forward readout, 1: reverse readout

Reg_4[3:2]

cf[1:0]

R/W

0

column frequency

00: Normal readout without sub-sampling,

01: 1/2 sub-sampling

10: 1/4 sub-sampling,

11: 1/8 sub-sampling

Reg_4[1:0]

rf[1:0]

R/W

0

row frequency

00: Normal readout without sub-sampling,

01: 1/2 sub-sampling

I/P(10b)

010

10xxxxxxxx

11xxxxxxxx

001xxxxxxx

011

without companding

3

000xxxxxxx

2

0

6

O/P(10b)

1111 1111 11

4

5

7

1