PixArt Imaging Inc.
PAS005B
CMOS Image Sensor IC
Figure 2.4 Companding curves program by comp_crv[2:0]
O/P(10b)
1111111111
5
4
3
7
6
withoutcompanding
2
1
0
000xxxxxxx 001xxxxxxx
010
011
10xxxxxxxx
11xxxxxxxx I/P(10b)
3. Register and Function
3.1. Register list
Default
(Decimal)
R/W
Register
Register
Description
I2C sampling frequency = frequency of I_sysclk /
Np_i2c
Reg_2[3:0]
Np_i2c[3:0]
R/W
1
Programming range of Np_i2c: 1~15
Pixel rate = frequency of I_sysclk / Np
Programming range of Np: 1~63
Analog signal processing single or double path
0: double path, 1: single path
Color mode or Mono mode(used only in sub-
sampling mode)
Reg_3[5:0]
Reg_4[7]
Np[5:0]
R/W
R/W
2
0
single_path
Reg_4[6]
cm
R/W
1
0: Mono mode, 1: color mode
reverse read column
0: forward readout, 1: reverse readout
reverse read row
Reg_4[5]
Reg_4[4]
rrc
rrr
R/W
R/W
0
0
0: forward readout, 1: reverse readout
column frequency
00: Normal readout without sub-sampling,
01: 1/2 sub-sampling
10: 1/4 sub-sampling,
11: 1/8 sub-sampling
row frequency
Reg_4[3:2]
Reg_4[1:0]
cf[1:0]
rf[1:0]
R/W
R/W
0
0
00: Normal readout without sub-sampling,
01: 1/2 sub-sampling
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