PixArt Imaging Inc.
PAS005B
CMOS Image Sensor IC
writing the registers followed by setting “flag” register to 1. Registers 4 ~ 15 are some critical registers that
influent the sensor cell array. If the readout pixels aare changed, register 16(mode_chg_reg) should be set to 1
to reset the full array. So the programming sequence is writing the registers, set mode_chg, than set flag. If
mode_chg_ena register is 1, these registers will be protected unchanged till setting mode_chg followed by
setting flag.
4.7 Exposure Programming
The Exposure Time calculation of PAS005 is based on the following sequence:
1. System clk
2. Pxclk
3. Frame rate
4. Exposure time
5. Equivalent exposure line and pixel number
6. Register (Ny)offset_ny,(Ne) offset_ne
For a given Sysclk, pxclk and EX-time:
Np = Sysclk / pxclk.
The Exposure Time calculation of PAS005 is based on the following Register:
Default
(Decimal)
R/W
R/W
R/W
Register
Register
Np[5:0]
Description
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]
2
Reg_4[7]
Reg_4[6]
single_path
cm
0
1
R/W
R/W
0: Mono mode, 1: color mode
column frequency
00: Normal readout without sub-sampling,
01: 1/2 sub-sampling
10: 1/4 sub-sampling,
Reg_4[3:2]
Reg_4[1:0]
cf[1:0]
rf[1:0]
0
0
11: 1/8 sub-sampling
row frequency
00: Normal readout without sub-sampling,
01: 1/2 sub-sampling
R/W
10: 1/4 sub-sampling,
11: 1/8 sub-sampling
Reg_5[2:0]
Reg_6[7:0]
Reg_7[2:0]
Reg_8[7:0]
Reg_9[2:0]
wcp_in[10:8]
wcp_in[7:0]
wcw_in[10:8]
wcw_in[7:0]
wrp[10:8]
R/W
R/W
R/W
R/W
R/W
0
0
1287
1287
0
window column pointer
window column pointer
window column width
window column width
window row pointer
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PixArt Imaging Inc.
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