PixArt Imaging Inc.

PAS005B

CMOS Image Sensor IC

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PixArt Imaging Inc.

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:

Register

Register

R/W

Default

(Decimal)

Description

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[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

10: 1/4 sub-sampling,

11: 1/8 sub-sampling

Reg_5[2:0]

wcp_in[10:8]

R/W

0

window column pointer

Reg_6[7:0]

wcp_in[7:0]

R/W

0

window column pointer

Reg_7[2:0]

wcw_in[10:8]

R/W

1287

window column width

Reg_8[7:0]

wcw_in[7:0]

R/W

1287

window column width

Reg_9[2:0]

wrp[10:8]

R/W

0

window row pointer