LUPA-4000_07 Datasheet, PDF (24/38 Pages) Cypress Semiconductor – 4M Pixel CMOS Image Sensor

LUPA-4000
Serial-Parallel-Interface (SPI)
The SPI is required to upload the different modes. Table 15
shows the parameters and there bit position
Table 15. SPI parameters
Parameter
Y-direction
Y-address
X-voltage averaging enable
X-subsampling
X-direction
X-address
Nr output amplifiers
DAC
0
1-10
11
12
13
14-23
24
25-31
Bit nr.
Remarks
1: from bottom to top
Bit 1 is LSB
1: Enabled
1: Subsampling
0: From left to right
Bit 14 is LSB
0: 1 Output
Bit 25 is LSB
When all zeros are loaded into the SPI, the sensor will start at
pixel 0,0. The scanning will be from left to right and from top to
bottom. There will be no sub-sampling or voltage averaging
and only one output is used. The DAC will have the lowest
level at its output.
When using sub sampling, only even X-addresses may be
applied.
Figure 21. SPI block diagram and timing
Load_addr
To sensor
D
Q
C
Spi_in
Clock_spi
D
Q
C
Unity Ce ll
Bit 31
32 outputs to sensor
Bit 0
spi_in
Clock_spi
Load_addr
Entire uploadable block
Clock_spi
spi_in
Load_addr
B0
B1
B2
B31
command
applied to
sensor
Document Number: 38-05712 Rev. *B
Page 24 of 38