LUPA-4000 Datasheet, PDF (35/49 Pages) Cypress Semiconductor – 4M Pixel CMOS Image Sensor

LUPA-4000
Data Sheet
4.3 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
Bit nr.
0
1-10
11
12
13
14-23
24
25-31
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.
Load_addr
To sensor
D
Q
C
Spi_in
Clock_spi
D
Q
C
Unity Ce ll
Bit 31
spi_in
Clock_spi
Load_addr
32 outputs to sensor
Entire uploadable block
Clock_spi
spi_in
Load_addr
B0
B1
B2
Figure 20: SPI block diagram and timing
Bit 0
B31
command
applied to
sensor
Cypress Semiconductor Corporation
3901 North First Street
San Jose, CA 95134
408-943-2600
Contact: [e-mail] Document #: 38-05712 Rev.**(Revision 1.2 )
Page 35 of 49