IBIS4-6600_09 Datasheet, PDF (17/35 Pages) Cypress Semiconductor – 6.6 MP CMOS Image Sensor

IBIS4-6600 CYII4SM6600AB
Table 9. NDR: Advantages and Disadvantages
Advantages
Disadvantages
Low Noise, because it is true CDS. In the order of 10 e- or below. System memory required to record the reset level and the
intermediate samples.
High Sensitivity, because the conversion capacitance is kept rather Requires multiples readings of each pixel, thus higher data
low.
throughput.
High Dynamic Range, because the results include signals for short Requires system level digital calculations.
and long integrations times.
Sequencer and Registers
Figure 4 on page 6 showed several control signals that are
needed to operate the sensor in a particular sub sampling mode,
with a certain integration time, output amplifier gain, and more.
Most of these signals are generated on-chip by the sequencer
that uses only a few control signals. These control signals must
be generated by the external system:
■ SYS_CLOCK, which defines the pixel rate (nominal 40 MHz),
■ Y_START pulse, which indicates the start of a new frame,
■ Y_CLOCK, which selects a new row and starts the row blanking
sequence, including the synchronization and loading of the
X-register.
The relative position of the pulses is determined by a number of
data bits that are uploaded in internal registers through a Serial
to Parallel interface (SPI).
Internal Registers
Table 10 lists the internal registers with a short description. The
registers are discussed in more detail in the following sections.
Table 10. List of Internal Registers
Register Bit
0 (0000) 11:0
0
1:2
3
4
5
6
7
8
9
10
11
1 (0001) 10:0
Name
Description
SEQUENCER
register
Selection of mode, granularity of the X sequencer clock, calibration,
Default value <11:0>:"000100000000"
NDR
Mode of readout:
NDR = 0: normal readout (double sampling)
NDR = 1: non-destructive readout
NDR_mode
4 different modes of nondestructive readout (no influence if NDR = 0)
RESET_BLACK
0 = normal operation
1 = reset of pixels before readout
FAST_RESET
0 = electronic shutter operation
1 = addressing from both sides
FRAME_CAL_MODE 0 = fast
1 = slow
LINE_CAL_MODE 0 = fast
1 = slow
CONT_CHARGE
0 = normal mode
1 = continuous precharge
GRAN_X_SEQ_LSB Granularity of the X sequencer clock
GRAN_X_SEQ_MSB
BLACK
0 = normal mode
1 = disconnects column amplifiers from buses, output of amplifier equals dark
reference level
RESET_ALL
0 = normal mode
1 = continuous reset of all pixels
NROF_PIXELS
Number of pixels to count (X direction). Max. 2222/2 (2210 real + 12 dummy pixels).
Default value <10:0>:"01000000000"
Document Number: 001-02366 Rev. *E
Page 17 of 35
[+] Feedback