NOII5SM1300A
Table 15. INTERNAL REGISTERS
8 (1000)
9 (1001)
10 (1010)
11 (1011)
12 (1100)
13 (1101)
14 (1110)
15 (1111)
6
6:0
6:0
2:0
0
1
2
STANDBY
DACRAW_REG
DACFINE_REG
ADC register
TRISTATE_OUT
GAMMA
BIT_INV
Reserved
Reserved
Reserved
Reserved
0 = Amplifier in standby mode
Amplifier DAC raw offset
Default value <6:0>: ‘1000000’
Amplifier DAC fine offset
Default value <6:0>: ‘1000000’
Default value <2:0>: ‘011’
0 = Output bus in tri-state
0 = Gamma-correction on
1 = Bit inversion on output bus
Detailed Description of Internal Registers
Sequencer register (7:0)
1. Shutter type (bit 0)
The IBIS5-1300 image sensor has two shutter types:
0 = synchronous shutter
1 = rolling shutter
2. Output amplifier calibration (bits 1 and 2)
Bits FRAME_CAL_MODE and
LINE_CAL_MODE define the calibration mode of the
output amplifier.
During every row-blanking period, a calibration is
done of the output amplifier. There are two calibration
modes. The FAST mode (0) forces a calibration in one
combined into one pixel stream at the same frequency
as SYS_CLOCK.
Use the bits GRAN_SS_SEQ_MSB (bit 7) and
GRAN_SS_SEQ_LSB (bit 6) to program the clock that
drives the ‘snapshot’ or synchronous shutter sequencer.
This way the integration time in synchronous shutter
mode is a multiple of 32, 64, 128, or 256 times the
system clock period. To overcome global reset issues,
use the longest SS granularity (bits 6 and 7 set to ‘1’).
Table 16. SS SEQUENCER CLOCK GRANULARITIES
GRAN_SS_SEQ_MSB/ SS-Sequencer Clock Integration
LSB Time Step [1]
cycle but is not so accurate and suffers from KTC noise.
The SLOW mode (1) only makes incremental
adjustments and is noise free.
Approximately 200 or more slow calibrations
have the same effect as one fast calibration.
00
01
10
11
32 x SYS_CLOCK
64 x SYS_CLOCK
128 x SYS_CLOCK
256 x SYS_CLOCK
800 ns
1.6 m s
3.2 m s
6.4 m s
Different calibration modes are set at the beginning of
the frame (FRAME_CAL_MODE bit) and for every
subsequent line that is read (LINE_CAL_MODE bit).
The Y_START input defines the beginning of a frame,
Y_CLOCK defines the beginning of a new row.
3. Continuous charge (bit 3)
Some applications may require the use continuous
charging of the pixel columns instead of a pre-charge on
every line sample operation.
Setting bit CONT_CHARGE to ‘1’ activates this
function. The resistor connected to pin PC_CMD
controls the current level on every pixel column.
4. Internal clock granularities (bits 4, 5, 6 and 7)
1. Using a SYS_CLOCK of 40 MHz (25 ns period).
The clock that drives the X-sequencer is a multiple of 4,
8, 16, or 32 times the system clock. Clocking the
X-sequencer at a slower rate (longer row blanking time;
pixel read out speed is always equal to the
SYSTEM_CLOCK) results in more signal swing for the
same light conditions.
Table 17. X SEQUENCER CLOCK GRANULARITIES
GRAN_X_SEQ_MSB/ X-Sequencer Clock Integration
LSB Time Step [1]
00 4 x SYS_CLOCK 100 ns
The system clock is divided several times on-chip.
Half the system clock rate clocks the X-shift-register
that controls the column/pixel readout. Odd and even
pixel columns are switched to two separate buses. In the
01
10
11
8 x SYS_CLOCK
16 x SYS_CLOCK
32 x SYS_CLOCK
200 ns
400 ns
800 ns
output amplifier, the pixel signals on the two buses are
1. Using a SYS_CLOCK of 40 MHz (25 ns period).
http://onsemi.com
17
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