NOII5SM1300A-QDC【PDF 20/33 页】SENSOR IMAGE MONO CMOS 84-LCC

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NOII5SM1300A

P_WRITE loads the parallel data into the internal register of

the IBIS5-1300 where it is decoded (see Figure 19).

P_DATA (15:12) address bits REG_ADDR (3:0); P_DATA

(11:0) data bits REG_DATA (11:0).

Serial 3-Wire Interface

The serial 3-wire interface (or serial-to-parallel Interface)

uses a serial input to shift the data in the register buffer.

When the complete data word is shifted into the register

buffer the data word is loaded into the internal register where

it is decoded (see Figure 19). S_DATA (15:12) address bits

REG_ADDR (3:0); S_DATA (11:0) data bits REG_DATA

(11:0). When S_EN is asserted the parallel data is loaded

into the internal registers of the sensor. The maximum tested

frequency of S_DATA is 2.5 MHz.) The serial 2-wire

interface is not operational in the IBIS5-1300 image sensor.

Use the 3-wire SPI interface to load the sensor registers.

Figure 19. Parallel Interface Timing

TIMING DIAGRAMS

Frame Rate

The pixel rate for this sensor is high enough to support a

frame rate of greater than 100 Hz for a window size of

640 x 480 pixels (VGA format). Considering a row

blanking time of 3.5 m s (as baseline, see also Internal clock

granularities (bits 4, 5, 6 and 7) on page 17), this requires a

minimum pixel rate of nearly 40 MHz. The final bandwidth

of the column amplifiers, output stage, and others is

determined by external bias resistors. With a nominal pixel

rate of 40 MHz, a full frame rate of a little more than 27

frames per second is obtained.

The frame period of the IBIS5-1300 sensor depends on the

shutter type.

Rolling Shutter

=> Frame period = (Nr. Lines * (RBT + pixel period * Nr.

Region-of-Interest (ROI) Read Out

Windowing is easily achieved by uploading the starting

point of the X- and Y-shift registers in the sensor registers

using the various interfaces. This downloaded starting point

initiates the shift register in the X- and Y-direction triggered

by the Y_START (initiates the Y-shift register) and the

Y_CLK (initiates the X-shift register) pulse. The minimum

step size for the x-address is two (only even start addresses

are chosen) and one for the Y-address (every line is

addressable). The frame rate increases almost linearly when

fewer pixels are read out. Table 20 gives an overview of the

achievable frame rates (in rolling shutter mode) with various

ROI dimensions.

Table 20. FRAME RATE VS. RESOLUTION

Pixels))

with:

Nr. Lines Number of lines read out each frame (Y)

Nr. Pixels Number of pixels read out each line (X)

RBT Row blanking time = 3.5 m s (typical)

Pixel period 1/40 MHz = 25 ns

Example Read out time of the full resolution at nominal

Image

Resolution

(X x Y)

1280 x 1024

640 x 480

100 x 100

Frame Rate

[frames/s]

27

100

1657

Frame

Readout Time

[ms]

36

10

0.6

Comment

Full resolution.

ROI read out.

ROI read out.

speed (40 MHz pixel rate):

Frame period = (1024 * (3.5 m s + 25 ns * 1280)) = 36.4 ms

= 27.5 fps

Global shutter

Frame period = Tint + Tread out

= Tint + (Nr. Lines * (RBT + pixel period * Nr. Pixels))

with: Tint Integration (exposure) time

Nr. Lines Number of lines read out each frame (Y)

Nr. Pixels Number of pixels read out each line (X)

RBT Row blanking time = 3.5 m s (typical)

Pixel period 1/40 MHz = 25 ns

Example Read out time of the full resolution at nominal

speed (40 MHz pixel rate) with an integration time of 1 ms:

Frame period = 1 ms + (1024 * (3.5 m s + 25 ns * 1280))

= 37.4 ms = 26.8 fps

Timing Requirements

There are six control signals that operate the image sensor:

? SS_START

? SS_STOP

? Y_CLOCK

? Y_START

? X_LOAD

? SYS_CLOCK

The external system generates these control signals with

following time constraints to SYS_CLOCK (rising edge =

active edge):

T SETUP >7.5 ns

T HOLD > 7.5 ns

It is important that these signals are free of any glitches.

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