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NOIL1SM4000A

LUPA4000: 4 MegaPixel High Speed CMOS Sensor

ON Semiconductor 

NOIL1SM4000A

• Spi_load (AH[10]): When the SPI register is uploaded,

then the data is internally available on the rising edge of

SPI_load.

• Sh_kol (AL[11]): Control signal of the column readout.

It is used in sample and hold mode and binning mode.

• Norowsel (AH[10]): Control signal of the column

readout (see Timing and Readout of Image Sensor).

• Pre_col (AL[11]): Control signal of the column readout

to reduce row blanking time.

• Voltage averaging (AH[10]): Signal required obtaining

voltage averaging of two pixels.

NOTES: 10. AH: Active High

11. AL: Active Low

Test Signals

The test structures implemented in this image sensor are:

• Array of pixels (6 x 12) that outputs are tied together:

used for spectral response measurement.

• Temperature diode (2): Apply a forward current of

10ĂmA to 100 mA and measure the voltage VT of the

diode. VT varies linear with the temperature (VT

decreases with approximately 1.6 mV/°C).

• End of scan pulses (do not use to trigger other signals):

♦ Eos_x: end of scan signal: is an output signal,

indicating when the end of line is reached. It is not

generated when windowing.

♦ Eos_y: end of scan signal: is an output signal,

indicating when the end of frame is reached. It is not

generated when windowing.

♦ Eos_spi: output signal of the SPI to check if the data

is transferred correctly through the SPI.

Frame Rate and Windowing

Frame Rate

To acquire a frame rate of 15 frames/sec, the output

amplifier should run at 66 MHz pixel rate or two output

amplifiers should run at 33 MHz each, assuming an ROT of

200 ns.

The frame period of the LUPA4000 sensor is calculated as

follows:

Frame period = FOT + (Nr. Lines x (ROT + pixel period

x Nr. Pixels) with:

FOT = 5 ms

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

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

ROT = 200 ns (nominal; can be further reduced)

Pixel period: 1/66 MHz = 15.15 ns

Example read out of the full resolution at nominal speed

(66 MHz pixel rate):

Frame period = 5 ms + (2048 x (200 ns + 15.15 ns x 2048)

= 64 ms ³ 15 fps.

ROI Readout (Windowing)

Windowing is achieved by an SPI in which the starting

point of the x-address and y-address is uploaded. This

downloaded starting point initiates the shift register in the

x-direction and y-direction triggered by the Sync_x and

Sync_y pulse. The minimum step size for the x-address and

the y-address is 2 (only even start addresses can be chosen).

The size of both address registers is 10-bits. For instance,

when the addresses 0000000001 and 0000000001 are

uploaded, the readout starts at line 2 and column 2.

Table 5. FRAME RATE AS FUNCTION OF ROI READ OUT AND SUB SAMPLING

Image Resolution (X*Y)

Frame Rate [frames f/S]

Frame Readout Time [mS]

2048 x 2048

15

67

1024 x 2048

31

32

1024 x 1024

62

16

640 x 480

210

4.7

Comment

Full resolution.

Subsample in X-direction.

ROI read out.

ROI read out.

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