CYIH1SM1000AA-HHCS Cypress Semiconductor Corp, CYIH1SM1000AA-HHCS Datasheet - Page 69

• Manufacturer Part Number: CYIH1SM1000AA-HHCS
• Description: IC SPACE IMAGE SENSOR 84-JLCC
• Manufacturer: Cypress Semiconductor Corp

Specifications of CYIH1SM1000AA-HHCS

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

CYIH1SM1000AA-HHCS
Answer:
The pixel-to-pixel crosstalk chown in
“Pixel-to-Pixel Cross Talk”
on page 38. is cross-talk caused by floating generated electrons that
are not yet captured by any photo-diode. So it has nothing to do with the actual level on the accumulated photo-diodes. Only when
the photo-diode is really totally saturated, the floating electrons can behave differently. The saturated photo-diode cannot capture
more electrons, so incoming electrons are not kept. The generated electrons will be captured by neighboring photo-diodes that are
not yet completely saturated (or recombined).
So cross-talk as measured in
“Pixel-to-Pixel Cross Talk”
on page 38 goes both from pixel with higher to lower signal levels and vice
versa. It doesn't matter as long they are not fully saturated. Note that the anti-blooming ground can keep the pixel out of a completely
saturation state.
Question:
The test results after proton beam are not as expected. In order to interpret the results we want to know what the thickness is of the
epitaxial layer. Ore more in detail the thickness of the active area of the photo diode.
Answer:
μ
EPI thickness: 5
m, the nwell is about 1um deep.
Question:
How large is the active area compared to the overall pixel?
Almost the whole photo-sensitive area is active area.
Answer:
96% of the whole pixel is active area. Everything expect the transistors and nwell, is p-doped
Question:
Is there a spice model available for the radiation hard pixel used in the HAS device?
Answer:
No. The models that are used are just non-radiation hard models.
Question:
What is the penetration depth of photons in the HAS2 pixel versus the spectral range? Doe we have such graphs available?
Answer:
This is theory. We have penetration versus spectral range but this depends on the actual doping levels of the substrate. So it is never
actual measured.
Question:
How would the MTF behave with increasing wavelength? Is there an MTF graph available versus spectral range?
Answer:
You can expect a large decrease in MTF when using higher wavelengths. To known how it behaves on the HAS2, new MTF measure-
ments are needed.
Question:
In chapter 6.2 of the actual data sheet it is suggested to use one regulator for all digital supply pins together, one regulator for the
sensor core analogue supplies together, and one regulator for the ADC analogue supply. Against it the test circuit in chapter 7.3 uses
5 different supply voltages (VDDD, VDDA, VPIX, VadcA, VadcD).
With the first information I decided to use 3 regulators: One for VDD_ANA + VDD_PIX, one for VDD_DIG + VDD_ADC_DIG and one
only for VDD_ADC_ANA. Moreover I use two grounds (analog and digital). Sadly with this configuration I have some problems in
Window-Mode. Every 2nd line of the first lines of a window overshoot there. The more lines are sampled the lower is that effect. After
may be 20 to 30 lines the effect exists no longer. In an other PCB I use a separate regulator for VDD_PIX instead for VDD_ADC_ANA
(VDD_ADC_ANA is connected to VDD_ANA) and everything works fine. Could that may be the problem or do you have any other
ideas?
Answer:
I expect that the peak currents of VPIX make the power regulator that you use unstable. This is no problem as long the VPIX isn't use
by other parts of the sensor.
So it is normal that when VPIX has its own regulator, nothing strange becomes visible in the image. But probably, VPIX is still not
stable. However, the double sampling (both the signal and the black level are affected by the voltage level of VPIX) hide the problem
for you.
Document Number: 001-54123 Rev. *A
Page 69 of 71
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