Changes Between the ADV7181B vs the ADV7181C

Hi,

As per expert comment "We don’t have any document regarding the migration from the ADV7181B to the ADV7181C or ADV7181D. Although these are similar pinouts, but these devices are not pin to pin compatible. So it is not a simple drop replacement hardware wise.

There is a noticeable difference in the video image displayed between the Rev B and Rev C
   "The recommended settings are different for these three devices. Again, its quite similar but not identical. So a software update is required when migrating from one to the other"

Details regarding the respective pinouts, packages, register descriptions and recommended scripts can be found on the respective design support files pages.

Thanks,

Poornima

Poornima,  Regarding the Pinout difference, interstingly, the video mode they are using we did a comparison and, although initially it looks like the data doesn't line up, the data is shifted internally so that it does appear to line up in that mode.  The fact that they have been shipping product for a considerable time appears to confirm that.  Additioanlly we did look at the register  comparisons and took that into consideration.  It does seem to boil down to subtle differences in the auto gain settings and how total light of the imager is handled internal to the ADV7181.  In normal operation the ADV7181C appears to work as it should, it is just in certain light conditions, specifically, when a single source of bright light in the captured image (think of a bright flood light in an otherwise dim setting at twilight) the image saturates as where in the "B" version with similar register conditions, it did not affect the entire image.  What we are trying to avoid is a prolonged "Trail and Error" SW effort trying to test different register settings and would like to know if there is a specific register that we should start with.

Thanks, Pau

Hi,

 If possible, Please share the captured picture and register dump.

Thanks,

Poornima

Sure See BelowPDF 

if (setupNTSC)

{

pCamClass->I2C_write(0x1A, 0x11);        

pCamClass->I2C_write(0x1C, 0x1F);        

pCamClass->I2C_write(0x1B, 0xF3);        

pCamClass->I2C_write(0x1D, 0x41);        

pCamClass->I2C_write(0x1F, 0x66);        

pCamClass->I2C_write(0x22, 0x8C);        

pCamClass->I2C_write(0x21, 0x09);        

pCamClass->I2C_write(0x20, 0xD0);

// Remove forced blue screen

pCamClass->I2C_write(0x0C, 0x36);

// Flag last was NTSC

pCamClass->SetNTSCMode(true);

}

else if (setupPAL)

{

pCamClass->I2C_write(0x1A, 0x11);        

pCamClass->I2C_write(0x1B, 0x20);        

pCamClass->I2C_write(0x1C, 0x20);                                                                                        

pCamClass->I2C_write(0x1D, 0x41);        

pCamClass->I2C_write(0x1F, 0x6D);        

pCamClass->I2C_write(0x22, 0x7B);        

pCamClass->I2C_write(0x21, 0x09);        

pCamClass->I2C_write(0x20, 0xD0);

// Remove forced blue screen

pCamClass->I2C_write(0x0C, 0x36);

// Flag last was NTSC

pCamClass->SetNTSCMode(false);

}

PDF

Hi,

Shared settings is differ from reference one.Please follow the settings mentioned in the Since you are using a 8-bit output,you can also refer to ADV7181C_ADV7181C@_ADV7341-VER.8bit-Out-Encoder.txt .

And also try to change the color control registers - Contrast(0x08),brightness(0x0a),Hue(0x0b) as mentioned in ADV7181C_Manuals_RevC.pdf.

Thanks,

Poornima