Could you help me find issue in sensor circuit?

Pin 6, ADO, defines the I2C address: low is 0x63; high is 0x64.  This pin is connected to something off image and the component SJ4.  Perhaps that is tied to ground somewhere which would seem ok, but if not - e.g. it is permanently high, or fluctuates, it will be 0x64 or just won’t work properly.  First thing is to test the voltage of pin6, preferably with a scope to see if it is fluctuating.  I can’t tell what SJ4 is so can’t check its datasheet.  The caps you mentioned don’t impact the I2C interface - note, don’t add capacitance to the I2C lines as it will affect the rise times and it may well not work properly.

As a final thought, there are Arduino scripts thst enumerate the I2C bus to tell you what is on it.  You could use, or adapt, that to check it isn’t hiding.  In fairness though, I think the issue is how you’ve connected ADO.

Hi Andrew J 

Thank you for your valuable feedback. Actually SJ4 is a jumper. So the device can be either at 0x63, if soldered to GND or it can be at 0x64. So in my case it will be 0x63 as it is soldered to GND pad.

Yes, I am trying the arduino i2cscan program to identify the device. Followed scottiebabe  suggestions and will try some other means to see if the sensor can work.
Thanks again!

So your jumper SJ4 is set to link either pins 1 and 2 or pins 2 and 3?  1 and 2 connect it to high (e.g. VSS voltage) and 2 and 3 to low (I.e. GND).  And currently it is pins 2 and 3?  Where does that trace go from pin 6 ADO off image?  Unfortunately, there’s a lot “off-image” in what you have pasted so it’s not possible to tell but TBH that looks a bit iffy unless it is to another jumper which is set exactly the same way as SJ4.  It feels like where missing a useful part of the picture here.

If you aren’t finding it on the bus, in my experience it has always come down to one of two things: (1) the IC isn’t powered; or (2) the address hasn’t been setup correctly.  Research tells me that it could also be a third thing: (3) too much capacitance on the SCL and/or SDO lines - you don’t have any additional external capacitors on those traces anywhere do you?  That impacts the rise time of the signals and the device ends up operating erratically or not at all.

Hi Andrew J 

Regarding the jumper SJ4 everything is correct in my opinion. It is connected to GND. and not to Vcc. Sorry for incomplete schematics. Here in this .pdf file you will find the full schematic. 

Well, The IC is powered  properly considering PCB layout. Because, I have used the same line(Vcc) to power the device. Regarding caps, there could be issue but all I can do is try some hardware technique.

What comes to my mind right now is that could be that the device is not soldered/handled properly while in assembly process. 

Maybe this screenshot of sensor PCB layout gives the hint that sensor is powered properly and all other pins like RESV(pin 8&9) are grounded as per the datasheet. Pins Vdd and Vddio are connected to 3.3V and pins Vss to GND. others are just AD0, for address selection, SCL &SDA, And last one for Chip select.

Maybe this screenshot of sensor PCB layout gives the hint that sensor is powered properly and all other pins like RESV(pin 8&9) are grounded as per the datasheet. Pins Vdd and Vddio are connected to 3.3V and pins Vss to GND. others are just AD0, for address selection, SCL &SDA, And last one for Chip select.