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Naresh,
The address used to be incorrect on an old version of the datasheet. It has since been corrected on the newest version of the datasheet.
Best,
Chris
Again, the waveform does not look like the correct address. (But it would be necessary to see SCL and SDA at the same time to confirm.)
Also check that your I²C pins are configured as open drain.
Hi Clemens,
when i use same code and put external i2c expander, with address 0x20 i.e. for external expander module. it works good.
External i2c expander is connected with same pins with some test points on PCBA.
Hi Bobby,
I have tried with address 0x70, as mentioned in device datasheet as well., but not working for 0x70
We do not know whether your unknown microcontroller uses 8-bit or 7-bit addresses; try 0x38.
Naresh,
It may also help if you're able to get the SDA/SCL signals on the same scope capture when the device ACKs.
I suggest we also confirm what the top marking on the device is.
-Bobby