The one that I am trying to address with this test is a TI HDC2010. It's ADDR signal is tied to ground so I expect its address to be 0x40. You are absolutely correct that I had made an error on the address. I had been using the correct address but reverted to the address in the example, which is incorrect. Compounding the issue was that there was a problem with the test point on which I was measuring SDA. I switched to reading SDA at another point (after correcting the address) and confirmed correct functionality. Thanks.
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