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I have built some circuit and it doesn't work. Can I ask if my interpretation of datasheet is correct?

There is no hole, no proper dot on my package, but there is a symbol with 2 concentric circles and I interpreted that as pin 1 location.

This is how I I have done:

enter image description here

And this is image from datasheet:

enter image description here

And another one:

enter image description here

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  • \$\begingroup\$ Did you buy it from reputable seller. Note that is a common practice to use an arbitrary chip with the same package and then print the marking of whatever chip that currently is good selling. There are posts of people that etched the chip and took snapshots with a microscope to prove they were deceived from those sellers. \$\endgroup\$
    – Marko Buršič
    Commented Apr 10, 2021 at 19:29

2 Answers 2

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Yes, it's correct.

Here are two useful ways of locating pin-1:

  1. Hold the chip in a way that the top markings can be read. Pin-1 is located on the bottom-left. This also applies to QFP/LQFP and QFN packages.

enter image description here

  1. There's almost always a 45° cut on one side of the package. Pin-1 is located on that side (I marked the cuts with red rectangles in the following two images).

enter image description here

enter image description here

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Yes, your interpretation is correct.

Of course, if you purchased the IC from other than an authorized distributor it may not be exactly what is claimed.

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