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I am looking at the Datasheet of HM10's IC (aka CC2541), and it says "Bluetooth v4.0 Compliant Protocol Stack" at page 2:

blt version

But in TI's website for this IC, they say "Bluetooth Low Energy 5.0".

CC2541

I guess their website is just doing marketing for the Bluetooth version. I trust the Datasheet more. But HM10 modules is a popular product (for Arduino-based projects at least). So I hope someone can be more specific of the actual version of the Bluetooth specification.

What is the Bluetooth version of the IC?

Christianidis Vasileios
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    good instinct trusting the datasheet! – Marcus Müller Mar 17 '22 at 14:36
  • I honestly think this is mostly a question for the TI sales people – Marcus Müller Mar 17 '22 at 14:38
  • Do you want the version this IC could support in a different product, or the version as supported by this IC in this specific product? Those can be very different things. Also remember that many BLE5 features are optional, a chip or device can be compliant without support for all of them. – jcaron May 16 '22 at 07:12
  • @jcaron The answer from Chris Knudsen is the correct answer, the version of the IC was originally Version4, but when Version5 BLT specifications came out, it was still compatible. – Christianidis Vasileios May 16 '22 at 07:25

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It looks to be a matter of when the device datasheet was written, and software/protocol updates.

From https://www.ti.com/lit/pdf/swru271 "CC2540/41 Bluetooth Low Energy Software Developer’s Guide (Rev. I)" we see on page 8: enter image description here

Chris Knudsen
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