Jessica

So… that got me thinking about the dongle. Of the two compatible dongles, it's the "basic" version; it is exclusively for the headset audio. There's another version which is also a "Unifying Receiver". For a moment we were speculating that maybe it's literally the same hardware and so reporting as a mouse, but… they're different sizes.

Okay, so, to my favourite teardown without a spudger resource, fccid.io.

Here's the first dongle;

Photograph of a small circuit board behind a metal rule. USB contacts are visible to the right, along with supporting circuitry, and a large white screenprinted section with an LED in the middle of it. — JNZA00083 on fccid.io

Photograph of a small circuit board behind a metal rule. A PCB antenna is visible on the right, along with a large primary integrated circuit, which is a Cambridge Silicon Radio part. — JNZA00083 on fccid.io

So, about what you'd expect, right? We've got one main Cambridge Silicon Radio IC, an antenna, and a bunch of supporting components. Fair enough, makes sense.

Well, let's crack open the other one.

Photograph of a larger circuit. USB contacts are visible to the left. A CC2544 IC is visible in the middle of the board, along with an LED, and supporting components and test points. — JNZA00095 on fccid.io

Photograph of a larger circuit board behind a metal rule. A PCB antenna is visible on the right, along with a two more integrated circuits, one of which is a Cambridge Silicon Radio part. — JNZA00095 on fccid.io

Okay, so it's got three ICs, fascinating. One of them is recognisably the same Cambridge Silicon Radio part as the prior device, so what are the other two?

Well one of them is a Texas Instruments part, the CC2544, which is a "system-on-chip for USB 2.4GHz applications". Fair enough, that is what we're up to.

And the final IC?

it's a Terminus FE1.1S USB 2.0 High Speed 4-Port Hub Controller

that's right, they glued the basic dongle to a USB hub and an additional USB device

phenomenal

#fccid #Teardown #Logitech #dongle #Texas Instruments #terminus #integrated circuits #usb #engineering #electronics #Cambridge Silicon Radio #fccid.io

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in reply to @ticky's post:

bark. bark bark @bark8/18/2023, 12:23 AM

because of how useful fcc id applications are for re, i think it should be a law that you have to upload .raw files where all the part numbers are clearly visible. so many like 200x300 images

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