What is the RT1 resistor for, and why is it's profile higher than the adjacent P9 connector?

[Marcos Scriven]

There's a large (relative to everything else on the board) orange resistor labelled 'RT1' on my BBB, next to the USB port.

First question is, what's it for? Second question is, was it intentional for it to be 3 or 4 mm higher than the P9 connector? It seems to have unnecessarily long legs.

[Gerald Coley]

It is described in the SRM.

It is a PTC to limit the current consumed by a HDMI monitor when powering the EEPROM circuitry in that monitor.

That is the package size that part came in. We did not make the part ourselves.. We just bought it.

So there was no evil intent to find the biggest device we could find.

Gerald

On Tue, Aug 13, 2013 at 11:56 AM, Marcos Scriven <mar...@scriven.org> wrote:

There's a large (relative to everything else on the board) orange resistor labelled 'RT1' on my BBB, next to the USB port.

First question is, what's it for? Second question is, was it intentional for it to be 3 or 4 mm higher than the P9 connector? It seems to have unnecessarily long legs.

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[Marcos Scriven]

On Tuesday, August 13, 2013 6:53:23 PM UTC+1, Gerald wrote:

It is described in the SRM.

It is a PTC to limit the current consumed by a HDMI monitor when powering the EEPROM circuitry in that monitor.

Ok thanks for info

 

That is the package size that part came in. We did not make the part ourselves.. We just bought it.

So there was no evil intent to find the biggest device we could find.

Well, I assumed there was no evil intent :) And I also figured you weren't in the business of manufacturing resistors!

But it does rather stick out like a sore thumb, compared to how beautifully the rest is put together. I can't imagine there wasn't another option.

[Gerald Coley]

I looked. This was the lowest cost device that we could find at the time and still do the job. 

So, what is your issue with it? If you like, you can just remove it.

Gerald

[Marcos Scriven]

It just means that capes will need a higher clearance for just that one component (as seen from the profile pic I attached). I'd remove it, but wouldn't want to void the warranty - at least not yet.

[Gerald Coley]

That is not generally not an issue based on using standard available connectors, If you decide to cut one down, it may be a little issue. You ca always just press it down like I just did between the USB and the expansion header.

Gerald

On Tue, Aug 13, 2013 at 1:57 PM, Marcos Scriven <mar...@scriven.org> wrote:

It just means that capes will need a higher clearance for just that one component (as seen from the profile pic I attached). I'd remove it, but wouldn't want to void the warranty - at least not yet.