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LPS27HHTW guidelines for system integration

LuigiG
Associate

Hello everyone, I'm looking for an application note (similar to AN5063 but for the LPS27HHTW sensor) to get an idea of the mechanical integration and any necessary tolerances. Additionally, I wanted to ask the community if anyone has installed two sensors on the same side of the board and what the mechanical implications are in this case.

1 REPLY 1
Rob Ashworth
Senior

I have a board with 4 sensors in a line.

I did have a few issues, but mostly ok.

Things to watch out for - sensor spacing >3.2mm to allow enough room for the o-ring.

o-ring - go for as much cross section thickness as you can.  I had 0.7mm which is probably a bit on the thin side - ideally I would say 1mm cross section.

The metal caps did have a tendency to get ripped off if taking it in and out too many times.

Putting the sensors down by hand probably not a good idea as the alignment is quite critical for a good pneumatic seal.  reflow is the way to go, unless your really good at hand flow stuff.

Ideally tolerance 0.05mm, but 0.1mm may be ok depending on o-ring cross section.

20-30% compression ratio on the o-ring.