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Blevene / LabsConBadge_2023

LabsConBadge 2023
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Finalize IRDA transciever choice #8

Closed securelyfitz closed 1 year ago

securelyfitz commented 1 year ago

The IRDA transceiver for the proof of concept is pricey, and OOS with lcsc. We can stick with it, but that means manually adding components to the already assembled boards: TFBS4652-TR1 $3.02 from mouser

There are two options available from lcsc that should work: TFDU4101-TR3 $2.80 - cheaper, but bigger (not too big though) TFDU4301-TT1 $3.37 - available from lcsc, but points upwards not sideways

I have both on order. My hope is that i test the 4101 on the prototype pcbs when they arrive, and it works well enough to swap for the production run

securelyfitz commented 1 year ago

Looked at the different irda transceiver datasheets. The 4101,4301, and 4650 all have similar pinouts, except: 4101 is 1mm pitch instead of .95. Splitting the difference with .975 should work fine. 4650 has GND on pin 7; others have ground on pin 8. Put a pad for a 0 ohm resistor between 7 and 8.

Summary of changes needed:

  1. move RX from 2 to 4
  2. Move SD from 4 to 5
  3. Move GND from 7 to 8
  4. change C1 to 4.7u
  5. adjust pitch to .975
  6. add DNP 0 ohm resistor between 7 and 8
securelyfitz commented 1 year ago

4101 works great. Need to change PCB to match.

securelyfitz commented 1 year ago

schematic and footprint changes done; final board changes rolled up into #12