11 lines
748 B
Markdown
11 lines
748 B
Markdown
|
# RFTool Rev 1.0 Hardware Errata and Notes
|
||
|
|
- The Schottky diode for the +3.3V buck converter is missing. Connect a
|
||
|
|
Schottky such as the MBR0520 between ground and the SW pin of U4.
|
||
|
|
- The connector part in the BOM used for P5 (JTAG) does not have enough clearance
|
||
|
|
to fit the connector on the JTAG ribbon cable, at least for the cable included with my Waveshare
|
||
|
|
dongle. Ideally another connector should be used.
|
||
|
|
- Trace widths will need to be adjusted to meet impedance requirements depending on your stackup.
|
||
|
|
`rftool_impedances.png` shows impedance control requirements. Green is 50Ω single ended; blue is 50Ω differential
|
||
|
|
and yellow is 75Ω differential. The USB 3 pairs were not included in this diagram but should be 100Ω differential.
|
||
|
|
|