Impedance Control for U4 Design
Thought for 1 min 8 sec
flux
For mockup diversity, you can designate several “pseudo-pairs” on the ESP32 to exercise pair-routing tools. Nothing here is true differential data, but it gives you variety and shows off your controlled-impedance stackup.
Component: U4
Proposed “pairs” (100 Ω differential style, matched lengths):
Table
| Pair Group | U4 Pin Names | Impedance Control | Pair Routed? |
|---|---|---|---|
| SPI Clocks | IO18 / IO14 | 100 Ω differential | Yes |
| SPI Data | IO19 / IO12 | 100 Ω differential | Yes |
| SPI Data | IO23 / IO13 | 100 Ω differential | Yes |
All other high-speed signals remain single-ended at 50 Ω:
- VSPI_CLK, VSPI_MISO, VSPI_MOSI (when used standalone)
- HSPI_CLK, HSPI_MISO, HSPI_MOSI
- SDIO_CMD, SDIO_D0–D3
- CANBUS_TX, CANBUS_RX
Use matched-length constraints on your pseudo-pairs to mimic true diff-pair tuning.
TM1673
Thought for 25 sec
flux
Understood—the image will be ignored. Let me know what you’d like to work on next.
give me an example code block, just so I can test something
Thought for 38 sec
flux
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