Impedance Control for U4 Design

Thought for 1 min 8 sec

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.

brooks

TM1673.png

please ignore this image

Thought for 25 sec

flux

Understood—the image will be ignored. Let me know what you’d like to work on next.

brooks

give me an example code block, just so I can test something

Thought for 38 sec

flux

Python
def greet(name):
    """
    Simple function to greet a user.
    """
    print(f"Hello, {name}!")

if __name__ == "__main__":
    # Test the greet function
    greet("World")

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