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Impedance & routing

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Impedance & routing

Differential-pair calculation and routing work for the isoSPI interface.

Altium differential pair impedance calculation

Calculate.
Route. Inspect.

The isoSPI differential pair was set to a 100 Ω target in Altium before routing through the interface section.

100 ΩTarget

100.01 ΩCalculated

Altium calculation.
Not a hardware measurement.

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Altium Layer Stack Manager showing a 100 ohm differential impedance target and 100.01 ohm calculated impedance — 100 Ω impedance setup
Altium calculation: 100 Ω target, 100.01 Ω calculated, 0.29153 mm trace width and 0.2 mm gap.

Altium differential-pair editor with IP P and IM N traces routed on the front copper layer — Active pair routing
Differential-pair routing for IP_P and IM_N on F.Cu.

Altium board editor with one differential routing segment selected between IP P and IM N — Pair trace editing
Selected routing segment between IP_P and IM_N in Altium.

Altium board-level view of the routed differential pair through the interface circuit — Pair layout
Board-level view of the routed pair through the interface section.

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Monitoring interfaces