# Placement rules (derived)

| type | constraint | weight | why |
|---|---|---|---|
| fixed | SW1 |  | connector (mechanical interface) |
| fixed | J2 |  | connector (mechanical interface) |
| fixed | J1 |  | connector (mechanical interface) |
| near | C3.1 ≤ 1.85 mm from U2.5 (pad edge to edge) | 12.0 | U2 output cap 10uF at VOUT (regulator stability) |
| near | C5.1 ≤ 0.85 mm from U1.4 (pad edge to edge) | 10.0 | decoupling U1 VDD (+3V3), 100nF |
| near | C2.1 ≤ 1.85 mm from U2.1 (pad edge to edge) | 10.0 | decoupling U2 VIN (VBUS), 1uF |
| near | C1.1 ≤ 4.35 mm from J1.A4 (pad edge to edge) | 4.0 | input bulk cap 4.7uF on VBUS at power entry J1 |