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diff --git a/docs/POWER.md b/docs/POWER.md new file mode 100644 index 0000000..9082796 --- /dev/null +++ b/docs/POWER.md @@ -0,0 +1,12 @@ +# Power — T-Modem-s1224 + +| Net / path | Role | +|------------|------| +| `VIN_12` | Barrel jack **5.5×2.1** centre-**positive** | +| `U_REG` | Buck **12 V → 5 V** (Mini560 5 V class / MP1584-class on headers) | +| `+5V` / `+5V_REG` | Board rail after buck (+ optional series PTC) | +| `GND` | Common ground | +| USB `VBUS` | **Isolated** — **DNI** OR diode · **no** feed into 5 V rail | +| USB D+/D− / GND | Flash + CDC command path to Pico · LCD service via Pico | + +Pico **VSYS/VBUS pin on headers** is fed from the **board 5 V rail**, not from the Type-A receptacle VBUS. |