Power Rails
Hardware version
MDD400 v2.9 — Fabricated prototype — testing phase
| Rail | Voltage | Source | Loads |
|---|---|---|---|
| NET-S | 12 V nominal (8–14.8 V) | NMEA 2000 backbone | Input power |
| VCC | 3.3 V regulated | LMR51610 buck converter (U1) | ESP32-S3, OPT3004, TMP112, SN65HVD234 logic side |
| VDD | 5.0 V regulated | LMR51610 buck converter (U6) | HMI display, MLT-8530 buzzer |
| VST | 12 V (legacy domain) | Legacy serial connector pin 1 | Legacy serial RX/TX opto-isolators (input side) |
For supply-design rationale and bring-up notes, see Power Supplies and CAN Bus Power Protection.