# Voltage-domain ERC — give-me-usb-uart

0 error(s), 0 warning(s). Ambient 50 °C. Specs: `specs/parts/`.

## Rails (power budget)

| rail | source | V | load mA | rated mA | use | nets |
|---|---|---|---|---|---|---|
| +3V3 | U2 | 3.23..3.37 | 12.0 | 500 | 2 % | +3V3 |
| VBUS | external | 4.75..5.5 | 12.1 | - |  | VBUS, +5V |

### Loads

| rail | net | ref.pin | mA |
|---|---|---|---|
| +3V3 | +3V3 | U1.16 | 12.00 |
| VBUS | +5V | U2.in | 12.05 |

### Beads / series inductors

| ref | from | to | mA | DCR Ω | drop mV | rated mA |
|---|---|---|---|---|---|---|
| F1 | VBUS | +5V | 12.1 | 0.5 | 6.0 | 750 |

## Thermal budget

| ref | part | P mW | basis | θJA °C/W | Tj °C | limit °C | |
|---|---|---|---|---|---|---|---|
| U1 | CH340C | 40 | Σ V·I_max of supply pins | 100 | 54 | 125 | ok |
| U2 | RT9013-33GB | 27 | (5.50-3.23) V x 12 mA | 250 | 57 | 125 | ok |
| U3 | USBLC6-2SC6 | 0 | Σ V·I_max of supply pins | 300 | 50 | 125 | ok |

## Per-pin table

| ref | pin | name | type | net | V | limit | status |
|---|---|---|---|---|---|---|---|
| D1 | 1 | K | passive | GND | 0 |  | ok |
| D1 | 2 | A | passive | LED_PWR | 4.74..5.5 |  | ok |
| D2 | 1 | K | passive | TXD | 0..3.37 |  | ok |
| D2 | 2 | A | passive | LED_TX | 3.23..3.37 |  | ok |
| D3 | 1 | K | passive | RXD | 0..3.37 |  | ok |
| D3 | 2 | A | passive | LED_RX | 3.23..3.37 |  | ok |
| F1 | 1 | 1 | passive | VBUS | 4.75..5.5 |  | ok |
| F1 | 2 | 2 | passive | +5V | 4.74..5.5 |  | ok |
| J1 | A1 | GND | passive | GND | 0 |  | ok |
| J1 | A4 | VBUS | passive | VBUS | 4.75..5.5 |  | ok |
| J1 | A5 | CC1 | passive | CC1 | 0 |  | ok |
| J1 | A6 | DP1 | passive | USB_DP | ? |  | ok |
| J1 | A7 | DN1 | passive | USB_DN | ? |  | ok |
| J1 | A8 | SBU1 | passive | - | ? |  | nc |
| J1 | A9 | VBUS | passive | VBUS | 4.75..5.5 |  | ok |
| J1 | A12 | GND | passive | GND | 0 |  | ok |
| J1 | B1 | GND | passive | GND | 0 |  | ok |
| J1 | B4 | VBUS | passive | VBUS | 4.75..5.5 |  | ok |
| J1 | B5 | CC2 | passive | CC2 | 0 |  | ok |
| J1 | B6 | DP2 | passive | USB_DP | ? |  | ok |
| J1 | B7 | DN2 | passive | USB_DN | ? |  | ok |
| J1 | B8 | SBU2 | passive | - | ? |  | nc |
| J1 | B9 | VBUS | passive | VBUS | 4.75..5.5 |  | ok |
| J1 | B12 | GND | passive | GND | 0 |  | ok |
| J1 | S1 | SHIELD | passive | GND | 0 |  | ok |
| J2 | 1 | GND | passive | GND | 0 |  | ok |
| J2 | 2 | 5V | passive | +5V | 4.74..5.5 |  | ok |
| J2 | 3 | 3V3 | passive | +3V3 | 3.23..3.37 |  | ok |
| J2 | 4 | TXD | passive | TXD | 0..3.37 |  | ok |
| J2 | 5 | RXD | passive | RXD | 0..3.37 |  | ok |
| J2 | 6 | DTR | passive | DTR | 0..3.37 |  | ok |
| J2 | 7 | RTS | passive | RTS | 0..3.37 |  | ok |
| J2 | 8 | CTS | passive | CTS | 0..3.37 |  | ok |
| U1 | 1 | GND | ground | GND | 0 |  | ok |
| U1 | 2 | TXD | output | TXD | 0..3.37 |  | ok |
| U1 | 3 | RXD | input | RXD | 0..3.37 | max 3.23 abs 3.73 | ok |
| U1 | 4 | V3 | supply | +3V3 | 3.23..3.37 | min 3.1 max 3.6 abs 6 | ok |
| U1 | 5 | UD+ | bus | USB_DP | ? |  | ok |
| U1 | 6 | UD- | bus | USB_DN | ? |  | ok |
| U1 | 7 | NC | nc | - | ? |  | nc |
| U1 | 8 | OUT# | output | - | ? |  | nc |
| U1 | 9 | CTS# | input | CTS | 0..3.37 | max 3.23 abs 3.73 | ok |
| U1 | 10 | DSR# | input | - | ? |  | nc |
| U1 | 11 | RI# | input | - | ? |  | nc |
| U1 | 12 | DCD# | input | - | ? |  | nc |
| U1 | 13 | DTR# | output | DTR | 0..3.37 |  | ok |
| U1 | 14 | RTS# | output | RTS | 0..3.37 |  | ok |
| U1 | 15 | R232 | input | - | ? |  | nc |
| U1 | 16 | VCC | supply | +3V3 | 3.23..3.37 | min 3.1 max 3.6 abs 6 | ok |
| U2 | 1 | VIN | supply | +5V | 4.74..5.5 | min 2.2 max 5.5 abs 6 | ok |
| U2 | 2 | GND | ground | GND | 0 |  | ok |
| U2 | 3 | EN | input | +5V | 4.74..5.5 | min 0 max 5.5 abs 6 | ok |
| U2 | 4 | NC | nc | - | ? |  | nc |
| U2 | 5 | VOUT | supply_out | +3V3 | 3.23..3.37 |  | ok |
| U3 | 1 | I/O1 | bus | USB_DP | ? |  | ok |
| U3 | 2 | GND | ground | GND | 0 |  | ok |
| U3 | 3 | I/O2 | bus | USB_DN | ? |  | ok |
| U3 | 4 | I/O2 | bus | USB_DN | ? |  | ok |
| U3 | 5 | VBUS | supply | VBUS | 4.75..5.5 | min 0 max 5.5 abs 6 | ok |
| U3 | 6 | I/O1 | bus | USB_DP | ? |  | ok |

## Spec sources

- `specs/parts/KT-0603G.yaml` (KT-0603G): Hubei KENTO KT-0603G spec for approval rev A.0 (LCSC C12624): Absolute Maximum Ratings, Electrical Optical Characteristics
- `specs/parts/KT-0603R.yaml` (KT-0603R): Hubei KENTO KT-0603R spec for approval rev A.0 (2018-12-06): 4. Absolute Maximum Ratings, 5. Electrical Optical Characteristics, 6.2 Vf bins
- `specs/parts/nSMD075.yaml` (nSMD075): PTC resettable fuse nSMD series (LCSC C70078): electrical characteristics table (nSMD075 row), Ihold vs temperature table
- `specs/parts/TYPE-C-31-M-12.yaml` (TYPE-C-31-M-12): Korean Hroparts TYPE-C-31-M-12 drawing (LCSC C165948); pin names follow the USB Type-C receptacle pinout
- `specs/parts/Header-1x08.yaml` (PZ254V-11-08P): Generic 1x8 2.54 mm pin header (XFCN PZ254V-11-08P, LCSC C492407); no electrical limits used by ERC
- `specs/parts/CH340C.yaml` (CH340C): WCH CH340 datasheet V3C (LCSC C84681): 4. Pin (SOP16 column), 5.1 power, 6.1 Absolute Maximum, 6.3 3.3V Electrical Parameters
- `specs/parts/RT9013-33.yaml` (RT9013-33GB): Richtek DS9013-10 (Apr 2011, LCSC C47773): Functional Pin Description (SOT-23-5), Absolute Maximum Ratings, Recommended Operating Conditions, Electrical Characteristics
- `specs/parts/USBLC6-2SC6.yaml` (USBLC6-2SC6): ST USBLC6-2 Doc ID 11265 Rev 5 (Oct 2011, LCSC C7519): pinout figure, Table 1 Absolute ratings, Table 2 Electrical characteristics