CH340C

@@ -0,0 +1,63 @@+# CH340C++**Unknown** · USB Converters · SOP-16++CH340C from Unknown, in a SOP-16. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | GND | power_in | Common ground reference. Connect directly to the USB bus ground. |+| 2 | TXD | output | Serial data output (UART TX). Idles high on CH340C. |+| 3 | RXD | input | Serial data input (UART RX) with internal software-controllable pull-up and pull-down. |+| 4 | V3 | power_in | Internal 3.3 V regulator node. In 5 V operation, connect a 0.1 uF decoupling capacitor to GND. In 3.3 V operation, tie V3 to VCC and to the external 3.3 V supply. |+| 5 | UD+ | bidirectional | USB D+ data line. Connect directly to the USB bus D+; do not add a series resistor (internal USB pull-up and transceiver are integrated). |+| 6 | UD- | bidirectional | USB D- data line. Connect directly to the USB bus D-; do not add a series resistor. |+| 7 | NC | unconnected | No connect on CH340C. Must be left floating. |+| 8 | OUT#/DTR# | output | MODEM general-purpose output signal (software defined, active low). On CH340C batches whose lot code starts with 4 and whose last three digits are greater than B40, adding a 4.7 kΩ pull-down converts this pin to a second DTR#. |+| 9 | CTS# | input | MODEM Clear-To-Send handshake input, active low (or high when auxiliary RS-232 mode is enabled). |+| 10 | DSR# | input | MODEM Data Set Ready handshake input, active low (or high in auxiliary RS-232 mode). |+| 11 | RI# | input | MODEM Ring Indicator input, active low (or high in auxiliary RS-232 mode). |+| 12 | DCD# | input | MODEM Data Carrier Detect input, active low (or high in auxiliary RS-232 mode). |+| 13 | DTR# | output | MODEM Data Terminal Ready output, active low (or high in auxiliary RS-232 mode). Used for MCU DTR#-default-high one-key download flows. |+| 14 | RTS# | output | MODEM Request To Send output, active low (or high in auxiliary RS-232 mode). |+| 15 | R232 | input | Auxiliary RS-232 enable input, active high, with internal pull-down. When high, an inverter is inserted on RXD and the MODEM signal polarities invert. Sampled only once at power-on reset. |+| 16 | VCC | power_in | Positive supply input. Requires a 0.1 uF decoupling capacitor to GND. Accepts 5 V (4.0-5.3 V) or 3.3 V (3.1-3.6 V, with V3 tied to VCC). |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Unknown |+| Package | SOP-16 |+| Category | Interface |+| Pins | 16 |++## Ordering variants++- `CH340C`+- `CH340CCH340G`+- `CH340CCH340B`+- `CH340CCH340N`+- `CH340CCH340K`+- `CH340CCH340E`+- `CH340CCH340X`+- `CH340CCH340T`+- `CH340CCH340R`++## CAD (KiCad official)++- Symbol: `CH340C`+- Footprint: `Package_SO:SOIC-16_3.9x9.9mm_P1.27mm`+- 3D model: SOP-16 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Unknown datasheet](docs/ch340c-datasheet.pdf) (10 pp, sha256 `ea6cde8472044256`, retrieved 2026-08-17, tier: lcsc)+- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.+- **CAD:** KiCad official libraries (CC-BY-SA 4.0).++[Datasheet PDF](docs/ch340c-datasheet.pdf)

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