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CH348Q
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WCH Jiangsu Qin Heng USB Converters, LQFP-48(7x7). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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README.mdadded+85@@ -0,0 +1,85 @@+# CH348Q++**WCH Jiangsu Qin Heng** · USB Converters · LQFP-48(7x7)++CH348Q from WCH Jiangsu Qin Heng, in a LQFP-48(7x7). 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 | NC | unconnected | No connection, must be left floating. |+| 2 | CFG | input | TNOW and DTR function configuration pin; high/floating during power-up configures all DTRx/TNOWx as TNOW function; low configures as DTR function with optional independent configuration via pull-down resistors. |+| 3 | NC | unconnected | No connection, must be left floating. |+| 4 | NC | unconnected | No connection, must be left floating. |+| 5 | XI | input | Crystal oscillator input for 8MHz clock generation. |+| 6 | XO | output | Crystal oscillator reverse phase output for 8MHz clock generation. |+| 7 | RESET | input | External reset input, active low, internal pull-up resistor. |+| 8 | GND | power_in | Common ground connection to USB bus ground. |+| 9 | VCC | power_in | Positive power supply input 3.3V, requires external 0.1µF decoupling capacitor. |+| 10 | CTS1/GPIO2 | input | UART1 Clear To Send MODEM input signal, active low; general purpose GPIO2 for input or output. |+| 11 | RTS1/GPIO3 | output | UART1 Request To Send MODEM output signal, active low; general purpose GPIO3 for input or output. |+| 12 | TXD1 | output | UART1 serial data output, idle state high level. |+| 13 | RXD1 | input | UART1 serial data input, internal pull-up resistor. |+| 14 | ACT | output | USB configuration complete status output, active low. |+| 15 | DTR1/TNOW1/GPIO9 | bidirectional | UART1 Data Terminal Ready MODEM output signal active low; UART1 RS485 transmit/receive control pin; general purpose GPIO9 for input or output. |+| 16 | TXD6 | output | UART6 serial data output, idle state high level. |+| 17 | RXD6 | input | UART6 serial data input, internal pull-up resistor. |+| 18 | TXD3 | output | UART3 serial data output, idle state high level. |+| 19 | RXD3 | input | UART3 serial data input, internal pull-up resistor. |+| 20 | GND | power_in | Common ground connection to USB bus ground. |+| 21 | TXD2 | output | UART2 serial data output, idle state high level. |+| 22 | RXD2 | input | UART2 serial data input, internal pull-up resistor, 5V tolerant. |+| 23 | GND | power_in | Common ground connection to USB bus ground. |+| 24 | VCC | power_in | Positive power supply input 3.3V, requires external 0.1µF decoupling capacitor. |+| 25 | CTS3/GPIO6 | input | UART3 Clear To Send MODEM input signal active low, 5V tolerant; general purpose GPIO6 for input or output. |+| 26 | CTS2/GPIO4 | input | UART2 Clear To Send MODEM input signal active low, 5V tolerant; general purpose GPIO4 for input or output. |+| 27 | RTS2/GPIO5 | output | UART2 Request To Send MODEM output signal, active low; general purpose GPIO5 for input or output. |+| 28 | RTS3/GPIO7 | output | UART3 Request To Send MODEM output signal, active low; general purpose GPIO7 for input or output. |+| 29 | DTR2/TNOW2/GPIO10 | bidirectional | UART2 Data Terminal Ready MODEM output signal active low; UART2 RS485 transmit/receive control pin; 5V tolerant; general purpose GPIO10 for input or output. |+| 30 | TXD0 | output | UART0 serial data output, idle state high level. |+| 31 | RXD0 | input | UART0 serial data input, internal pull-up resistor, 5V tolerant. |+| 32 | CTS0/GPIO0 | input | UART0 Clear To Send MODEM input signal active low, 5V tolerant; general purpose GPIO0 for input or output. |+| 33 | RTS0/GPIO1 | output | UART0 Request To Send MODEM output signal, active low; external pull-down on this pin during power-up disables internal EEPROM configuration and enables default parameters; general purpose GPIO1 for input or output. |+| 34 | DTR0/TNOW0/GPIO8 | bidirectional | UART0 Data Terminal Ready MODEM output signal active low; UART0 RS485 transmit/receive control pin; 5V tolerant; general purpose GPIO8 for input or output. |+| 35 | GND | power_in | Common ground connection to USB bus ground. |+| 36 | VCC | power_in | Positive power supply input 3.3V, requires external 0.1µF decoupling capacitor. |+| 37 | TXD7 | output | UART7 serial data output, idle state high level. |+| 38 | RXD7 | input | UART7 serial data input, internal pull-up resistor, 5V tolerant. |+| 39 | DTR3/TNOW3/GPIO11 | bidirectional | UART3 Data Terminal Ready MODEM output signal active low; UART3 RS485 transmit/receive control pin; 5V tolerant; general purpose GPIO11 for input or output. |+| 40 | TXD4 | output | UART4 serial data output, idle state high level. |+| 41 | RXD4 | input | UART4 serial data input, internal pull-up resistor, 5V tolerant. |+| 42 | UD- | passive | USB bus D- differential data signal, direct connection to USB connector without series resistor. |+| 43 | UD+ | passive | USB bus D+ differential data signal, direct connection to USB connector without series resistor. |+| 44 | TEST | input | Internal test pin, recommend connecting 4.7kΩ pull-down resistor to ground or direct ground connection. |+| 45 | TXD5 | output | UART5 serial data output, idle state high level. |+| 46 | RXD5 | input | UART5 serial data input, internal pull-up resistor. |+| 47 | GND | power_in | Common ground connection to USB bus ground. |+| 48 | VCC | power_in | Positive power supply input 3.3V, requires external 0.1µF decoupling capacitor. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | WCH Jiangsu Qin Heng |+| Package | LQFP-48(7x7) |+| Category | Interface |+| Pins | 48 |++## CAD (KiCad official)++- Symbol: `CH348Q`+- Footprint: `Package_QFP:LQFP-48_7x7mm_P0.5mm`+- 3D model: LQFP-48(7x7) (KiCad packages3D, STEP)+- 3D model files: `ch348q-etched.step` / `ch348q-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ch348q.step` / `ch348q.glb` are the bare package body.++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [WCH Jiangsu Qin Heng datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8589040309539901440) (9 pp, sha256 `df5440c74e6a0dfe`, retrieved 2026-09-17, tier: lcsc)+- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.+- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.2`, primary `claude-haiku-4-5-20251001` (text), consensus `claude-sonnet-4-6` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.+- **CAD:** KiCad official libraries (CC-BY-SA 4.0).++[Datasheet PDF](docs/ch348q-datasheet.pdf)
page.jsonadded+381@@ -0,0 +1,381 @@+{+ "slug": "ch348q",+ "version": "0.1.0",+ "type": "component",+ "description": "WCH Jiangsu Qin Heng USB Converters, LQFP-48(7x7). Datasheet-verified pinout, KiCad symbol/footprint/3D.",+ "tags": [+ "component",+ "interface",+ "ch348q",+ "factory-2.0.0",+ "extractor-text"+ ],+ "dependencies": {},+ "hero": {+ "type": "image",+ "path": "docs/hero.png"+ },+ "files": [+ "page.json",+ "README.md",+ "ch348q.kicad_sym",+ "ch348q.kicad_mod",+ "ch348q.glb",+ "ch348q.step",+ "ch348q.lbr",+ "docs/hero.png",+ "docs/ch348q-datasheet.pdf",+ "viewers/symbol.html",+ "viewers/footprint.html"+ ],+ "component": {+ "mpn": "CH348Q",+ "manufacturer": "WCH Jiangsu Qin Heng",+ "package": "LQFP-48(7x7)",+ "pin_count": 48,+ "category": "Interface",+ "subcategory": "USB Converters",+ "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8589040309539901440",+ "parts": {+ "symbol": "ch348q.kicad_sym",+ "footprint": "ch348q.kicad_mod",+ "model_3d": "ch348q-etched.glb",+ "model_3d_plain": "ch348q.glb",+ "model_3d_step": "ch348q-etched.step",+ "model_3d_step_plain": "ch348q.step",+ "lbr": "ch348q.lbr"+ },+ "distributor_links": {+ "lcsc": "C2979161"+ },+ "pins": [+ {+ "number": "1",+ "name": "NC",+ "type": "unconnected",+ "description": "No connection, must be left floating."+ },+ {+ "number": "2",+ "name": "CFG",+ "type": "input",+ "description": "TNOW and DTR function configuration pin; high/floating during power-up configures all DTRx/TNOWx as TNOW function; low configures as DTR function with optional independent configuration via pull-down resistors."+ },+ {+ "number": "3",+ "name": "NC",+ "type": "unconnected",+ "description": "No connection, must be left floating."+ },+ {+ "number": "4",+ "name": "NC",+ "type": "unconnected",+ "description": "No connection, must be left floating."+ },+ {+ "number": "5",+ "name": "XI",+ "type": "input",+ "description": "Crystal oscillator input for 8MHz clock generation."+ },+ {+ "number": "6",+ "name": "XO",+ "type": "output",+ "description": "Crystal oscillator reverse phase output for 8MHz clock generation."+ },+ {+ "number": "7",+ "name": "RESET",+ "type": "input",+ "description": "External reset input, active low, internal pull-up resistor."+ },+ {+ "number": "8",+ "name": "GND",+ "type": "power_in",+ "description": "Common ground connection to USB bus ground."+ },+ {+ "number": "9",+ "name": "VCC",+ "type": "power_in",+ "description": "Positive power supply input 3.3V, requires external 0.1µF decoupling capacitor."+ },+ {+ "number": "10",+ "name": "CTS1/GPIO2",+ "type": "input",+ "description": "UART1 Clear To Send MODEM input signal, active low; general purpose GPIO2 for input or output."+ },+ {+ "number": "11",+ "name": "RTS1/GPIO3",+ "type": "output",+ "description": "UART1 Request To Send MODEM output signal, active low; general purpose GPIO3 for input or output."+ },+ {+ "number": "12",+ "name": "TXD1",+ "type": "output",+ "description": "UART1 serial data output, idle state high level."+ },+ {+ "number": "13",+ "name": "RXD1",+ "type": "input",+ "description": "UART1 serial data input, internal pull-up resistor."+ },+ {+ "number": "14",+ "name": "ACT",+ "type": "output",+ "description": "USB configuration complete status output, active low."+ },+ {+ "number": "15",+ "name": "DTR1/TNOW1/GPIO9",+ "type": "bidirectional",+ "description": "UART1 Data Terminal Ready MODEM output signal active low; UART1 RS485 transmit/receive control pin; general purpose GPIO9 for input or output."+ },+ {+ "number": "16",+ "name": "TXD6",+ "type": "output",+ "description": "UART6 serial data output, idle state high level."+ },+ {+ "number": "17",+ "name": "RXD6",+ "type": "input",+ "description": "UART6 serial data input, internal pull-up resistor."+ },+ {+ "number": "18",+ "name": "TXD3",+ "type": "output",+ "description": "UART3 serial data output, idle state high level."+ },+ {+ "number": "19",+ "name": "RXD3",+ "type": "input",+ "description": "UART3 serial data input, internal pull-up resistor."+ },+ {+ "number": "20",+ "name": "GND",+ "type": "power_in",+ "description": "Common ground connection to USB bus ground."+ },+ {+ "number": "21",+ "name": "TXD2",+ "type": "output",+ "description": "UART2 serial data output, idle state high level."+ },+ {+ "number": "22",+ "name": "RXD2",+ "type": "input",+ "description": "UART2 serial data input, internal pull-up resistor, 5V tolerant."+ },+ {+ "number": "23",+ "name": "GND",+ "type": "power_in",+ "description": "Common ground connection to USB bus ground."+ },+ {+ "number": "24",+ "name": "VCC",+ "type": "power_in",+ "description": "Positive power supply input 3.3V, requires external 0.1µF decoupling capacitor."+ },+ {+ "number": "25",+ "name": "CTS3/GPIO6",+ "type": "input",+ "description": "UART3 Clear To Send MODEM input signal active low, 5V tolerant; general purpose GPIO6 for input or output."+ },+ {+ "number": "26",+ "name": "CTS2/GPIO4",+ "type": "input",+ "description": "UART2 Clear To Send MODEM input signal active low, 5V tolerant; general purpose GPIO4 for input or output."+ },+ {+ "number": "27",+ "name": "RTS2/GPIO5",+ "type": "output",+ "description": "UART2 Request To Send MODEM output signal, active low; general purpose GPIO5 for input or output."+ },+ {+ "number": "28",+ "name": "RTS3/GPIO7",+ "type": "output",+ "description": "UART3 Request To Send MODEM output signal, active low; general purpose GPIO7 for input or output."+ },+ {+ "number": "29",+ "name": "DTR2/TNOW2/GPIO10",+ "type": "bidirectional",+ "description": "UART2 Data Terminal Ready MODEM output signal active low; UART2 RS485 transmit/receive control pin; 5V tolerant; general purpose GPIO10 for input or output."+ },+ {+ "number": "30",+ "name": "TXD0",+ "type": "output",+ "description": "UART0 serial data output, idle state high level."+ },+ {+ "number": "31",+ "name": "RXD0",+ "type": "input",+ "description": "UART0 serial data input, internal pull-up resistor, 5V tolerant."+ },+ {+ "number": "32",+ "name": "CTS0/GPIO0",+ "type": "input",+ "description": "UART0 Clear To Send MODEM input signal active low, 5V tolerant; general purpose GPIO0 for input or output."+ },+ {+ "number": "33",+ "name": "RTS0/GPIO1",+ "type": "output",+ "description": "UART0 Request To Send MODEM output signal, active low; external pull-down on this pin during power-up disables internal EEPROM configuration and enables default parameters; general purpose GPIO1 for input or output."+ },+ {+ "number": "34",+ "name": "DTR0/TNOW0/GPIO8",+ "type": "bidirectional",+ "description": "UART0 Data Terminal Ready MODEM output signal active low; UART0 RS485 transmit/receive control pin; 5V tolerant; general purpose GPIO8 for input or output."+ },+ {+ "number": "35",+ "name": "GND",+ "type": "power_in",+ "description": "Common ground connection to USB bus ground."+ },+ {+ "number": "36",+ "name": "VCC",+ "type": "power_in",+ "description": "Positive power supply input 3.3V, requires external 0.1µF decoupling capacitor."+ },+ {+ "number": "37",+ "name": "TXD7",+ "type": "output",+ "description": "UART7 serial data output, idle state high level."+ },+ {+ "number": "38",+ "name": "RXD7",+ "type": "input",+ "description": "UART7 serial data input, internal pull-up resistor, 5V tolerant."+ },+ {+ "number": "39",+ "name": "DTR3/TNOW3/GPIO11",+ "type": "bidirectional",+ "description": "UART3 Data Terminal Ready MODEM output signal active low; UART3 RS485 transmit/receive control pin; 5V tolerant; general purpose GPIO11 for input or output."+ },+ {+ "number": "40",+ "name": "TXD4",+ "type": "output",+ "description": "UART4 serial data output, idle state high level."+ },+ {+ "number": "41",+ "name": "RXD4",+ "type": "input",+ "description": "UART4 serial data input, internal pull-up resistor, 5V tolerant."+ },+ {+ "number": "42",+ "name": "UD-",+ "type": "passive",+ "description": "USB bus D- differential data signal, direct connection to USB connector without series resistor."+ },+ {+ "number": "43",+ "name": "UD+",+ "type": "passive",+ "description": "USB bus D+ differential data signal, direct connection to USB connector without series resistor."+ },+ {+ "number": "44",+ "name": "TEST",+ "type": "input",+ "description": "Internal test pin, recommend connecting 4.7kΩ pull-down resistor to ground or direct ground connection."+ },+ {+ "number": "45",+ "name": "TXD5",+ "type": "output",+ "description": "UART5 serial data output, idle state high level."+ },+ {+ "number": "46",+ "name": "RXD5",+ "type": "input",+ "description": "UART5 serial data input, internal pull-up resistor."+ },+ {+ "number": "47",+ "name": "GND",+ "type": "power_in",+ "description": "Common ground connection to USB bus ground."+ },+ {+ "number": "48",+ "name": "VCC",+ "type": "power_in",+ "description": "Positive power supply input 3.3V, requires external 0.1µF decoupling capacitor."+ }+ ],+ "provenance": {+ "extractor": "extract_pins 0.2",+ "factory_chain": {+ "factory": "2.0.0",+ "extractor": "extract_pins 0.2",+ "primary_model": "claude-haiku-4-5-20251001",+ "primary_mode": "text",+ "consensus_model": "claude-sonnet-4-6",+ "consensus": "agreed",+ "guards": "pin_guards 0.1: passed",+ "guard_notes": [],+ "pages_sent": 9,+ "cost_usd": 0.5808,+ "at": "2026-09-17T21:54:34"+ },+ "datasheet": {+ "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8589040309539901440",+ "pages": 9,+ "sha256": "df5440c74e6a0dfe",+ "source_tier": "lcsc"+ },+ "cad": "KiCad official (CC-BY-SA 4.0)",+ "pins": {+ "total": 48,+ "described": 48,+ "cites_pages": true,+ "refuses_to_fabricate": true+ }+ },+ "viewers": {+ "symbol": "viewers/symbol.html",+ "footprint": "viewers/footprint.html"+ }+ },+ "visibility": "public",+ "org": "adom",+ "author": {+ "name": "Ray",+ "email": "[email protected]"+ }+}