CH546L

{
  "schema_version": 1,
  "type": "component",
  "slug": "ch546l",
  "title": "CH546L",
  "brief": "WCH(Jiangsu Qin Heng) Pre-ordered Products, LQFP-48(7x7). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "solders - accessories - batteries",
    "ch546l",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "CH546L",
    "manufacturer": "WCH(Jiangsu Qin Heng)",
    "package": "LQFP-48(7x7)",
    "pin_count": 48,
    "category": "Solders / Accessories / Batteries",
    "subcategory": "Pre-ordered Products",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/0a72d6434bc86a0593ae5a83e875605a.pdf",
    "parts": {
      "symbol": "ch546l.kicad_sym",
      "footprint": "ch546l.kicad_mod",
      "model_3d": "ch546l-hero.glb",
      "model_3d_plain": "ch546l-etched.glb",
      "model_3d_step": "ch546l-etched.step",
      "model_3d_step_plain": "ch546l.step",
      "lbr": "ch546l.lbr"
    },
    "distributor_links": {
      "lcsc": "C2923468"
    },
    "distributor_check": {
      "checked_at": "2026-10-23T18:13:00Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "deferred",
        "error": "shared DigiKey quota guard: 887 calls left today"
      },
      "mouser": {
        "pn": null,
        "status": "quota"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "P1.6",
        "type": "bidirectional",
        "description": "GPIO P1.6 with SPI0 MISO and ADC/touch-key input AIN6 on the CH546L."
      },
      {
        "number": "2",
        "name": "P1.7",
        "type": "bidirectional",
        "description": "GPIO P1.7 with SPI0 SCK and ADC/touch-key input AIN7."
      },
      {
        "number": "3",
        "name": "P5.7/RST",
        "type": "input",
        "description": "External reset input with built-in pull-down resistor; also GPIO input P5.7 (RST enabled by En_P5.7_RESET configuration bit)."
      },
      {
        "number": "4",
        "name": "P3.0/RXD",
        "type": "bidirectional",
        "description": "GPIO P3.0 with UART0 serial data input RXD."
      },
      {
        "number": "5",
        "name": "P4.5",
        "type": "bidirectional",
        "description": "General-purpose I/O P4.5."
      },
      {
        "number": "6",
        "name": "P4.4",
        "type": "bidirectional",
        "description": "General-purpose I/O P4.4."
      },
      {
        "number": "7",
        "name": "P3.1/TXD",
        "type": "bidirectional",
        "description": "GPIO P3.1 with UART0 serial data output TXD."
      },
      {
        "number": "8",
        "name": "P3.2/INT0",
        "type": "bidirectional",
        "description": "GPIO P3.2 with external interrupt 0 input INT0."
      },
      {
        "number": "9",
        "name": "P3.3/INT1",
        "type": "bidirectional",
        "description": "GPIO P3.3 with external interrupt 1 input INT1."
      },
      {
        "number": "10",
        "name": "P3.4/T0",
        "type": "bidirectional",
        "description": "GPIO P3.4 with Timer0 external input T0."
      },
      {
        "number": "11",
        "name": "P3.5/T1",
        "type": "bidirectional",
        "description": "GPIO P3.5 with Timer1 external input T1."
      },
      {
        "number": "12",
        "name": "P3.6",
        "type": "bidirectional",
        "description": "General-purpose I/O P3.6."
      },
      {
        "number": "13",
        "name": "P3.7/INT3",
        "type": "bidirectional",
        "description": "GPIO P3.7 with external interrupt 3 input INT3."
      },
      {
        "number": "14",
        "name": "P4.3",
        "type": "bidirectional",
        "description": "General-purpose I/O P4.3."
      },
      {
        "number": "15",
        "name": "P4.2",
        "type": "bidirectional",
        "description": "General-purpose I/O P4.2."
      },
      {
        "number": "16",
        "name": "P4.6/XI",
        "type": "bidirectional",
        "description": "GPIO P4.6 or external crystal oscillator input XI (also external clock input, with XO left floating)."
      },
      {
        "number": "17",
        "name": "XO",
        "type": "output",
        "description": "External crystal oscillator inverting output; leave floating when an external clock is fed into XI."
      },
      {
        "number": "18",
        "name": "GND",
        "type": "power_in",
        "description": "Common ground (VSS)."
      },
      {
        "number": "19",
        "name": "P4.1",
        "type": "bidirectional",
        "description": "General-purpose I/O P4.1."
      },
      {
        "number": "20",
        "name": "P4.0",
        "type": "bidirectional",
        "description": "General-purpose I/O P4.0."
      },
      {
        "number": "21",
        "name": "P2.0",
        "type": "bidirectional",
        "description": "General-purpose I/O P2.0."
      },
      {
        "number": "22",
        "name": "P2.1",
        "type": "bidirectional",
        "description": "General-purpose I/O P2.1."
      },
      {
        "number": "23",
        "name": "P2.2/INT0_",
        "type": "bidirectional",
        "description": "GPIO P2.2 with INT0 pin-mapping alternate (INT0_); PWM3 is not available on CH546L."
      },
      {
        "number": "24",
        "name": "P2.3",
        "type": "bidirectional",
        "description": "General-purpose I/O P2.3."
      },
      {
        "number": "25",
        "name": "P2.4/PWM1/T2_",
        "type": "bidirectional",
        "description": "GPIO P2.4 with PWM1 output and T2 pin-mapping alternate (T2_)."
      },
      {
        "number": "26",
        "name": "P2.5/PWM0/T2EX_/CAP2_",
        "type": "bidirectional",
        "description": "GPIO P2.5 with PWM0 output and T2EX/CAP2 pin-mapping alternates (T2EX_/CAP2_)."
      },
      {
        "number": "27",
        "name": "P2.6",
        "type": "bidirectional",
        "description": "General-purpose I/O P2.6 (UART1 not available on CH546L)."
      },
      {
        "number": "28",
        "name": "P2.7",
        "type": "bidirectional",
        "description": "General-purpose I/O P2.7 (UART1 not available on CH546L)."
      },
      {
        "number": "29",
        "name": "P5.5/HVOD",
        "type": "output",
        "description": "Open-drain output P5.5 supporting up to 12V high-voltage pull-up (HVOD)."
      },
      {
        "number": "30",
        "name": "P5.4/ALE/CKO",
        "type": "output",
        "description": "Output P5.4 providing pseudo address latch ALE or divided system clock output CKO."
      },
      {
        "number": "31",
        "name": "P5.1/DP",
        "type": "bidirectional",
        "description": "USB device D+ signal (UDP) with built-in resistor, no external series resistor recommended; also P5.1 with controllable pull-down."
      },
      {
        "number": "32",
        "name": "P5.0/DM",
        "type": "bidirectional",
        "description": "USB device D- signal (UDM) with built-in resistor, no external series resistor recommended; also P5.0 with controllable pull-down."
      },
      {
        "number": "33",
        "name": "P0.7",
        "type": "bidirectional",
        "description": "General-purpose I/O P0.7."
      },
      {
        "number": "34",
        "name": "P0.6",
        "type": "bidirectional",
        "description": "General-purpose I/O P0.6."
      },
      {
        "number": "35",
        "name": "P0.5",
        "type": "bidirectional",
        "description": "General-purpose I/O P0.5."
      },
      {
        "number": "36",
        "name": "P0.4",
        "type": "bidirectional",
        "description": "General-purpose I/O P0.4."
      },
      {
        "number": "37",
        "name": "P0.3/TXD_",
        "type": "bidirectional",
        "description": "GPIO P0.3 with UART0 TXD pin-mapping alternate (TXD_)."
      },
      {
        "number": "38",
        "name": "P0.2/RXD_",
        "type": "bidirectional",
        "description": "GPIO P0.2 with UART0 RXD pin-mapping alternate (RXD_)."
      },
      {
        "number": "39",
        "name": "P0.1",
        "type": "bidirectional",
        "description": "General-purpose I/O P0.1."
      },
      {
        "number": "40",
        "name": "P0.0",
        "type": "bidirectional",
        "description": "General-purpose I/O P0.0."
      },
      {
        "number": "41",
        "name": "VDD",
        "type": "power_in",
        "description": "I/O supply input and external supply input of the internal USB regulator (2.8V to 5V range per datasheet); requires a 0.1uF decoupling capacitor."
      },
      {
        "number": "42",
        "name": "V33",
        "type": "passive",
        "description": "Internal USB regulator output and USB supply input; connect to VDD when supply is below 3.6V, otherwise connect a 0.1uF decoupling capacitor."
      },
      {
        "number": "43",
        "name": "P1.0/T2/AIN0",
        "type": "bidirectional",
        "description": "GPIO P1.0 with Timer2 external input/clock output T2 and ADC/touch-key input AIN0."
      },
      {
        "number": "44",
        "name": "P1.1/T2EX/CAP2/AIN1",
        "type": "bidirectional",
        "description": "GPIO P1.1 with Timer2 reload/capture input T2EX/CAP2 and ADC/touch-key input AIN1."
      },
      {
        "number": "45",
        "name": "P1.2/AIN2",
        "type": "bidirectional",
        "description": "GPIO P1.2 with ADC/touch-key input AIN2."
      },
      {
        "number": "46",
        "name": "P1.3/AIN3",
        "type": "bidirectional",
        "description": "GPIO P1.3 with ADC/touch-key input AIN3."
      },
      {
        "number": "47",
        "name": "P1.4/SCS/AIN4",
        "type": "bidirectional",
        "description": "GPIO P1.4 with SPI0 chip-select input SCS and ADC/touch-key input AIN4."
      },
      {
        "number": "48",
        "name": "P1.5/MOSI/PWM0_/AIN5",
        "type": "bidirectional",
        "description": "GPIO P1.5 with SPI0 MOSI, PWM0 pin-mapping alternate (PWM0_) and ADC/touch-key input AIN5."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
      "factory_chain": {
        "factory": "2.0.0",
        "extractor": "extract_pins 0.3",
        "primary_model": "claude-sonnet-5-5",
        "primary_mode": "text",
        "consensus_model": "claude-sonnet-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: The datasheet is a shared CH547/CH546 manual. Pin names and functions for CH546L come from its own p; The CH546L diagram shows P0.2/RXD_ and P0.3/TXD_ without AIN10/AIN11, consistent with the 8-channel ; The pin type for V33 (internal regulator output or USB supply input) and for P5.5/P5.4 (output-only ",
          "1/48 pins cited to the wrong page (name found elsewhere): ['17:XO@p4']"
        ],
        "pages_sent": 55,
        "cost_usd": 0.6573,
        "at": "2026-10-23T18:12:43"
      },
      "datasheet": {
        "url": "https://datasheet.lcsc.com/datasheet/pdf/0a72d6434bc86a0593ae5a83e875605a.pdf",
        "pages": 61,
        "sha256": "da4affda6c33d6a6",
        "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"
    },
    "models_3d": [
      {
        "file": "ch546l.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          9,
          9,
          1.5
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "9dea352d93177c2904afd7d7b68ea8855ce1ab691f69f8b3e13655600514b6bf",
        "checked": "2026-10-23",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "ch546l-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          9,
          9,
          1.5
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "45a085c19cbc31158b1ef36e25898f4541744f0945204a83f8023e8e71b42f24",
        "checked": "2026-10-23",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "WCH(Jiangsu Qin Heng)",
      "Package": "LQFP-48(7x7)",
      "Category": "Solders / Accessories / Batteries",
      "Pins": "48"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "da4affda6c33d6a6805b9564a39f2398b5afdf24fa486c82ed120d9293fedf21",
      "rows": [
        {
          "name": "Operating ambient temperature",
          "symbol": "TA",
          "kind": "absolute_maximum",
          "unit": "℃",
          "min": -40,
          "typ": null,
          "max": 85,
          "conditions": "Fsys<40MHz",
          "source_page": 58,
          "source": "datasheet"
        },
        {
          "name": "Ambient temperature for Flash-ROM/EEPROM erase/program (recommended)",
          "symbol": "TAROM",
          "kind": "recommended_operating",
          "unit": "℃",
          "min": -20,
          "typ": null,
          "max": 85,
          "conditions": "",
          "source_page": 58,
          "source": "datasheet"
        },
        {
          "name": "Storage temperature",
          "symbol": "TS",
          "kind": "absolute_maximum",
          "unit": "℃",
          "min": -55,
          "typ": null,
          "max": 125,
          "conditions": "",
          "source_page": 58,
          "source": "datasheet"
        },
        {
          "name": "Supply voltage",
          "symbol": "VDD",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.4,
          "typ": null,
          "max": 7,
          "conditions": "VDD to supply, GND to ground",
          "source_page": 58,
          "source": "datasheet"
        },
        {
          "name": "Internal USB supply voltage",
          "symbol": "V33",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.4,
          "typ": null,
          "max": null,
          "conditions": "max printed as VDD+0.4",
          "source_page": 58,
          "source": "datasheet"
        },
        {
          "name": "Voltage on input or output pin",
          "symbol": "VIO",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.4,
          "typ": null,
          "max": null,
          "conditions": "max printed as VDD+0.4",
          "source_page": 58,
          "source": "datasheet"
        },
        {
          "name": "Voltage on UDP/UDM pins",
          "symbol": "VIOU",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.4,
          "typ": null,
          "max": null,
          "conditions": "max printed as V33+0.4",
          "source_page": 58,
          "source": "datasheet"
        },
        {
          "name": "Voltage on P5.5/HVOD pin",
          "symbol": "VIOHV",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.4,
          "typ": null,
          "max": 13,
          "conditions": "",
          "source_page": 58,
          "source": "datasheet"
        },
        {
          "name": "VDD supply voltage (5V mode)",
          "symbol": "VDD5",
          "kind": "electrical",
          "unit": "V",
          "min": 3.7,
          "typ": 5,
          "max": 6.5,
          "conditions": "V33 external capacitor only; TA=25℃, VDD=5V, Fsys=12MHz",
          "source_page": 58,
          "source": "datasheet"
        },
        {
          "name": "Internal regulator output voltage",
          "symbol": "V33",
          "kind": "electrical",
          "unit": "V",
          "min": 3.23,
          "typ": 3.3,
          "max": 3.38,
          "conditions": "TA=-15～65℃",
          "source_page": 58,
          "source": "datasheet"
        },
        {
          "name": "Internal regulator output voltage",
          "symbol": "V33",
          "kind": "electrical",
          "unit": "V",
          "min": 3.2,
          "typ": 3.3,
          "max": 3.4,
          "conditions": "TA=-40～85℃",
          "source_page": 58,
          "source": "datasheet"
        },
        {
          "name": "Standby/normal sleep supply current 5V",
          "symbol": "ISLP5",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": 1.1,
          "max": 1.5,
          "conditions": "",
          "source_page": 58,
          "source": "datasheet"
        },
        {
          "name": "Power-down/deep sleep supply current 5V",
          "symbol": "ISLP5L",
          "kind": "electrical",
          "unit": "uA",
          "min": null,
          "typ": 4,
          "max": 40,
          "conditions": "bLDO_3V3_OFF=1",
          "source_page": 58,
          "source": "datasheet"
        },
        {
          "name": "ADC operating current 5V",
          "symbol": "IADC5",
          "kind": "electrical",
          "unit": "uA",
          "min": null,
          "typ": 200,
          "max": 800,
          "conditions": "",
          "source_page": 58,
          "source": "datasheet"
        },
        {
          "name": "Comparator operating current 5V",
          "symbol": "ICMP5",
          "kind": "electrical",
          "unit": "uA",
          "min": null,
          "typ": 100,
          "max": 500,
          "conditions": "",
          "source_page": 58,
          "source": "datasheet"
        },
        {
          "name": "Touch-key charge current 5V",
          "symbol": "ITKEY5",
          "kind": "electrical",
          "unit": "uA",
          "min": 35,
          "typ": 50,
          "max": 70,
          "conditions": "",
          "source_page": 58,
          "source": "datasheet"
        },
        {
          "name": "Low-level input voltage 5V",
          "symbol": "VIL5",
          "kind": "electrical",
          "unit": "V",
          "min": 0,
          "typ": null,
          "max": 1.2,
          "conditions": "",
          "source_page": 58,
          "source": "datasheet"
        },
        {
          "name": "High-level input voltage 5V",
          "symbol": "VIH5",
          "kind": "electrical",
          "unit": "V",
          "min": 2.4,
          "typ": null,
          "max": null,
          "conditions": "max printed as VDD",
          "source_page": 58,
          "source": "datasheet"
        },
        {
          "name": "Low-level output voltage 5V",
          "symbol": "VOL5",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 0.4,
          "conditions": "15mA sink current",
          "source_page": 58,
          "source": "datasheet"
        },
        {
          "name": "P5.5/HVOD pin voltage (no output/high-Z)",
          "symbol": "VHVOD",
          "kind": "electrical",
          "unit": "V",
          "min": 0,
          "typ": 12,
          "max": 12.6,
          "conditions": "VDD=5V",
          "source_page": 58,
          "source": "datasheet"
        },
        {
          "name": "Input current, no pull-up input",
          "symbol": "IIN",
          "kind": "electrical",
          "unit": "uA",
          "min": -5,
          "typ": 0,
          "max": 5,
          "conditions": "",
          "source_page": 58,
          "source": "datasheet"
        },
        {
          "name": "Input current with pull-down 5V",
          "symbol": "IDN5",
          "kind": "electrical",
          "unit": "uA",
          "min": -35,
          "typ": -70,
          "max": -140,
          "conditions": "",
          "source_page": 58,
          "source": "datasheet"
        },
        {
          "name": "Input current with pull-up 5V",
          "symbol": "IUP5",
          "kind": "electrical",
          "unit": "uA",
          "min": 35,
          "typ": 70,
          "max": 140,
          "conditions": "",
          "source_page": 58,
          "source": "datasheet"
        },
        {
          "name": "Input current with pull-up, low-to-high transition 5V",
          "symbol": "IUP5X",
          "kind": "electrical",
          "unit": "uA",
          "min": 250,
          "typ": 400,
          "max": 600,
          "conditions": "",
          "source_page": 58,
          "source": "datasheet"
        },
        {
          "name": "Analog switch on-resistance 5V",
          "symbol": "Rsw5",
          "kind": "electrical",
          "unit": "Ω",
          "min": 500,
          "typ": 700,
          "max": 1350,
          "conditions": "",
          "source_page": 58,
          "source": "datasheet"
        },
        {
          "name": "Power-on reset threshold 5V",
          "symbol": "Vpot",
          "kind": "electrical",
          "unit": "V",
          "min": 2.3,
          "typ": 4,
          "max": 4.6,
          "conditions": "VDD=5V",
          "source_page": 59,
          "source": "datasheet"
        },
        {
          "name": "VDD supply voltage (3.3V mode, USB on)",
          "symbol": "VDD3",
          "kind": "electrical",
          "unit": "V",
          "min": 3,
          "typ": 3.3,
          "max": 3.6,
          "conditions": "V33 shorted to VDD, USB enabled",
          "source_page": 59,
          "source": "datasheet"
        },
        {
          "name": "VDD supply voltage (3.3V mode, USB off)",
          "symbol": "VDD3",
          "kind": "electrical",
          "unit": "V",
          "min": 2.7,
          "typ": 3.3,
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