SI522A

{
  "schema_version": 1,
  "type": "component",
  "slug": "si522a",
  "title": "SI522A",
  "brief": "Nanjing Zhongke Microelectronics RFID ICs, QFN-32-EP(5x5). Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "rf and wireless",
    "si522a"
  ],
  "component": {
    "mpn": "SI522A",
    "manufacturer": "Nanjing Zhongke Microelectronics",
    "package": "QFN-32-EP(5x5)",
    "pin_count": 32,
    "category": "RF And Wireless",
    "subcategory": "RFID ICs",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588893164258136064",
    "parts": {
      "symbol": "si522a.kicad_sym",
      "footprint": "si522a.kicad_mod",
      "model_3d": "si522a-etched.glb",
      "model_3d_plain": "si522a.glb",
      "model_3d_step": "si522a-etched.step",
      "model_3d_step_plain": "si522a.step",
      "lbr": "si522a.lbr"
    },
    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "SDI",
        "type": "input",
        "description": "I2C bus input (mode-dependent function, see Chapter 8 Digital interface)."
      },
      {
        "number": "2",
        "name": "PVDD",
        "type": "power_in",
        "description": "Pad power supply. 2.5 V to 3.6 V; VDD(PVDD) must be equal to or smaller than VDDD."
      },
      {
        "number": "3",
        "name": "DVDD",
        "type": "power_in",
        "description": "Digital power supply. 2.5 V to 3.6 V; VDDA, VDDD, and VDD(TVDD) must be at the same voltage."
      },
      {
        "number": "4",
        "name": "DVSS",
        "type": "power_in",
        "description": "Digital ground (0 V reference for the digital core)."
      },
      {
        "number": "5",
        "name": "PVSS",
        "type": "power_in",
        "description": "Pad power supply ground (0 V return for PVDD)."
      },
      {
        "number": "6",
        "name": "NRSTPD",
        "type": "input",
        "description": "Not Reset and Power-Down. When LOW, internal current sinks are switched off, oscillator is inhibited, and input pads are disconnected from the outside world. A rising edge starts the internal reset phase."
      },
      {
        "number": "7",
        "name": "MFIN",
        "type": "input",
        "description": "Communication interface input; accepts a digital serial data stream (S2C / secondary interface)."
      },
      {
        "number": "8",
        "name": "MFOUT",
        "type": "output",
        "description": "Communication interface output; delivers a digital serial data stream (S2C / secondary interface)."
      },
      {
        "number": "9",
        "name": "SVDD",
        "type": "power_in",
        "description": "Provides power to the MFIN/MFOUT interface pads. 2.5 V to 3.6 V."
      },
      {
        "number": "10",
        "name": "TVSS",
        "type": "power_in",
        "description": "Transmitter ground; supplies the output stage of TX1 and TX2 (0 V return for the RF driver)."
      },
      {
        "number": "11",
        "name": "TX1",
        "type": "output",
        "description": "Transmitter 1: delivers the modulated 13.56 MHz energy carrier to drive the reader/writer antenna."
      },
      {
        "number": "12",
        "name": "TVDD",
        "type": "power_in",
        "description": "Transmitter power supply for the TX1/TX2 output stage. 2.5 V to 3.6 V; continuous-wave supply current ~20 mA typ (30 mA max)."
      },
      {
        "number": "13",
        "name": "TX2",
        "type": "output",
        "description": "Transmitter 2: delivers the modulated 13.56 MHz energy carrier to drive the reader/writer antenna (complementary/anti-phase driver)."
      },
      {
        "number": "14",
        "name": "TVSS",
        "type": "power_in",
        "description": "Transmitter ground; supplies the output stage of TX1 and TX2 (second TVSS pin for the RF driver return)."
      },
      {
        "number": "15",
        "name": "AVDD",
        "type": "power_in",
        "description": "Analog power supply. 2.5 V to 3.6 V; IDDA ~3 mA typ with receiver on, ~0.9 mA with receiver off."
      },
      {
        "number": "16",
        "name": "VMID",
        "type": "passive",
        "description": "Internal reference voltage output; requires an external decoupling capacitor to AVSS."
      },
      {
        "number": "17",
        "name": "RX",
        "type": "input",
        "description": "Receiver input; connects to the antenna receive path via an external RC network."
      },
      {
        "number": "18",
        "name": "AVSS",
        "type": "power_in",
        "description": "Analog ground (0 V reference for AVDD and the analog front-end)."
      },
      {
        "number": "19",
        "name": "AUX1",
        "type": "output",
        "description": "Auxiliary output; used for testing/analog test multiplexer output."
      },
      {
        "number": "20",
        "name": "AUX2",
        "type": "output",
        "description": "Auxiliary output; used for testing/analog test multiplexer output."
      },
      {
        "number": "21",
        "name": "OSCIN",
        "type": "input",
        "description": "Crystal oscillator input: input to the inverting amplifier of the oscillator. Also the input for an externally generated clock (fosc = 27.12 MHz)."
      },
      {
        "number": "22",
        "name": "OSCOUT",
        "type": "output",
        "description": "Crystal oscillator output: output of the inverting amplifier of the 27.12 MHz oscillator."
      },
      {
        "number": "23",
        "name": "IRQ",
        "type": "output",
        "description": "Interrupt request: output that signals an interrupt event to the host controller."
      },
      {
        "number": "24",
        "name": "SDA/NSS/RX",
        "type": "bidirectional",
        "description": "Muxed host-interface pin. I2C: SDA serial data. SPI: NSS chip-select input. UART: RX (address input for the UART configuration)."
      },
      {
        "number": "25",
        "name": "D1/ADR_5",
        "type": "bidirectional",
        "description": "Test port D1 in test mode, or I2C bus address bit 5 (ADR_5) in I2C mode."
      },
      {
        "number": "26",
        "name": "D2/ADR_4",
        "type": "bidirectional",
        "description": "Test port D2, or I2C bus address bit 4 (ADR_4) input."
      },
      {
        "number": "27",
        "name": "D3/ADR_3",
        "type": "bidirectional",
        "description": "Test port D3, or I2C bus address bit 3 (ADR_3) input."
      },
      {
        "number": "28",
        "name": "D4/ADR_2",
        "type": "bidirectional",
        "description": "Test port D4, or I2C bus address bit 2 (ADR_2) input."
      },
      {
        "number": "29",
        "name": "D5/ADR_1/SCK/DTRQ",
        "type": "bidirectional",
        "description": "Muxed host-interface pin. Test: D5. I2C: ADR_1 address bit 1. SPI: SCK serial clock input. UART: DTRQ (UART data-request output to controller)."
      },
      {
        "number": "30",
        "name": "D6/ADR_0/MOSI/MX",
        "type": "bidirectional",
        "description": "Muxed host-interface pin. Test: D6. I2C: ADR_0 address bit 0. SPI: MOSI (Master Out Slave In). UART: MX (UART output to controller)."
      },
      {
        "number": "31",
        "name": "D7/SCL/MISO/TX",
        "type": "bidirectional",
        "description": "Muxed host-interface pin. Test: D7. I2C: SCL clock. SPI: MISO (Master In Slave Out). UART: TX (UART data output to controller)."
      },
      {
        "number": "32",
        "name": "EA",
        "type": "input",
        "description": "External address input; can be used to define/enable the I2C address selection (tie to VDD or GND per host-interface configuration)."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588893164258136064",
        "pages": 109,
        "sha256": "dac9a4a2e0c08099",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 32,
        "described": 32,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "si522a.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          5.0,
          5.0,
          0.875
        ],
        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "5fa713ea46b36980895812ed853577889b7cb06d275041a39b99bc0be305dc79",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "si522a-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          5.0,
          5.0,
          0.875
        ],
        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "47199ab2a58ac5cac551799f20e755b7862b2285d5a0251914c98597835908ae",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Nanjing Zhongke Microelectronics",
      "Package": "QFN-32-EP(5x5)",
      "Category": "RF And Wireless",
      "Pins": "32"
    }
  },
  "variants": [],
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "si522a"
  ],
  "discovery_pitch": "SI522A (Nanjing Zhongke Microelectronics) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "si522a.kicad_sym",
    "si522a.kicad_mod",
    "si522a.glb",
    "si522a.step",
    "si522a.lbr",
    "docs/hero.png",
    "docs/si522a-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html"
  ],
  "visibility": {
    "public": true
  },
  "updated_at": "2026-09-25T05:58:38.220Z"
}