AFE4490RHAR

{
  "slug": "afe4490rhar",
  "version": "0.1.0",
  "type": "component",
  "description": "Texas Instruments Analog Front End (AFE), VQFN-40(6x6). Datasheet-verified pinout, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "data acquisition",
    "afe4490rhar",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "afe4490rhar.kicad_sym",
    "afe4490rhar.kicad_mod",
    "afe4490rhar.glb",
    "afe4490rhar.step",
    "afe4490rhar.lbr",
    "docs/hero.png",
    "docs/afe4490rhar-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html"
  ],
  "component": {
    "mpn": "AFE4490RHAR",
    "manufacturer": "Texas Instruments",
    "package": "VQFN-40(6x6)",
    "pin_count": 41,
    "category": "Data Acquisition",
    "subcategory": "Analog Front End (AFE)",
    "datasheet": "https://www.ti.com/cn/lit/gpn/afe4490",
    "parts": {
      "symbol": "afe4490rhar.kicad_sym",
      "footprint": "afe4490rhar.kicad_mod",
      "model_3d": "afe4490rhar-etched.glb",
      "model_3d_plain": "afe4490rhar.glb",
      "model_3d_step": "afe4490rhar-etched.step",
      "model_3d_step_plain": "afe4490rhar.step",
      "lbr": "afe4490rhar.lbr"
    },
    "distributor_links": {
      "lcsc": "C2651608"
    },
    "pins": [
      {
        "number": "1",
        "name": "INN",
        "type": "input",
        "description": "Receiver input pin to be connected to the photodiode anode."
      },
      {
        "number": "2",
        "name": "INP",
        "type": "input",
        "description": "Receiver input pin to be connected to the photodiode cathode."
      },
      {
        "number": "3",
        "name": "RX_ANA_GND",
        "type": "power_in",
        "description": "Rx analog supply ground to be connected to common board ground."
      },
      {
        "number": "4",
        "name": "VCM",
        "type": "output",
        "description": "Output common-mode voltage (0.9 V typ) to be routed through 1 kΩ series resistor and 10 nF capacitor to ground for shielding of INP and INN traces."
      },
      {
        "number": "5",
        "name": "DNC",
        "type": "unconnected",
        "description": "Do not connect; leave this pin as open-circuit."
      },
      {
        "number": "6",
        "name": "DNC",
        "type": "unconnected",
        "description": "Do not connect; leave this pin as open-circuit."
      },
      {
        "number": "7",
        "name": "BG",
        "type": "output",
        "description": "Bandgap voltage reference decoupling node requiring 2.2 µF capacitor to ground with expected voltage of 1.0 V."
      },
      {
        "number": "8",
        "name": "VSS",
        "type": "power_in",
        "description": "Substrate ground to be connected to common board ground."
      },
      {
        "number": "9",
        "name": "TX_REF",
        "type": "output",
        "description": "Transmitter reference voltage output (0.75 V default after reset) requiring 2.2 µF decoupling capacitor to ground."
      },
      {
        "number": "10",
        "name": "DNC",
        "type": "unconnected",
        "description": "Do not connect; leave this pin as open-circuit."
      },
      {
        "number": "11",
        "name": "TX_CTRL_SUP",
        "type": "power_in",
        "description": "Transmit controller supply input (3.0 V to 5.25 V) requiring 0.1 µF decoupling capacitor to ground."
      },
      {
        "number": "12",
        "name": "LED_DRV_GND",
        "type": "power_in",
        "description": "LED driver ground pin (H-bridge configuration) to be connected to common board ground."
      },
      {
        "number": "13",
        "name": "LED_DRV_GND",
        "type": "power_in",
        "description": "LED driver ground pin (H-bridge configuration) to be connected to common board ground."
      },
      {
        "number": "14",
        "name": "TXN",
        "type": "output",
        "description": "LED driver output B (H-bridge) with maximum output voltage not to exceed LED_DRV_SUP + 0.3 V."
      },
      {
        "number": "15",
        "name": "TXP",
        "type": "output",
        "description": "LED driver output A (H-bridge) with maximum output voltage not to exceed LED_DRV_SUP + 0.3 V."
      },
      {
        "number": "16",
        "name": "LED_DRV_GND",
        "type": "power_in",
        "description": "LED driver ground pin (H-bridge configuration) to be connected to common board ground."
      },
      {
        "number": "17",
        "name": "LED_DRV_SUP",
        "type": "power_in",
        "description": "LED driver supply input (3.0 V to 5.25 V depending on LED forward voltage) capable of supplying large LED drive current."
      },
      {
        "number": "18",
        "name": "LED_DRV_SUP",
        "type": "power_in",
        "description": "LED driver supply input (3.0 V to 5.25 V depending on LED forward voltage) capable of supplying large LED drive current."
      },
      {
        "number": "19",
        "name": "RX_DIG_GND",
        "type": "power_in",
        "description": "Rx digital supply ground to be connected to common board ground."
      },
      {
        "number": "20",
        "name": "AFE_PDN",
        "type": "input",
        "description": "AFE power-down control input (active low) to be connected to external microcontroller port pin."
      },
      {
        "number": "21",
        "name": "DIAG_END",
        "type": "output",
        "description": "Diagnostics completion output that pulses high at the end of each diagnostics sequence."
      },
      {
        "number": "22",
        "name": "LED_ALM",
        "type": "output",
        "description": "LED cable fault alarm output that indicates LED open or short condition."
      },
      {
        "number": "23",
        "name": "PD_ALM/ADC_Reset",
        "type": "output",
        "description": "Photodiode fault alarm output that indicates PD sensor or cable fault, with optional ADC reset signal in bypass mode."
      },
      {
        "number": "24",
        "name": "SCLK",
        "type": "input",
        "description": "SPI serial clock input for driving data shifting at frequencies up to 16 MHz."
      },
      {
        "number": "25",
        "name": "SPISOMI",
        "type": "output",
        "description": "SPI serial output (master in, slave out) with tri-state capability for outputting register contents during read operations."
      },
      {
        "number": "26",
        "name": "SPISIMO",
        "type": "input",
        "description": "SPI serial input (master out, slave in) for accepting register address and write data during SPI write operations."
      },
      {
        "number": "27",
        "name": "SPISTE",
        "type": "input",
        "description": "SPI chip select input (active low) that enables serial data latching on SCLK rising edges."
      },
      {
        "number": "28",
        "name": "ADC_RDY",
        "type": "output",
        "description": "ADC data ready output that pulses high when new ADC conversion results are available."
      },
      {
        "number": "29",
        "name": "RESET",
        "type": "input",
        "description": "AFE reset input (active low) requiring minimum 0.5 ms low pulse after supply ramp and stabilization."
      },
      {
        "number": "30",
        "name": "CLKOUT",
        "type": "output",
        "description": "Buffered 4-MHz clock output derived from the internal 8-MHz oscillator divided by 2."
      },
      {
        "number": "31",
        "name": "RX_DIG_SUP",
        "type": "power_in",
        "description": "Rx digital supply input (2.0 V to 3.6 V) requiring 0.1 µF decoupling capacitor to ground."
      },
      {
        "number": "32",
        "name": "RX_DIG_GND",
        "type": "power_in",
        "description": "Rx digital supply ground to be connected to common board ground."
      },
      {
        "number": "33",
        "name": "RX_ANA_SUP",
        "type": "power_in",
        "description": "Rx analog supply input (2.0 V to 3.6 V) requiring 0.1 µF decoupling capacitor to ground."
      },
      {
        "number": "34",
        "name": "RXOUTN",
        "type": "output",
        "description": "External ADC negative input that outputs filtered analog signal in ADC bypass mode with 0.9 V common mode."
      },
      {
        "number": "35",
        "name": "RXOUTP",
        "type": "output",
        "description": "External ADC positive input that outputs filtered analog signal in ADC bypass mode with 0.9 V common mode."
      },
      {
        "number": "36",
        "name": "RX_ANA_GND",
        "type": "power_in",
        "description": "Rx analog supply ground to be connected to common board ground."
      },
      {
        "number": "37",
        "name": "XOUT",
        "type": "passive",
        "description": "Crystal oscillator output pin for connecting external 8-MHz crystal with appropriate load capacitor as specified by crystal vendor."
      },
      {
        "number": "38",
        "name": "XIN",
        "type": "passive",
        "description": "Crystal oscillator input pin for connecting external 8-MHz crystal with appropriate load capacitor as specified by crystal vendor."
      },
      {
        "number": "39",
        "name": "RX_ANA_SUP",
        "type": "power_in",
        "description": "Rx analog supply input (2.0 V to 3.6 V) requiring 0.1 µF decoupling capacitor to ground."
      },
      {
        "number": "40",
        "name": "RX_ANA_GND",
        "type": "power_in",
        "description": "Rx analog supply ground to be connected to common board ground."
      },
      {
        "number": "41",
        "name": "EP",
        "type": "passive",
        "description": "Exposed pad (from the footprint; not named in the datasheet pin table)."
      }
    ],
    "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": [
          "exposed pad 41 added from the footprint"
        ],
        "pages_sent": 98,
        "cost_usd": 0.9374,
        "at": "2026-09-21T15:45:36"
      },
      "datasheet": {
        "url": "https://www.ti.com/cn/lit/gpn/afe4490",
        "pages": 98,
        "sha256": "d022ff9bb44482b0",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 41,
        "described": 41,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "afe4490rhar.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.0,
          6.0,
          1.0
        ],
        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "e5b4286c2329085d9ef7f90d5eb5bf41a435241ecc1baaf1383823b6d6a946ae",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "afe4490rhar-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.0,
          6.0,
          1.0
        ],
        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "04c222aa59bfb93c45990b7f2be83ab0f9982876d5c3de8f8a95d7e097cbcad3",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  }
}