ATMEGA16A-AU

{
  "schema_version": 1,
  "type": "component",
  "slug": "atmega16a-au",
  "title": "ATMEGA16A-AU",
  "brief": "Microchip Microcontrollers (MCU/MPU/SOC), TQFP-44(10x10). Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "mcu",
    "atmega16a-au"
  ],
  "component": {
    "mpn": "ATMEGA16A-AU",
    "manufacturer": "Microchip",
    "package": "TQFP-44(10x10)",
    "pin_count": 44,
    "category": "MCU",
    "subcategory": "Microcontrollers (MCU/MPU/SOC)",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/5384e31041f2442dbb3b2395565c597b.pdf",
    "parts": {
      "symbol": "atmega16a-au.kicad_sym",
      "footprint": "atmega16a-au.kicad_mod",
      "model_3d": "atmega16a-au-etched.glb",
      "model_3d_plain": "atmega16a-au.glb",
      "model_3d_step": "atmega16a-au-etched.step",
      "model_3d_step_plain": "atmega16a-au.step",
      "lbr": "atmega16a-au.lbr"
    },
    "distributor_links": {
      "digikey": "ATMEGA16A-AU-ND",
      "lcsc": "C5658"
    },
    "pins": [
      {
        "number": "1",
        "name": "PB5/MOSI",
        "type": "bidirectional",
        "description": "Port B bit 5. Alternate function: SPI bus Master-Out-Slave-In. Also serves as slave data input during serial programming."
      },
      {
        "number": "2",
        "name": "PB6/MISO",
        "type": "bidirectional",
        "description": "Port B bit 6. Alternate function: SPI bus Master-In-Slave-Out. Also serves as slave data output during serial programming."
      },
      {
        "number": "3",
        "name": "PB7/SCK",
        "type": "bidirectional",
        "description": "Port B bit 7. Alternate function: SPI bus serial clock. Also serves as clock during serial programming."
      },
      {
        "number": "4",
        "name": "RESET",
        "type": "input",
        "description": "Active-low external reset input. A low level longer than the minimum pulse (see datasheet spec) generates a reset even if the clock is not running."
      },
      {
        "number": "5",
        "name": "VCC",
        "type": "power_in",
        "description": "Digital supply voltage, 2.7-5.5 V."
      },
      {
        "number": "6",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference (0 V)."
      },
      {
        "number": "7",
        "name": "XTAL2",
        "type": "output",
        "description": "Output from the inverting oscillator amplifier. Connect to the far side of an external crystal/resonator across XTAL1-XTAL2."
      },
      {
        "number": "8",
        "name": "XTAL1",
        "type": "input",
        "description": "Input to the inverting oscillator amplifier and internal clock operating circuit. Also the external clock input when using an external clock source."
      },
      {
        "number": "9",
        "name": "PD0/RXD",
        "type": "bidirectional",
        "description": "Port D bit 0. Alternate function: USART receive data input."
      },
      {
        "number": "10",
        "name": "PD1/TXD",
        "type": "bidirectional",
        "description": "Port D bit 1. Alternate function: USART transmit data output."
      },
      {
        "number": "11",
        "name": "PD2/INT0",
        "type": "bidirectional",
        "description": "Port D bit 2. Alternate function: External interrupt source 0 (INT0)."
      },
      {
        "number": "12",
        "name": "PD3/INT1",
        "type": "bidirectional",
        "description": "Port D bit 3. Alternate function: External interrupt source 1 (INT1)."
      },
      {
        "number": "13",
        "name": "PD4/OC1B",
        "type": "bidirectional",
        "description": "Port D bit 4. Alternate function: Timer/Counter1 Output Compare B match output (OC1B), typically used for PWM."
      },
      {
        "number": "14",
        "name": "PD5/OC1A",
        "type": "bidirectional",
        "description": "Port D bit 5. Alternate function: Timer/Counter1 Output Compare A match output (OC1A), typically used for PWM."
      },
      {
        "number": "15",
        "name": "PD6/ICP1",
        "type": "bidirectional",
        "description": "Port D bit 6. Alternate function: Timer/Counter1 Input Capture pin (ICP1)."
      },
      {
        "number": "16",
        "name": "PD7/OC2",
        "type": "bidirectional",
        "description": "Port D bit 7. Alternate function: Timer/Counter2 Output Compare match output (OC2), typically used for PWM."
      },
      {
        "number": "17",
        "name": "VCC",
        "type": "power_in",
        "description": "Digital supply voltage (second VCC pin on TQFP package). Bypass locally with 100 nF."
      },
      {
        "number": "18",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference (second GND pin on TQFP package)."
      },
      {
        "number": "19",
        "name": "PC0/SCL",
        "type": "bidirectional",
        "description": "Port C bit 0. Alternate function: Two-wire Serial Interface clock line (SCL). Requires an external pull-up resistor when used as TWI."
      },
      {
        "number": "20",
        "name": "PC1/SDA",
        "type": "bidirectional",
        "description": "Port C bit 1. Alternate function: Two-wire Serial Interface data line (SDA). Requires an external pull-up resistor when used as TWI."
      },
      {
        "number": "21",
        "name": "PC2/TCK",
        "type": "bidirectional",
        "description": "Port C bit 2. Alternate function: JTAG Test Clock (TCK). Held by JTAG when the JTAGEN fuse is programmed."
      },
      {
        "number": "22",
        "name": "PC3/TMS",
        "type": "bidirectional",
        "description": "Port C bit 3. Alternate function: JTAG Test Mode Select (TMS)."
      },
      {
        "number": "23",
        "name": "PC4/TDO",
        "type": "bidirectional",
        "description": "Port C bit 4. Alternate function: JTAG Test Data Out (TDO)."
      },
      {
        "number": "24",
        "name": "PC5/TDI",
        "type": "bidirectional",
        "description": "Port C bit 5. Alternate function: JTAG Test Data In (TDI)."
      },
      {
        "number": "25",
        "name": "PC6/TOSC1",
        "type": "bidirectional",
        "description": "Port C bit 6. Alternate function: Timer Oscillator pin 1 (TOSC1) for the asynchronous Timer/Counter2 when driven by an external 32.768 kHz watch crystal."
      },
      {
        "number": "26",
        "name": "PC7/TOSC2",
        "type": "bidirectional",
        "description": "Port C bit 7. Alternate function: Timer Oscillator pin 2 (TOSC2) for the asynchronous Timer/Counter2."
      },
      {
        "number": "27",
        "name": "AVCC",
        "type": "power_in",
        "description": "Analog supply pin for Port A and the ADC. Should be connected to VCC through a filter (typically an LC network) even when the ADC is not used; must not differ from VCC by more than ±0.3 V."
      },
      {
        "number": "28",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference (analog GND on TQFP package)."
      },
      {
        "number": "29",
        "name": "AREF",
        "type": "passive",
        "description": "Analog reference input pin for the A/D converter. Decouple with a capacitor to GND (typically 100 nF); may be driven externally or configured internally."
      },
      {
        "number": "30",
        "name": "PA7/ADC7",
        "type": "bidirectional",
        "description": "Port A bit 7 / ADC channel 7 input. When the ADC is enabled the pin operates as an analog input; otherwise it is a general-purpose digital I/O."
      },
      {
        "number": "31",
        "name": "PA6/ADC6",
        "type": "bidirectional",
        "description": "Port A bit 6 / ADC channel 6 input."
      },
      {
        "number": "32",
        "name": "PA5/ADC5",
        "type": "bidirectional",
        "description": "Port A bit 5 / ADC channel 5 input."
      },
      {
        "number": "33",
        "name": "PA4/ADC4",
        "type": "bidirectional",
        "description": "Port A bit 4 / ADC channel 4 input."
      },
      {
        "number": "34",
        "name": "PA3/ADC3",
        "type": "bidirectional",
        "description": "Port A bit 3 / ADC channel 3 input."
      },
      {
        "number": "35",
        "name": "PA2/ADC2",
        "type": "bidirectional",
        "description": "Port A bit 2 / ADC channel 2 input."
      },
      {
        "number": "36",
        "name": "PA1/ADC1",
        "type": "bidirectional",
        "description": "Port A bit 1 / ADC channel 1 input."
      },
      {
        "number": "37",
        "name": "PA0/ADC0",
        "type": "bidirectional",
        "description": "Port A bit 0 / ADC channel 0 input."
      },
      {
        "number": "38",
        "name": "VCC",
        "type": "power_in",
        "description": "Digital supply voltage (third VCC pin on TQFP package)."
      },
      {
        "number": "39",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference (third GND pin on TQFP package)."
      },
      {
        "number": "40",
        "name": "PB0/XCK/T0",
        "type": "bidirectional",
        "description": "Port B bit 0. Alternate functions: USART external clock (XCK) and Timer/Counter0 external clock input (T0)."
      },
      {
        "number": "41",
        "name": "PB1/T1",
        "type": "bidirectional",
        "description": "Port B bit 1. Alternate function: Timer/Counter1 external clock input (T1)."
      },
      {
        "number": "42",
        "name": "PB2/AIN0/INT2",
        "type": "bidirectional",
        "description": "Port B bit 2. Alternate functions: Analog comparator positive input (AIN0) and external interrupt source 2 (INT2)."
      },
      {
        "number": "43",
        "name": "PB3/AIN1/OC0",
        "type": "bidirectional",
        "description": "Port B bit 3. Alternate functions: Analog comparator negative input (AIN1) and Timer/Counter0 Output Compare match output (OC0), typically used for PWM."
      },
      {
        "number": "44",
        "name": "PB4/SS",
        "type": "bidirectional",
        "description": "Port B bit 4. Alternate function: SPI slave select input (SS, active low). Must be held high when the SPI is configured as master unless driven as an output."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://datasheet.lcsc.com/datasheet/pdf/5384e31041f2442dbb3b2395565c597b.pdf",
        "pages": 19,
        "sha256": "191fad2628376ab8",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 44,
        "described": 44,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "pin1": {
      "pad": "1",
      "at": [
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        -4
      ],
      "corner": "top-left",
      "source": "silk-marker",
      "derived_from": "LQFP-44_10x10mm_P0.8mm@sha256:a24003d5101dbf25",
      "mark": "drawn"
    },
    "models_3d": [
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        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
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        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "81aae6270b5c742bed79a8a35e9adf7fbed97c42e341e6b25ab20c1783b93b5d",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
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      {
        "file": "atmega16a-au-etched.step",
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      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Microchip",
      "Package": "TQFP-44(10x10)",
      "Category": "MCU",
      "Pins": "44"
    }
  },
  "sections": [
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    "readme",
    "breadcrumbs",
    "info"
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  "discovery_triggers": [
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  "discovery_pitch": "ATMEGA16A-AU (Microchip) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray"
  },
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  "updated_at": "2026-09-24T17:17:45.817Z"
}