Network cabinet fan controller

[
  {
    "id": "vin_raw",
    "net": "VIN_RAW",
    "what": "VIN_RAW",
    "why": "11.4\u201312.6 V assumed regulated input",
    "kind": "dc",
    "expect": "11.4\u201312.6 V assumed regulated input",
    "layer": "B.Cu"
  },
  {
    "id": "vin12",
    "net": "VIN12",
    "what": "VIN12",
    "why": "VIN_RAW minus fuse and reverse-polarity path drop",
    "kind": "dc",
    "expect": "VIN_RAW minus fuse and reverse-polarity path drop",
    "layer": "B.Cu"
  },
  {
    "id": "v3v3",
    "net": "V3V3",
    "what": "V3V3",
    "why": "3.3 V nominal; 3.0\u20133.6 V always; target ripple <50 mVpp at module",
    "kind": "ripple",
    "expect": "3.3 V nominal; 3.0\u20133.6 V always; target ripple <50 mVpp at module",
    "layer": "B.Cu"
  },
  {
    "id": "sw",
    "net": "SW",
    "what": "SW",
    "why": "1.1 MHz typical in CCM; no prolonged ringing outside regulator limits",
    "kind": "waveform",
    "expect": "1.1 MHz typical in CCM; no prolonged ringing outside regulator limits",
    "layer": "F.Cu"
  },
  {
    "id": "pwm1",
    "net": "PWM1",
    "what": "PWM1",
    "why": "25 kHz, high >=2.1 V, low <=0.8 V, at 25/50/100%",
    "kind": "waveform",
    "expect": "25 kHz, high >=2.1 V, low <=0.8 V, at 25/50/100%",
    "layer": "B.Cu"
  },
  {
    "id": "pwm2",
    "net": "PWM2",
    "what": "PWM2",
    "why": "25 kHz, high >=2.1 V, low <=0.8 V, at 25/50/100%",
    "kind": "waveform",
    "expect": "25 kHz, high >=2.1 V, low <=0.8 V, at 25/50/100%",
    "layer": "B.Cu"
  },
  {
    "id": "tach1",
    "net": "TACH1",
    "what": "TACH1",
    "why": "Compare indicated RPM against an optical tachometer; verify the assumed two tach pulses per revolution for the actual ARCTIC P14 Max.",
    "kind": "waveform",
    "expect": "Compare indicated RPM against an optical tachometer; verify the assumed two tach pulses per revolution for the actual ARCTIC P14 Max.",
    "layer": "B.Cu"
  },
  {
    "id": "tach2",
    "net": "TACH2",
    "what": "TACH2",
    "why": "Compare indicated RPM against an optical tachometer; verify the assumed two tach pulses per revolution for the actual ARCTIC P14 Max.",
    "kind": "waveform",
    "expect": "Compare indicated RPM against an optical tachometer; verify the assumed two tach pulses per revolution for the actual ARCTIC P14 Max.",
    "layer": "B.Cu"
  },
  {
    "id": "onewire",
    "net": "ONEWIRE",
    "what": "ONEWIRE",
    "why": "3.3 V idle, valid presence and CRC; probe disconnect drives fans full",
    "kind": "waveform",
    "expect": "3.3 V idle, valid presence and CRC; probe disconnect drives fans full",
    "layer": "B.Cu"
  },
  {
    "id": "en",
    "net": "EN",
    "what": "EN",
    "why": "RC start delay; low reset drives buffer into high impedance",
    "kind": "waveform",
    "expect": "RC start delay; low reset drives buffer into high impedance",
    "layer": "B.Cu"
  },
  {
    "id": "pwm_disable",
    "net": "PWM_DISABLE",
    "what": "PWM_DISABLE",
    "why": "High at reset, low only after valid PWM initialization",
    "kind": "dc",
    "expect": "High at reset, low only after valid PWM initialization",
    "layer": "B.Cu"
  },
  {
    "id": "gnd",
    "net": "GND",
    "what": "GND",
    "why": "Connect scope ground here before powering",
    "kind": "ground",
    "expect": "Connect scope ground here before powering",
    "layer": "B.Cu"
  },
  {
    "id": "status",
    "net": "LED_A",
    "what": "Status LED",
    "why": "Firmware status indicator",
    "kind": "camera",
    "expect": "Indicates running and fault states"
  }
]