hmc472/hardware/hmc472-controller.kicad_sch

(kicad_sch
  (version 20231120)
  (generator "eeschema")
  (generator_version "8.0")
  (uuid "e63e39d7-6ac0-4ffd-8aa3-1841a4541b55")
  (paper "A4")
  (title_block
    (title "HMC472A Attenuator Controller")
    (date "2026-02-02")
    (rev "1.0")
    (comment 1 "ESP32-S2 Mini to HMC472A Module Wiring")
    (comment 2 "6-bit Digital RF Attenuator 0-31.5dB")
  )

  (lib_symbols
    (symbol "Connector_Generic:Conn_01x08"
      (pin_names (offset 1.016) hide)
      (exclude_from_sim no)
      (in_bom yes)
      (on_board yes)
      (property "Reference" "J"
        (at 0 10.16 0)
        (effects (font (size 1.27 1.27)))
      )
      (property "Value" "Conn_01x08"
        (at 0 -12.7 0)
        (effects (font (size 1.27 1.27)))
      )
      (property "Footprint" ""
        (at 0 0 0)
        (effects (font (size 1.27 1.27)) hide)
      )
      (property "Datasheet" "~"
        (at 0 0 0)
        (effects (font (size 1.27 1.27)) hide)
      )
      (symbol "Conn_01x08_1_1"
        (rectangle (start -1.27 7.62) (end 1.27 -10.16)
          (stroke (width 0.254) (type default))
          (fill (type background))
        )
        (pin passive line (at -5.08 7.62 0) (length 3.81) (name "Pin_1" (effects (font (size 1.27 1.27)))) (number "1" (effects (font (size 1.27 1.27)))))
        (pin passive line (at -5.08 5.08 0) (length 3.81) (name "Pin_2" (effects (font (size 1.27 1.27)))) (number "2" (effects (font (size 1.27 1.27)))))
        (pin passive line (at -5.08 2.54 0) (length 3.81) (name "Pin_3" (effects (font (size 1.27 1.27)))) (number "3" (effects (font (size 1.27 1.27)))))
        (pin passive line (at -5.08 0 0) (length 3.81) (name "Pin_4" (effects (font (size 1.27 1.27)))) (number "4" (effects (font (size 1.27 1.27)))))
        (pin passive line (at -5.08 -2.54 0) (length 3.81) (name "Pin_5" (effects (font (size 1.27 1.27)))) (number "5" (effects (font (size 1.27 1.27)))))
        (pin passive line (at -5.08 -5.08 0) (length 3.81) (name "Pin_6" (effects (font (size 1.27 1.27)))) (number "6" (effects (font (size 1.27 1.27)))))
        (pin passive line (at -5.08 -7.62 0) (length 3.81) (name "Pin_7" (effects (font (size 1.27 1.27)))) (number "7" (effects (font (size 1.27 1.27)))))
        (pin passive line (at -5.08 -10.16 0) (length 3.81) (name "Pin_8" (effects (font (size 1.27 1.27)))) (number "8" (effects (font (size 1.27 1.27)))))
      )
    )
  )

  (text "ESP32-S2 Mini\n(WEMOS/LOLIN)"
    (exclude_from_sim no)
    (at 63.5 50.8 0)
    (effects (font (size 2.54 2.54) bold) (justify left))
    (uuid "text-esp32-title")
  )

  (text "HMC472A Module\n6-bit RF Attenuator"
    (exclude_from_sim no)
    (at 152.4 50.8 0)
    (effects (font (size 2.54 2.54) bold) (justify left))
    (uuid "text-hmc472-title")
  )

  (text "ACTIVE LOW LOGIC:\nLOW = Attenuate\nHIGH = Pass (0 dB)"
    (exclude_from_sim no)
    (at 109.22 130.81 0)
    (effects (font (size 1.524 1.524)) (justify left))
    (uuid "text-logic-note")
  )

  (text "Control Pins (active-low):"
    (exclude_from_sim no)
    (at 152.4 60.96 0)
    (effects (font (size 1.524 1.524)) (justify left))
    (uuid "text-control-header")
  )

  (symbol
    (lib_id "Connector_Generic:Conn_01x08")
    (at 76.2 78.74 0)
    (mirror y)
    (unit 1)
    (exclude_from_sim no)
    (in_bom yes)
    (on_board yes)
    (dnp no)
    (uuid "esp32-s2-mini-header")
    (property "Reference" "J1"
      (at 76.2 60.96 0)
      (effects (font (size 1.27 1.27)))
    )
    (property "Value" "ESP32-S2 Mini"
      (at 76.2 93.98 0)
      (effects (font (size 1.27 1.27)))
    )
    (property "Footprint" ""
      (at 76.2 78.74 0)
      (effects (font (size 1.27 1.27)) hide)
    )
    (property "Datasheet" "~"
      (at 76.2 78.74 0)
      (effects (font (size 1.27 1.27)) hide)
    )
    (pin "1"
      (uuid "esp32-pin1")
    )
    (pin "2"
      (uuid "esp32-pin2")
    )
    (pin "3"
      (uuid "esp32-pin3")
    )
    (pin "4"
      (uuid "esp32-pin4")
    )
    (pin "5"
      (uuid "esp32-pin5")
    )
    (pin "6"
      (uuid "esp32-pin6")
    )
    (pin "7"
      (uuid "esp32-pin7")
    )
    (pin "8"
      (uuid "esp32-pin8")
    )
    (instances
      (project "hmc472-controller"
        (path "/e63e39d7-6ac0-4ffd-8aa3-1841a4541b55"
          (reference "J1")
          (unit 1)
        )
      )
    )
  )

  (symbol
    (lib_id "Connector_Generic:Conn_01x08")
    (at 160.02 78.74 0)
    (unit 1)
    (exclude_from_sim no)
    (in_bom yes)
    (on_board yes)
    (dnp no)
    (uuid "hmc472-module-header")
    (property "Reference" "J2"
      (at 160.02 60.96 0)
      (effects (font (size 1.27 1.27)))
    )
    (property "Value" "HMC472A Module"
      (at 160.02 93.98 0)
      (effects (font (size 1.27 1.27)))
    )
    (property "Footprint" ""
      (at 160.02 78.74 0)
      (effects (font (size 1.27 1.27)) hide)
    )
    (property "Datasheet" "~"
      (at 160.02 78.74 0)
      (effects (font (size 1.27 1.27)) hide)
    )
    (pin "1"
      (uuid "hmc472-pin1")
    )
    (pin "2"
      (uuid "hmc472-pin2")
    )
    (pin "3"
      (uuid "hmc472-pin3")
    )
    (pin "4"
      (uuid "hmc472-pin4")
    )
    (pin "5"
      (uuid "hmc472-pin5")
    )
    (pin "6"
      (uuid "hmc472-pin6")
    )
    (pin "7"
      (uuid "hmc472-pin7")
    )
    (pin "8"
      (uuid "hmc472-pin8")
    )
    (instances
      (project "hmc472-controller"
        (path "/e63e39d7-6ac0-4ffd-8aa3-1841a4541b55"
          (reference "J2")
          (unit 1)
        )
      )
    )
  )

  (text "5V (VBUS)"
    (exclude_from_sim no)
    (at 63.5 71.12 0)
    (effects (font (size 1.27 1.27)) (justify right))
    (uuid "label-esp-5v")
  )

  (text "GPIO1"
    (exclude_from_sim no)
    (at 63.5 73.66 0)
    (effects (font (size 1.27 1.27)) (justify right))
    (uuid "label-esp-gpio1")
  )

  (text "GPIO2"
    (exclude_from_sim no)
    (at 63.5 76.2 0)
    (effects (font (size 1.27 1.27)) (justify right))
    (uuid "label-esp-gpio2")
  )

  (text "GPIO3"
    (exclude_from_sim no)
    (at 63.5 78.74 0)
    (effects (font (size 1.27 1.27)) (justify right))
    (uuid "label-esp-gpio3")
  )

  (text "GPIO4"
    (exclude_from_sim no)
    (at 63.5 81.28 0)
    (effects (font (size 1.27 1.27)) (justify right))
    (uuid "label-esp-gpio4")
  )

  (text "GPIO5"
    (exclude_from_sim no)
    (at 63.5 83.82 0)
    (effects (font (size 1.27 1.27)) (justify right))
    (uuid "label-esp-gpio5")
  )

  (text "GPIO6"
    (exclude_from_sim no)
    (at 63.5 86.36 0)
    (effects (font (size 1.27 1.27)) (justify right))
    (uuid "label-esp-gpio6")
  )

  (text "GND"
    (exclude_from_sim no)
    (at 63.5 88.9 0)
    (effects (font (size 1.27 1.27)) (justify right))
    (uuid "label-esp-gnd")
  )

  (text "+5V"
    (exclude_from_sim no)
    (at 172.72 71.12 0)
    (effects (font (size 1.27 1.27)) (justify left))
    (uuid "label-hmc-5v")
  )

  (text "V6 (0.5dB)"
    (exclude_from_sim no)
    (at 172.72 73.66 0)
    (effects (font (size 1.27 1.27)) (justify left))
    (uuid "label-hmc-v6")
  )

  (text "V5 (1dB)"
    (exclude_from_sim no)
    (at 172.72 76.2 0)
    (effects (font (size 1.27 1.27)) (justify left))
    (uuid "label-hmc-v5")
  )

  (text "V4 (2dB)"
    (exclude_from_sim no)
    (at 172.72 78.74 0)
    (effects (font (size 1.27 1.27)) (justify left))
    (uuid "label-hmc-v4")
  )

  (text "V3 (4dB)"
    (exclude_from_sim no)
    (at 172.72 81.28 0)
    (effects (font (size 1.27 1.27)) (justify left))
    (uuid "label-hmc-v3")
  )

  (text "V2 (8dB)"
    (exclude_from_sim no)
    (at 172.72 83.82 0)
    (effects (font (size 1.27 1.27)) (justify left))
    (uuid "label-hmc-v2")
  )

  (text "V1 (16dB)"
    (exclude_from_sim no)
    (at 172.72 86.36 0)
    (effects (font (size 1.27 1.27)) (justify left))
    (uuid "label-hmc-v1")
  )

  (text "GND"
    (exclude_from_sim no)
    (at 172.72 88.9 0)
    (effects (font (size 1.27 1.27)) (justify left))
    (uuid "label-hmc-gnd")
  )

  (wire
    (pts (xy 81.28 71.12) (xy 154.94 71.12))
    (stroke (width 0) (type default))
    (uuid "wire-5v")
  )

  (wire
    (pts (xy 81.28 73.66) (xy 127 73.66))
    (stroke (width 0) (type default))
    (uuid "wire-gpio1-a")
  )
  (wire
    (pts (xy 127 73.66) (xy 127 86.36))
    (stroke (width 0) (type default))
    (uuid "wire-gpio1-b")
  )
  (wire
    (pts (xy 127 86.36) (xy 154.94 86.36))
    (stroke (width 0) (type default))
    (uuid "wire-gpio1-c")
  )

  (wire
    (pts (xy 81.28 76.2) (xy 124.46 76.2))
    (stroke (width 0) (type default))
    (uuid "wire-gpio2-a")
  )
  (wire
    (pts (xy 124.46 76.2) (xy 124.46 83.82))
    (stroke (width 0) (type default))
    (uuid "wire-gpio2-b")
  )
  (wire
    (pts (xy 124.46 83.82) (xy 154.94 83.82))
    (stroke (width 0) (type default))
    (uuid "wire-gpio2-c")
  )

  (wire
    (pts (xy 81.28 78.74) (xy 121.92 78.74))
    (stroke (width 0) (type default))
    (uuid "wire-gpio3-a")
  )
  (wire
    (pts (xy 121.92 78.74) (xy 121.92 81.28))
    (stroke (width 0) (type default))
    (uuid "wire-gpio3-b")
  )
  (wire
    (pts (xy 121.92 81.28) (xy 154.94 81.28))
    (stroke (width 0) (type default))
    (uuid "wire-gpio3-c")
  )

  (wire
    (pts (xy 81.28 81.28) (xy 119.38 81.28))
    (stroke (width 0) (type default))
    (uuid "wire-gpio4-a")
  )
  (wire
    (pts (xy 119.38 81.28) (xy 119.38 78.74))
    (stroke (width 0) (type default))
    (uuid "wire-gpio4-b")
  )
  (wire
    (pts (xy 119.38 78.74) (xy 154.94 78.74))
    (stroke (width 0) (type default))
    (uuid "wire-gpio4-c")
  )

  (wire
    (pts (xy 81.28 83.82) (xy 116.84 83.82))
    (stroke (width 0) (type default))
    (uuid "wire-gpio5-a")
  )
  (wire
    (pts (xy 116.84 83.82) (xy 116.84 76.2))
    (stroke (width 0) (type default))
    (uuid "wire-gpio5-b")
  )
  (wire
    (pts (xy 116.84 76.2) (xy 154.94 76.2))
    (stroke (width 0) (type default))
    (uuid "wire-gpio5-c")
  )

  (wire
    (pts (xy 81.28 86.36) (xy 114.3 86.36))
    (stroke (width 0) (type default))
    (uuid "wire-gpio6-a")
  )
  (wire
    (pts (xy 114.3 86.36) (xy 114.3 73.66))
    (stroke (width 0) (type default))
    (uuid "wire-gpio6-b")
  )
  (wire
    (pts (xy 114.3 73.66) (xy 154.94 73.66))
    (stroke (width 0) (type default))
    (uuid "wire-gpio6-c")
  )

  (wire
    (pts (xy 81.28 88.9) (xy 154.94 88.9))
    (stroke (width 0) (type default))
    (uuid "wire-gnd")
  )

  (text "Wiring Table:\nGPIO1 → V1 (16dB)\nGPIO2 → V2 (8dB)\nGPIO3 → V3 (4dB)\nGPIO4 → V4 (2dB)\nGPIO5 → V5 (1dB)\nGPIO6 → V6 (0.5dB)\n5V → +5V\nGND → GND"
    (exclude_from_sim no)
    (at 63.5 111.76 0)
    (effects (font (size 1.524 1.524)) (justify left))
    (uuid "text-wiring-table")
  )

  (text "Notes:\n• HMC472A accepts 0-5V TTL/CMOS logic\n• ESP32-S2 GPIO is 3.3V — compatible\n• Total attenuation = sum of active bits\n• Max attenuation: 31.5 dB (all LOW)\n• Min attenuation: 0 dB (all HIGH)"
    (exclude_from_sim no)
    (at 127 111.76 0)
    (effects (font (size 1.524 1.524)) (justify left))
    (uuid "text-notes")
  )
)