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website/content/lab-notes/iPod Shuffle 3rd Gen attempts.md
Mira 5d3e1a74bc oh boy
2026-01-04 14:04:14 -05:00

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title date modified draft
iPod Shuffle 3rd Gen attempts 2025-12-11 2025-12-11 true

Parts:

  • Charging Circuit
    • Inputs:
      • Seems to take 5V
    • Outputs
      • VBAT to Battery? (is that what the connection to BAT0 does??)
      • VCC (3V) to system
  • Battery
    • Input: VBAT??
    • Output: VBAT??
  • MicroSD card Reader
    • Inputs:
      • VBUS? VSYS?
      • CLK
      • DI
      • CS
      • CD???
      • VCC
    • Outputs:
      • DO
  • TRRS Jack
    • Outputs:
      • Sleeve (is this analog or digital, if we're only checking for button press)
      • Right (Analog)
      • Left (Analog)
      • RSw/LSw (floats when plug is inserted, why are there two? Mono?)
  • BT Chip + Antenna (Built into SoC, assuming ESP32-S3)
    • Inputs:
    • Outputs:
  • Switch
    • Output state
  • LED
    • Input State
  • SoC
    • Assuming ESP32-S3
      • Outputs:
        • CLK
        • CS
        • TRRS Left (Analog)
        • TRRS Right (Analog)
        • SD DI
        • LED
        • USB D+/D-
      • Inputs:
        • TRRS Sleeve (Analog?)
        • SD DO
        • VCC
        • Switch
        • USB D+/D-
        • LSw, RSw (?)
  • USB-C Port
    • Outputs VBUS(5V?), USB D+/-