usw-lite-16-poe

Unifi Switch Lite 16 PoE

A fanless 16-port switch with 8 PoE+ ports and built-in power supply. Rated PoE power budget is 45W.

Components

  • SoC: RTL8382M
  • RAM: 128MiB DDR3 (Winbond W631GG8MB-15)
  • Flash: 16MiB SPI NOR (Macronix MX25L12835FMI-10G)
  • Ethernet ports:
    • 1-8: SoC's internal RTL8218B
    • 9-16: External RTL8218B
  • PoE: Broadcom platform
    • Nuvoton M0516LDN management MCU
    • 1× Broadcom BCM59121 PSE controller
  • Extra I/O
    • 2× NXP PCA9555A: 16-bit I2C GPIO expander
    • 5× 74VHC595: 8-bit latching shift register with 3-state output enable (U112, U114, U117, U118, U119)
  • Power supply: 100V-240V AC with C13 plug, internal PSU provides power for PoE and switch functions. Low voltage power is managed by an internal TPS23754 802.3at PD controller.

Board configuration

  • SoC
    • gpio 0: reset button
    • gpio 1: /INT of PCA9555 @ 25, falling edge/active low
    • gpio 2: I2C-0 SCL (bit banged)
    • gpio 3: I2C-0 SDA (bit banged)
    • gpio 12: I2C-1 SCL (bit banged). Defined in OEM, but not used.
    • gpio 13: I2C-1 SDA (bit banged). Defined in OEM, but not used.
  • I2C-0: 5 devices reported by i2cdetect
    • PoE MCU @ 0x20 (U49)
    • PCA9555A @ 0x22 (U11)
      • /INT: cascaded into U469:P1_7 (gpio 15 on PCA9555A @ 25)
      • gpio 0: port 2 amber PoE status LED
      • gpio 1: port 1 amber PoE status LED
      • gpio 2: port 4 amber PoE status LED
      • gpio 3: port 3 amber PoE status LED
      • gpio 4: port 6 amber PoE status LED
      • gpio 5: port 5 amber PoE status LED
      • gpio 6: port 8 amber PoE status LED
      • gpio 7: port 7 amber PoE status LED
    • PCA9555A @ 0x25 (U469)
      • /INT: cascaded into SoC gpio 1
      • gpio 8: white LED, active high
      • gpio 9: blue LED, active high
      • gpio 10: PoE output enable, active high
      • gpio 15: /INT of PCA9555A @ 22, active low (interrupt on falling edge)
    • NCT375 (LM75A compatible) @ 0x48 (U152): SoC temperature
    • NCT375 (LM75A compatible) @ 0x49 (U153): phy temperature
  • I2C-1: no devices reported by i2cdetect
  • usw-lite-16-poe.txt
  • Last modified: 2023/01/30 15:28
  • by svanheule