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Identifying RTL Wi‑Fi module in TP-Link Tapo P105, pinout vs ESP-02S

madlac1971 237 7
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  • #1 21878524
    madlac1971
    Level 6  
    text
    Anyone has info on this RTL board? It's from a Tapo P105 plug. Any info much appreciated.
    Unfortunately, the pinout doesn't seem to match ESP-02S :(.

    Green printed circuit board with electronic components and a central cutout revealing a black ribbon Close-up of a small PCB with an integrated circuit and surface-mount components Small green PCB with printed numbers, circuit traces, and four silver contacts along the bottom edge
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  • #2 21878561
    divadiow
    Level 38  
    not seen that one around I don't think. Do you have a multimeter? could do with tracing to which pins each of the TP pads go to on the RTL8720CF

    Pinout diagram of RTL8720CF-VA1 IC with a crab-like logo and labeled pins around the package
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  • #3 21878573
    madlac1971
    Level 6  
    >>21878561

    Multimeter is not a problem, my eyesight is :(.
    It seems it's being fed with 5 V.
  • #4 21878585
    divadiow
    Level 38  
    5v - seems that is acceptable for RTL8720CF

    Excerpt of a Realtek Ameba‑Z II datasheet table showing power pins and voltage notes
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  • #5 21878639
    madlac1971
    Level 6  
    >>21878561

    It was easier than expected. Should be enough to flash it, thx for the idea. I'll update when I know, unless I release the smoke reserves from the chip LOL.
    TP1 - Vcc, TP8 - Gnd
    TP6 - GPIOA_0, TP9 - 36 (GPIOA_15 UART_Log_RXD), TP7 - 37 (GPIOA_16 UART_Log_TXD)
    TP10 - possibly GPIOA_13 RX
    If I read it correctly, TP6 and 10 go to VCC for flashing.

    Added after 4 [hours] 35 [minutes]:

    >>21878639
    Successfully flashed OpenBeken! Used ltchiptool-v4.14.0 and ltchiptool_ambz2_2026-04-06_14-42-02
    TP1, TP6, TP10 - Vcc , TP8 - Gnd , TP9 - RXD , TP7 - TXD
    Config:
    Code: JSON
    Log in, to see the code


    Purchased off Amazon Canada.
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  • #6 21879831
    madlac1971
    Level 6  
    >>21878639

    Could someone in the know add this to the device database? Let me know if anything else needed to do it. Thx
  • #8 21879842
    madlac1971
    Level 6  
    >>21879839
    Yes. It works - well worked :) - with the Tapo app, not sure about Matter.
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Topic summary

✨ The discussion focuses on identifying the Realtek RTL8720CF Wi-Fi module used in the TP-Link Tapo P105 smart plug and comparing its pinout to the ESP-02S module, which does not match. The module operates at 5 V, which is compatible with the RTL8720CF. Using a multimeter, key test points (TP) were traced: TP1 corresponds to Vcc, TP8 to GND, TP6 to GPIOA_0, TP9 to GPIOA_15 (UART RXD), TP7 to GPIOA_16 (UART TXD), and TP10 possibly to GPIOA_13 RX. Flashing the module with OpenBeken firmware was successful using ltchiptool versions v4.14.0 and ltchiptool_ambz2_2026-04-06_14-42-02. The pin configuration for flashing includes TP1, TP6, and TP10 connected to Vcc, TP8 to GND, TP9 as RXD, and TP7 as TXD. The device is identified as TP-Link Tapo P105 with an RTL87X0C chip. Some pins are assigned functions such as relay control (pin 8), LED indicators (pins 9 and 10), and button input (pin 17).
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