Mod a USB to TTL Serial Adapter (CP2102) to Program ESP8266

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This USB to TTL Serial board based on the CP2102 chip, it have no enough current (400mA+) to driven ESP8266. So I will fix the issue.

CP2102 Datasheet: https://www.sparkfun.com/datasheets/IC/cp2102.pdf

UPDATE: I made a new CP2102 USB to TTL converter depend on the board. It's now on tindie.

Step 1: Materials

  • 1 x CP2102 USB adapter, it's easy be found at eBay by keyword cp2102
  • 1 x AMS1117-3.3
  • A knife
  • A soldering iron

Step 2: Cutting Off the Original 3.3V Output

The 3.3V from CP2102 has only 200mA output. It's not enough for esp8266. I cutting off the 3.3V output with an knife.

Step 3: Soldering LDO AMS1117-3.3

Use the pin 5V as input of AMS1117, connect the output to 3.3V

Now the USB adapter can driven esp8266 directly.

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    22 Discussions

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    gcarom

    6 weeks ago

    Nice project ! I am wondering, Is it necesary to cut the 3v3 rail ?, or is it possible to use the 3v3 output of the AMS1117 to the 3v3 of the ESP, and leave the 3v3 of the CP2102 unconnected ? maybe using a breadboard, I don't want to cut that rail.
    Thanks in advance

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    kubik256adam_99

    Reply 2 years ago

    I'm using old Profilic PL2303 USB2TTL adapter with dual 3.3V and 5V outputs.
    On 3.3V pin flashing ESP without external power is ok ;) Tested with ESP-01, ESP-12E, ESP-14 and LUA MCU Dev Board V3.

    If you have only 5V output, so this mod can work. BR

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    DumindaP1kubik256

    Reply 1 year ago

    Does old prolific driver work with Windows 10? Bought one and no any text on the chip, couldn't make it work yet :(

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    kubik256DumindaP1

    Reply 1 year ago

    It is working, but with only one old Profilic driver ... drivers from Windows Update or automaticaly installed drivers doesn't work. (the exclamation mark in HW manager)


    I've saved it for later use, here is link from my dropbox:
    https://www.dropbox.com/s/5ddxoi44ads0435/Profilic...

    Please don't forget to check it with antivirus SW before running it!
    I've installed this many months ago, BR ;)

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    DumindaP1kubik256

    Reply 1 year ago

    Thanks kubik256 your driver works fine.

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    adam_99kubik256

    Reply 2 years ago

    Interesting...
    I didn't know I can draw enough current from the chip on 3.3v
    I'll try.
    Thanks!

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    DerMega

    3 years ago on Introduction

    Hmmm aren´t the TR/RX wires from the CP2102 5V too?

    So they are able to destroy the ESP aren´t they?

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    kapilrathi22

    4 years ago on Introduction

    I am using ESP8266 with CP2102. For ESP8266 supply I am using LD33v connected to VCC and CH_PD. as soon as serial monitor is open it shows continuous garbage value which is never ending. How to solve this issue?

    2 replies
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    kapilrathi22yanc

    Reply 4 years ago on Introduction

    Hi yanc, For ESP supply I used LD33v output which is 3.3 v and can handle 1A current.

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    yanc

    4 years ago

    You can found the driver here https://www.silabs.com/products/mcu/Pages/USBtoUARTBridgeVCPDrivers.aspx