convert 5V FTDI adapter board to 3.3V

Using Arduino General Electronics
1

I have been using a voltage divider on the TXD pin of a 5V FTDI adapter board to communicate with ESP-01 boards.

I have two of the 5V FTDI adapter boards, and I am wondering if it is possible to convert them to 3.3V.

I am not looking to just have 3.3V on the VCC pin on the module but for all the data pins including TXD to have logic high of 3.3V.

This http://www.dx.com/p/crius-ftdi-basic-breakout-5v-usb-to-ttl-6-pin-module-for-mwc-multiwii-lite-se-228307 is the module I have.

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2

What about this statement from the webpage link

"One of the nice features of this board is a jumper on the back of the board that allows the board to be configured to either 3.3V or 5V (both power output and IO level); This board ship default to 5V, but you can cut the default trace and add a solder jumper if you need to switch to 3.3V"

Could it be that easy? (not trying to be sarcastic but weary of anything that easy)

3

There is no jumper.
The photos show that.

4

See second photo.

FTDI 5V-3_3V.JPG

5

adwsystems:
See second photo.

Those are pads.

There are boards with actual jumpers on them.

6

Yes there are, but this isn't one of them. In this case there's a little copper bridge between the middle and 5V pad. Cut that, then solder between middle and 3.3V pad.

7

adwsystems:
There's a little copper bridge between the middle and 5V pad. Cut that, then solder between middle and 3.3V pad.

Thanks. I have seen videos showing that.

I thought I was missing something when they mention jumper.

Geekcreit® ft232rl ftdi usb to ttl serial converter adapter module geekcreit for arduino - products that work with official arduino boards Sale - Banggood.com sold out-arrival notice has a honest to goodness jumper.

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8

ieee488:
I thought I was missing something when they mention jumper.

Ditto on that, especially when they don't bother to show you "photo #2".

9

Also, the ESP8266 is 5V-tolerant on it's I/O-pins, so it wouldn't hurt to use the 5V FTDI, as long as VCC for the ESP8266 is 3.3V

// Per.

10

IIRC, the jumper just connects either 5V or 3V3OUT to the VCCIO pin. This just changes the supply voltage for the output drivers, allowing for different voltage levels at its outputs.

See page 7 of the datasheet:

FT232R datasheet: p.7, §3.2: SSOP Package Pin Out Description:
+1.8V to +5.25V supply to the UART Interface and CBUS group pins (1...3, 5, 6, 9...14, 22, 23). In USB bus powered designs connect this pin to 3V3OUT pin to drive out at +3.3V levels, or connect to VCC to drive out at 5V CMOS level. This pin can also be supplied with an external +1.8V to +2.8V supply in order to drive outputs at lower levels. It should be noted that in this case this supply should originate from the same source as the supply to VCC. This means that in bus powered designs a regulator which is supplied by the +5V on the USB bus should be used.

Pieter