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FTDI USB TTL X6

Page history last edited by MrTundraMan 10 years, 5 months ago

FTDI USB to TTL Board Revision X6

 

 

 

The FTDI USB to TTL Board Revision X6 is a substantial departure from previous versions of the FTDI USB-to-TTL boards.  Some of the differences include:

 

  • Different FTDI chip (FT230X instead of the FT232RL).
    • The FT230X is less expensive ($2.04 at Mouser for a single piece) than the FT232RL ($4.50 at Mouser for a single piece).
  • Smaller form factor.
    • Still 1" wide but narrower.
    • 1" wide due to 4-40 hardware and USB connector.
    • Less expensive PWB (Under $1.10 a board from OSHPark).
  • Moved the connectors (USB and otherwise) to the back side of the board. 
    • So the back is like the front except that the chip is on the other side of the board from the connector.
  • Moved the USB connector closer to the edge of the card.
    • This will help the connector stick through the side of the enclosure it is in more easily.
  • Set VCCIO to 3.3V so that the board can work with 3.3V or 5V interface cards.
  • Board revision X5 had wrong pinout for the FTDI chip (QFN pinout instead of SO-16).
    • Rev X6 fixes that.
  • USB shell ground is no longer connected to the board ground.
    • Assuming that the USB cable is shielded (they are).
    • Assuming that the USB shield connects to the metal shell of the connector on both ends (they do). 
    • Assuming that the USB cable doesn't connect the wire ground pin to the shield (they don't).
    • Don't know if this matters in plastic cases, but for metal cases it might matter since it will keep the grounds of the chassis isolated.
  • Handshake signals different but still work with Arduino IDE.
    • Uses RTS/CTS instead of DTR/CTS.
  • Pin 1's are marked with a white dot on the silkscreen.

 

Other important features include:

 

  • 4-40 mounting holes on both sides of USB connector for sturdy mount.
  • 3.3V/5V Header selects the voltage that will be provided from the FTDI USB to TTL Board.
    • Note that the 3.3V has serious current limitations since the FT230X provides the voltage regulation.
    • If the jumper is left off the header the board can provide its own power.
  • 6-pin connector matches FTDI pinout for TTL connector.
  • Transmit and Receive LED connector with current limiting resistor on-board.
  • 5V tolerant inputs.

 

Connector Pin-outs

 

P1 - FTDI Connector (6-pin BERGSTIK)

 

Pin
Description

Direction

(Card Relative)

1
GND
Common
2
CTS
Input
3
VCC
Output
4 RX
Output
5
RX
Input
6
RTS
Output

 

H1 - Output Power Select Jumper

 

Jumper
Description
1-2
Provide +3.3V as VCC (current limited)
2-3
Provide +5V as VCC (limited to 1/2A USB current)
None
Do not provide any power on VCC

 

 

H2 - LED Header

 

Pin
Description
1
RxLED+ Pull-up
2
RxLED-
3
TxLED+ Pull-up
4
TxLed-

 

 

 

Board Layout

 

      

 

 

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