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).
- 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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