The same VB code running a PICkit Serial module works properly i.e. The issue only occurs with the FT230X chip. Toggling RTS should have no effect on the TX line.
SerialPort1.BreakState = False ' Rx high (this has no effect since Rx is already high) SerialPort1.RtsEnable = False ' RTS high (setsRTS line high) SerialPort1.RtsEnable = True ' RTS low ( sets RTS line low AND Rx high) SerialPort1.BreakState = True ' Rx low (sets Rx line low) Issue2: Whenever the FT230X RTS line is toggled using RTSenable, the TX line (if low using BreakState) toggles high.
FTDI FT230X WINDOWS
Issue1: Whenever an FT230X device is connected or powered up and Windows scans for USB devices, the RTS line is toggled
FTDI FT230X SERIES
I haven't used any but I think some are also designed to work with batteries.Hardware: Any FTDI FT230X series USB-serial device (custom FT230X board, UMFT230XB-NC module, In a dual-power role, these muxes will prefer self power, and only switch over to bus power when there is no self power, and they are able to indicate to the MCU which power source is in use right now. The keyword here is that you don't want self powered or bus powered, you want dual power. Issue2: Whenever the FT230X RTS line is toggled using RTSenable, the TX line (if low using BreakState) toggles.
FTDI FT230X PC
TI has an excellent selection of muxes that will automatically switch between two voltages sources, depending on which are available. PC - USB cable - FTDI FT230X USB-UART device TX, RX, RTS signals Issue1: Whenever an FT230X device is connected or powered up and Windows scans for USB devices, the RTS line is toggled. With that out of the way, the next step you will probably need is something like an auto-switching power mux. USB to serial UART interface with optimised pin count for smaller PCB designs, FT230X Datasheet, FT230X circuit, FT230X data sheet : FTDI, alldatasheet, Datasheet, Datasheet search site for Electronic Components and Semiconductors, integrated circuits, diodes, triacs and other semiconductors. If they did enforce the current restrictions, someone's not-quite-good-enough device might work on one host controller but not another, and the consumer is likely to blame the computer/host controller for not working with a bad device, rather than blaming the manufacturer of the bad device. My current design will be mostly self powered but will connect to a PC for data dumps and charging (200mA). But they also mention that it's possible in the documentation.
FTDI recommends not mixing bus and self powered designs. There's always 5V on VBus when the computer is suspended - otherwise, remote wake up would not be possible - and most host controllers don't really enforce the Suspend current restrictions. I'm trying to wire up my first device using an FTDI USB to Serial converter. So, like Passerby said, you really don't have to worry about not going into suspend mode. Now, there are other types of suspend, but they are generally optional. Otherwise, there's almost always some traffic flowing on the bus (e.g. In my experience, the bus only suspends when the PC is suspended. It isn't quite so much "when no data is being transferred", but "when the data lines are idle for an extended period of time". So my question is this, how do I implemented a bus and self powered device that can drain 200mA from the host for charging even when no data is being transferred?įirst you should try to understand USB Suspend. Cheap usb adapter converter, Buy Quality usb converter directly from China adapter cable Suppliers: Ftdi ftx USB, UART ttl 3,3. Below is what I have so far, the idea was that configuring CBUS3 as a keep_awake that would prevent it from going to sleep (as I understand it), this would cause it to always be active though, even when self powered: VBAT is guaranteed to always be 3.3V - 4.2V. Since most of my design operates from 3V, I want the FT230X to interface from this level as well. What I suspect might be a problem is USB suspend mode, which states that if no data is transferred for a set period the USB device should reduce power. It will be powered from a single cell LiPo and has some protection circuitry to prevent over discharging. I'm trying to wire up my first device using an FTDI USB to Serial converter.
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