Difference between revisions of "OPTOUSB"
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# TXLED - Transmit LED | # TXLED - Transmit LED | ||
# PUP1 - LED Pullup to USB Power | # PUP1 - LED Pullup to USB Power | ||
| − | RXLED - Receive LED | + | # RXLED - Receive LED |
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| − | + | === J3 - FTDI Connector === | |
| − | |||
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| − | Card Test | + | * Signals are references to external system |
| − | UUT | + | |
| − | 5V Power Supply | + | # GND |
| − | Loopback/FTDI Cable | + | # RTS (In to card) |
| − | Pin 1 = Ground (5V Supply) | + | # VCC (3.3V or 5V) - Power must be supplied to this pin |
| − | Pin 3 = Vcc (5V Supply) | + | # Receive (Out from card) |
| − | Pin 2 - Pin 6 RTS/CTS Loopback | + | # Transmit (In to card) |
| − | Pin 4 - Pin 5 Tx/Rx Loopback | + | # CTS (Out from card) |
| − | Run puTTY | + | |
| − | Run Device Manager to determine COM port | + | == Drivers == |
| − | Set baud rate to TBD (115,200?) | + | |
| − | Loopback test | + | * [ FTDI Drivers] |
| − | Rework - Rev X1 PWBs | + | |
| − | OPTOUSB_Rev_X1_Rework | + | == Layout == |
| + | |||
| + | [[File:OPTOUSB-CAD-X1.PNG]] | ||
| + | |||
| + | == Transfer Rate Characterization == | ||
| + | |||
| + | * LTSpice Simulation results | ||
| + | * 8.6uS per bit = 115,200 baud | ||
| + | |||
| + | [[File:OPTO-USB LTSpice Simulation.png]] | ||
| + | |||
| + | == Card Test == | ||
| + | |||
| + | * UUT | ||
| + | * 5V Power Supply | ||
| + | * Loopback/FTDI Cable | ||
| + | ** Pin 1 = Ground (5V Supply) | ||
| + | ** Pin 3 = Vcc (5V Supply) | ||
| + | ** Pin 2 - Pin 6 RTS/CTS Loopback | ||
| + | ** Pin 4 - Pin 5 Tx/Rx Loopback | ||
| + | * Run puTTY | ||
| + | * Run Device Manager to determine COM port | ||
| + | * Set baud rate to TBD (115,200?) | ||
| + | * Loopback test | ||
| + | |||
| + | == Rework - Rev X1 PWBs == | ||
| + | |||
| + | [[OPTOUSB_Rev_X1_Rework]] | ||
== Assembly Sheet == | == Assembly Sheet == | ||
* [[OPTOUSB Assembly Sheet]] | * [[OPTOUSB Assembly Sheet]] | ||
Revision as of 12:44, 10 January 2020
Contents
Features
- USB to TTL level Serial (FTDI) Interface
- Genuine FTDI FT230XS part
- Standard FTDI drivers
- Buffered lines on the TTL level side
- Schmidt Trigger
- Voltage level hysteresis
- Improved slew rate
- Schmidt Trigger
- OptoIsolated Connections
- Transmit, Receive, RTS, CTS
- Configured for High Speed Serial
- The Host USB connection is independent of the state of the FTDI side of the interface
- Host side can communicate with the USB host whether or not the target is even powered up
- Target power on/off doesn't cause a USB disconnect - handy for debug
- Fast operation
- 3.3V or 5V FTDI voltage (order option)
- Transmit/Receive LED Connectors
- On-board LED resistors
- 49x49mm card
- (4) #4 Mounting Holes
Block Diagram
Separate Power Domains
- The OPTOUSB card has two distinct power domains.
- One of the domains is the USB side where the power comes from the USB connector/cable.
- The other power domain is on the TTL side where the power comes from the FTDI connector.
- This is unlike "normal" FTDI interfaces where the USB connection can power the FTDI side.
- This is the purpose of the optical isolation - to isolate the ground of the USB side from the target (FTDI) side.
Connectors
J1 - Mini USB Connector
- Standard USB Mini connector
J2 - Transmit/Receive LED connections
- PUP0 - LED Pullup to USB Power
- TXLED - Transmit LED
- PUP1 - LED Pullup to USB Power
- RXLED - Receive LED
J3 - FTDI Connector
- Signals are references to external system
- GND
- RTS (In to card)
- VCC (3.3V or 5V) - Power must be supplied to this pin
- Receive (Out from card)
- Transmit (In to card)
- CTS (Out from card)
Drivers
- [ FTDI Drivers]
Layout
Transfer Rate Characterization
- LTSpice Simulation results
- 8.6uS per bit = 115,200 baud
Card Test
- UUT
- 5V Power Supply
- Loopback/FTDI Cable
- Pin 1 = Ground (5V Supply)
- Pin 3 = Vcc (5V Supply)
- Pin 2 - Pin 6 RTS/CTS Loopback
- Pin 4 - Pin 5 Tx/Rx Loopback
- Run puTTY
- Run Device Manager to determine COM port
- Set baud rate to TBD (115,200?)
- Loopback test
