This USB to TTL Serial Cable works at 3.3V and is a simple way to connect TTL interfaces to a USB port such as on a Raspberry Pi. The TTL I/O pins are labelled and separated so they can accommodate different scenarios.
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Supplier Link: [SparkFun MPN:12977]
This is a USB to TTL Serial Cable which allows for a simple way to connect TTL interface devices to USB. The I/O pins of this cable are configured to operate at 3.3V specifically with a Raspberry Pi with each serial pin broken apart. Thanks to its separated pins, this cable is a perfect candidate for powering, connecting, and accessing the login and debug console on the Raspberry Pi.
The FTDI cable is designed around an FT232, which is housed in a USB-A connector. The other side of the cable is terminated with a separated 4-pin connector with the following pinout: RX (Yellow), TX (Orange), VCC (Red), and GND (Black). A link to the FTDI drivers can be found in the Documents section below.
Note: Please be aware that while the I/O pins in this cable operate at 3.3V, the VCC pin is 5V. The VCC pin is NOT 3.3V like the I/O pins.