The Control Hub (REV-31-1595) is a 3.3V logic level device, but many of the sensors that teams have previously purchased through companies such as Modern Robotics are 5V logic level devices. Many of these previously purchased sensors can be used with the new system by using a logic level converter. REV Robotics offers a Logic Level Converter (REV-31-1389) and an optional Sensor Adapter Cable (REV-31-1384) so teams can more easily use their legacy sensors with the REV Control System.
The REV Robotics Logic Level Converter is a PCB which generates a 5V output from the 3.3V input and uses a MOSFET on each signal line to create a bidirectional communication appropriate for a variety of digital signals include I2C communication (Figure 5). For more information on how bidirectional level shifting communication is accomplished, please reference the NXP Application Note AN10441.