I2CDIFF01 - Differential I²C Transceiver
Allows long-range I²C communication in harsh environments. In addition to I²C data transfer, the module supports bidirectional interrupt signaling over the same cable.
Features
- Converts standard I²C signals to differential I²C for robust transmission
- Supports interrupt signal transmission
- Uses PCA9616 buffer for differential I²C communication
- Enables power transmission over RJ45 cable
- Configurable voltage levels using onboard jumpers
- Power regulation with onboard voltage regulators
- RJ45 (Ethernet) cable for differential connection (UTP cable compatible)
Technical Specifications
| Parameter |
Value |
| Supply Voltage |
Up to 15 V |
| Communication |
I²C, Differential I²C |
| Main IC |
PCA9616 |
| Dimensions |
40.1 × 50.3 × 16 mm |
Power and Voltage Configuration
- VDDA: Voltage for single-ended I²C side (selectable 3.3 V or 5 V by jumper; replace regulator for other voltages)
- VDDB: Voltage for differential I²C side (recommended 5 V)
- Power is supplied via the RJ45 cable; only one module in the chain should provide power
- Optional jumper on EXT-VDD allows routing of input voltage to internal regulator if below 15 V
Connector Use
- RJ45 connector used for differential I²C transmission and power
- Do not connect the RJ45 cable to standard Ethernet equipment
Jumpers and Configuration
- Jumpers available to select voltage sources (VDD1 or VDD2) for VDDA and VDDB
- Recommended not to use the SEL jumper when VDDA > 2.2 V
- Voltage levels indicated on PCB; use permanent marker to label used levels
Typical Use Cases
- Extending I²C bus over longer distances
- Connecting devices across electrically noisy environments
- Applications requiring shared interrupt signaling across modules
Notes
- Ensure proper termination of differential pairs per PCA9616 datasheet
- Verify jumper settings and supply voltages before powering the module
- Do not mix power sources across RJ45-connected modules
