This reference design implements an IO-Link master using the TIOL112 PHY and surrounding components needed to build a complete IO-Link master design. Therefore, on the physical side in addition to the TIOL112 device, only a power supply for the ports has to be added.

The necessary current sink is already integrated into TIOL112 and automatically activated when using a current limit set resistor below 5 kΩ. The device is in this mode able to directly drive a wake-up pulse. In this mode, the current limit is set to about 700 mA, so enough current to drive a wakeup, but still limited to a safe level, so nothing can be damaged.

On the other side it is necessary to have a hardware as well as frame handler that support all three communication speeds. The TIOL112 device used as PHY here can handle all speeds (COM1, COM2, COM3) the eight port frame handler is implemented in the programmable real-time unit (PRU) of the AM243x.

To realize an eight-port IO-Link capable master gateway, eight TIOL112 devices are necessary. One TPS2724160 supports four IO-Link ports. This results in only eight TIOL112 devices (IO-Link PHY), two TPS2724160 devices (high-side switch), and one TCA6424 device (LED driver).