Maxim’s Santa Cruz (MAXREFDES23#) reference design is the world’s smallest IO-Link® light sensor compliant with IEC 61131-9. The entire design fits onto a 6.5mm x 25mm printed circuit board (PCB).

Board Specification

Item Specification
Oscillator Frequency 18.432 MHz
Microcontroller Renesas RL78/G1A (R5F10E8EALA)
DC Power 24 V via M12 Connector
  • Power indicator: Green x1
  • IO-Link indicator: Amber x1
  • Digital output indicator: Red x1
IO-link Connector Male M12 4-pole A-coded
IO-Link PHY Maxim MAX14821EWA+
Sensor Maxim MAX44008EDT+

Project Goal


The purpose of this project is by giving the user a strong basis to start develop production-ready IO-Link® application based on Maxim Integrated IO-Link device transceiver (MAX14821), a Renesas ultra-low-power, 16-bit microcontroller (RL78) and iqStack® IO-Link Device Stack.