XMC4500 Development Tool: The Relax Lite Kit

Relax Lite Kit, is an evaluation board from Infineon as development tool to learn XMC4500 microcontroller, an ARM Cortex M4 processor core. The Relax Lite Kit is downgrade version of The Relax Kit with reduce some feature like Ethernet, Micro SD, RTC crystal, Quad-SPI flash memory.



  • XMC4500 Microcontroller (ARM® Cortex™-M4F based)
  • Detachable on-board Debugger
  • Power over USB
  • 2 x User Button and 2 x User LED
  • Reset Button
  • Power Regulator from 5 V to 3.3V
  • 4 x SPI-Master, 3x I2C, 3 x I2S, 3 x UART, 2 x CAN, 17 x ADC (12 bit), 2 x DAC, 31x PMW mapped on 2 Pin Headers 2 x 20
  • USB-OTG (Micro USB Plug)

Relax Kit version that not include in Lite version:

  • Ethernet PHY and RJ45 jack
  • Real Time Clock Crystal
  • 32 Mbit Quad-SPI Flash Memory
  • microSD Card Slot


Relax Kit must be supplied by an external power supply (5V) connected to any of the Micro UBS plugs (X3, X100). There are 2 micro USB plugs, micro USB plug for debugger board and micro USB OTG. Both V-USB use protection diode, that ensure safe operation in case power is provided through both USB plugs at the same time.



Standard USB only can draw 500 mA current, so it need an external power supply if the Relax Kit connected with other circuit that need current higher than 500 mA. Out of the box with the pre-programmed web server application and the on-board debugger in operation the XMC4500 Relax Kit-V1 typically draws about 250 mA. The XMC4500 Relax Lite Kit-V1 without the web server capabilities draws about 200 mA. The external power supply can be connected to to one of the 5 Volt power pins (VDD5) on the pin headers X1 or X2. If the board is powered via a USB plug, it’s not recommended to apply an additional 5 Volt power supply because no protection diode. So if the circuit need current more than 500 mA just use external power supply to pin header X1 or X2.


The pin headers X1 and X2 can be used to extend the evaluation board or to perform measurements on the XMC4500. Figure below shows the available GPIOs/signals at the pin headers. The pinning table is also printed onto the bottom side of the PCB.


The XMC4500 provides a flexible mapping of functions to different pins. Figure below shows an example how the communication peripheral functions UART, I2C, SPI, CAN and I2S can be mapped to XMC4500’s GPIOs.
GPIOs with the same colour code belong to the same group of physical pins and cannot be choosen twice. For instance UART-3 has got a pin overlap with I2C-Master1 and therefore this combination cannot work in parallel.
Please also avoid pheripheral combinations which are using the same USIC channel. For example I2C-Master2 and UART-3 utilizing USIC 0 Channel 0 (U0C0), therefore this combination does not work in parallel.


Detail explanation just refer to The Relax Kit manual.

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