External power supply is needed when power requirements exceed USB limits.

The F28P65X Experimenter’s Kit ships with a USB cable and is designed to be powered via USB. However, in extreme cases, the board/controlCARD can require more power than the 5V at 500mA (USB 3.0 - 900mA) that a computer USB port can provide. This is especially true when additional circuitry has been added to the docking station. In such cases, TI recommends to use an external 5V power supply (2.5mm inner diameter x 5.5mm outer diameter) and plug into J1. A compatible supply such as:

• CUI SMM6-5-K-P6 + SMI-US-5

5V power supply instability can lead to device resets.

The 5V rail on the TMDSCNCD28P65X controlCARD can be powered from an on-board USB connector or from a baseboard like the TMDSHSECDOCK. A switch device on the controlCARD automatically selects the 5V input power source for the controlCARD without the need for user configuration.

A loss of power or glitching on the baseboard 5V power source can cause the automatic switch to disconnect from both power sources for several milliseconds. This momentary loss of power can cause a brownout condition on the MCU, triggering a device reset. To avoid this condition, make sure that the baseboard power supply remains at 0V or 5V during code execution.

CAN boot mode requires use of on-board BAW oscillator.

The TMDSCNCD28P65X controlCARD supports the use of the CAN boot mode. This boot mode can be selected through switch S3. The CAN boot mode requires the use of an on-board 25MHz BAW oscillator Y2 to clock the F28P65x device. See Section 6 for more information on the S3 Switch. There is no on-board CAN transceiver on the controlCARD; an external transceiver is required.

SCI Boot Option.

By default, in Boot-from-SCI mode, the MCU expects GPIO12 and GPIO13 to be the IO pins responsible for sending the program to the device. But, on this controlCARD GPIO28 and GPIO29 are used for Boot from SCI. These GPIOs are connected to the isolated USB-to-serial interface via the XDS110 emulator.