SPRUIZ4B May 2021 – June 2022
5-V power suppy instabilty may lead to device resets
The 5-V rail on the TMDSCNCD280039C 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 5-V input power source for the controlCARD without the need for user configuration.
A loss of power or glitching on the baseboard 5-V power source can cause the automatic switch to disconnect from both power sources for several milliseconds. This momentary loss of power may cause a brownout condition on the MCU, triggering a device reset. To avoid this condition, ensure that the baseboard power supply remains at 0 V or 5 V during code execution.