Some NuMicro? family series that support USB function are provided with the internal LDO which can convert 5V input voltage of VBUS into 3.3V output voltage and supply the 3.3V to a USB transceiver. When the USB function is used, the LDO output pin VDD33 needs to connect to the LDO output voltage having a stable capacitor. Also, the capacitor needs to be close to the VDD33 pin.
According to different NuMicro? Family series, the value of an external capacitor for VDD33 may be different. Please refer to the following table:
In consideration of chip operational stability, it is not recommended that LDO output be used to drive other external chips.
Is the NuMicro? family chip provided with an internal LDO (Low Dropout Regulator) to supply 3.3V to a USB transceiver?
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