FAQ

FAQ

Is the NuMicro® family chip provided with an internal LDO (Low Dropout Regulator) to supply 3.3V to a USB transceiver?  日付:2015-09-09

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:

NuMicro® Family Series

Minimum Value of

an External Capacitor

NUC120 Series

1 uF

NUC140 Series

1 uF

NUC122 Series

1 uF

NUC123 Series

1 uF

NUC220 Series

1 uF

NUC240 Series

1 uF

Nano120/130 Series

1 uF

NUC442/472 Series

10 uF

M452/453 Series

1 uF

NUC505 Series

Do not have LDO for USB.

In consideration of chip operational stability, it is not recommended that LDO output be used to drive other external chips.

製品: マイクロコントローラ ,Arm Cortex-M0 MCU ,ナノ 120 USB シリーズ ,ナノ 130 アドバンストシリーズ ,NUC120/122/123/220 USB シリーズ ,NUC140/240 コネクティビティシリーズ ,Arm Cortex-M4 MCU ,M452 USB シリーズ ,M453 CAN シリーズ ,NUC442/472 シリーズ ,NUC505 シリーズ
アプリケーション:
機能: Peripherals,Connectivity,USB,Power Detection,LDO
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