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NUC120/122/123/220 USB Series / Technical Reference Manual
https://www.nuvoton.com.cn/products/microcontrollers/arm-cortex-m0-mcus/nuc120-122-123-220-usb-series/?tab=2&group=Document&rt...
/resource-files/TRM_NUC123_Series_EN_Rev2.05.pdf NUC123 Series-Arm Cortex-M0 core, 72 MHz, 36/68 KB Flash, 20 KB SRAM, 2.5V ~ 5.5V, USB 2.0 full speed device DA05-NUC123
NUC120/122/123/220 USB Series / Technical Reference Manual
https://www.nuvoton.com.cn/products/microcontrollers/arm-cortex-m0-mcus/nuc120-122-123-220-usb-series/?tab=2&group=Document&rt...
/resource-files/TRM_NUC2201_Series_EN_Rev1.01.pdf NUC2201 Series Technical Reference Manual (TRM) DA05-NUC2201
FAQ / How much capacitor can VBUS use when using the USB function?
https://www.nuvoton.com.cn/support/technical-support/faq/d79b4cf1-04f1-11ea-b113-05daf7eedf03/
How much capacitor can VBUS use when using the USB function? 1493184411318 The VBUS capacitors need to comply with the USB-IF specification inrush current. For USB 2.0, the USB-IF defined that inrush current could not exceed 50 uC. Therefore, if the VBUS normal voltage is 5.0V (Q = CV), the VBUS capacitor shall not exceed 10 uF. Users need to design their own circuit, and adjust the VBUS capacitor. With the USB analysis tool USBET20 provided by USB-IF, user can see if the VBUS capacitor conforms to the USB-IF specification.
FAQ / How to increase the number of devices supported when connecting to an external USB hub?
https://www.nuvoton.com.cn/support/technical-support/faq/d82a94d7-04f1-11ea-b113-05daf7eedf03/
Endpoint, USB, Hub How to increase the number of devices supported when connecting to an external USB hub? 1516007096437 Please increase the values of the DEV_MAX_NUM, ED_MAX_NUM and MAX_HUB_DEVICE in usbh_config.h, as shown below.
FAQ / Can USB clock source be used for the internal high-speed RC oscillator (HIRC)?
https://www.nuvoton.com.cn/support/technical-support/faq/d437afa5-04f1-11ea-b113-05daf7eedf03/
Can USB clock source be used for the internal high-speed RC oscillator (HIRC)? 1423564121487 The NuMicro® Nano120 /130 series can use an external low-speed oscillator (LXT) to ensure the accuracy HIRC of to 0.25%, which is compliant with the USB specification. The other NuMicro® series need to use an external oscillator as the USB clock source.
FAQ / How to design hardware circuit for USB interface?
https://www.nuvoton.com.cn/support/technical-support/faq/d46fd6c6-04f1-11ea-b113-05daf7eedf03/
How to design hardware circuit for USB interface? 1423411200000 The NuMicro™ Cortex-M0 family supports powerful full-speed USB devices embedded 1.5kΩ pull-up resistor and LDO 3.3V output. Please refer to the picture below and note that the impedance of D- and D+ traces should match 45Ω. Also, 1.5kΩ pull-up resistor and LDO 3.3V output can be controlled by DPPU bit and PWRDN bit of USB_ATTR respectively. Note: VDD33 is only used by the internal circuit of NuMicro™ Cortex-M0 Series and must be connected with 1uF capacitance for voltage stability.
FAQ / Can Nuvoton provide the VID (0x0416) for customers?
https://www.nuvoton.com.cn/support/technical-support/faq/d48310b2-04f1-11ea-b113-05daf7eedf03/
VID, Vendor ID Can Nuvoton provide the VID (0x0416) for customers? 1423645267895 The VID (0x0416) is licensed from USB-IF by Winbond. Nuvoton, a spin-out of Winbond Electronics’ Logic business group does not suggest that customers use the VID (0x0416) to design USB applications. Please refer to the following USB-IF website to license a Vendor ID for USB production. http://www.usb.org/developers/vendor/
FAQ / Is I2S able to handle 24-bit data?
https://www.nuvoton.com.cn/support/technical-support/faq/d4eb218b-04f1-11ea-b113-05daf7eedf03/
Is I2S able to handle 24-bit data? 1427851980000 Yes, the I2S controller consists of I2S protocol interface with external Audio CODEC. Two 8-word deep FIFO for reading and writing path respectively are capable of handling 8, 16, 24, 32 bit word sizes.
FAQ / Is data received from right channel or left channel in I2S mono mode?
https://www.nuvoton.com.cn/support/technical-support/faq/d4efb56e-04f1-11ea-b113-05daf7eedf03/
Is data received from right channel or left channel in I2S mono mode? 1427852580000 The data is received from right channel in I2S mono mode.
FAQ / How to connect the VBUS and VDD33 pin if the USB device application doesn’t need to detect the USB plug-in and plug-out and only the 3.3V power is supplied in the system?
https://www.nuvoton.com.cn/support/technical-support/faq/d54db327-04f1-11ea-b113-05daf7eedf03/
How to connect the VBUS and VDD33 pin if the USB device application doesn’t need to detect the USB plug-in and plug-out and only the 3.3V power is supplied in the system? 1432717920000 Both the USB VBUS and VDD33 pin are connected to the 3.3V power.
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