User's Manual

N
720 Hardware User Guide
Copyright © Neoway Technology Co., Ltd 21
2.4 USB Interface
Name Pin I/O Function Remarks
VBUS 40 P USB voltage test 3.3V~5.2V, typically 5V
USB_DM 41 IO
USB data negative
signal
USB2.0, used for firmware
download and data transmission
USB_DP 42 IO
USB data positive
signal
You can download programs for N720 and establish data communication for commissioning
through the USB interface. If the module is used only as USB Device, the recommended USB
circuit is shown in Figure 2-14.
Figure 2-14 USB circuit
Micro USB
VBUS
22PF
ESD9X5VU ESD9X5VU
PESD5V0S1BL
DNI-18PF
0Ω
0Ω
USB_DM
USB_DP
1UF
Parallel a 1F and 22pF filter capacitors to the VBUS pin as close to the pin as possible. TVS
components are required for the VBUS power line. The junction capacitance of the TVS
protection diodes for USB_DP and USB_DM should be lower than 12pF as possible. USB data