Neoway N715-EA - USB Interface Overview

N715-EA Hardware User Guide
Chapter 5 Application Interfaces
Copyright © Neoway Technology Co., Ltd. All rights reserved.
39
Figure 5-13 Reset process of the N715-EA module
VBAT
RESET_N
Inactive
Active
T>50ms
UART
Active
5.3 Peripheral Interfaces
N715-EA provides various peripheral interfaces.
In all reference designs of this section, the receiving and sending directions included in the pin names
of the peripheral interface of the module are based on the module, whereas peripheral pins are named
based on the components. For example, UART_TXD indicates the pin used by the module to send
data, and MCU_RXD indicates the pin used by the MCU to receive data. These two pins should be
connected.
Please note the signal naming of pins on the components in peripheral selection and design.
5.3.1 USB
Signal
Pin
I/O
Function description
Remarks
USB_VBUS
28
PI
USB insertion detection pin
4.5 V < USB_VBUS < 5.2 V typical
value: 5 V
USB_DM
27
AIO
USB data negative signal
USB 2.0. 90 nominal differential
characteristic impedance.
This pin is used for software
download and data transmission.
USB_DP
26
AIO
USB data positive signal
USB_ID
139
DI
Reserved
-
N715-EA can implement program download, data communications, and debugging through the USB
interface. The USB of N706 only supports slave mode. Figure 5-14 shows the recommended USB
interface circuit.