Usb Interface; Application Guide - SimCom SIM5300E Hardware Design

4.9 USB INTERFACE

SIM5300E module contains a USB interface,which is used for AT port or updata software. This interface is
compliant with the USB2.0 specification. It supports full-speed (FS, 12Mbps) and high-speed (HS, 480Mbps)
transfers. USB charging and USB-OTG is not supported. The characteristic impedance value should be as
close as possible to 90 Ohms differential. Capacitive loading, trace lengths should be minimized.
Table 15: Electronic characteristic
Pin Name
USB_VBUS
USB_DP
USB_DN

4.9.1 Application Guide

Currently SIM5300E supports the USB suspend and resume mechanism which can help to save power. If no
transaction is on USB bus, SIM5300E will enter suspend mode. When some events such as voice call or
receiving SMS happen, SIM5300E will resume normal mode automatically.
VBUS_USB_IN
Because of high bit rate on USB bus, pay attention to the influence of ESD component's junction capacitance
on USB data lines. Typically, the capacitance should be less than3pF.
SIM5300E_Hardware_Design_V1.02
Pin No. Min
24 4.5
27
USB 2.0 specification, 90 Ohms differential.
28
USB_DP
USB_DM
GND
模 块
Figure 32: USB interface
Typ. Max
5.0 5.25
VBUS
USB_DP
USB_DM
<3pF
GND
连接器
Unit
V
34