SIM5300E_Hardware_Design_V1.02
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
USB 2.0 specification, 90 Ohms differential.
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.
模 块
连接器
USB_DM
GND
GND
VBUS_USB_IN
VBUS
USB_DP
USB_DM
USB_DP
<3pF
Figure 32: USB interface
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.
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