Usb Interface - Sunsea AIoT SIMCom SIM5800 Hardware Design

4.5

USB interface

The SIM5800 can be used to debug and download software via USB.
Table 6: USB interface
Pin Name Pin NO
VBUS
141，142
USB_DM 13
USB_DP 14
USB_ ID 16
The connection circuit diagram is recommended as follows:
Customers can download and upgrade software via USB. The module provides a convenient way to download.
Customers do not need to connect VBAT, only insert USB cable to complete the download. In the download stage,
VBAT of the module can be provided by VCHG, but the current limit of this channel is very small, only enough
for the module to download, and the module cannot be started up through VCHG power supply.
The customer first run the download tool, and then inserts the USB. After the module detects the USB insertion, it
will automatically boot into the download mode. The connection diagram is as follows:
PMIC
Note:
SIM5800_Hardware Design_V1.01
Smart Machine Smart Decision
Description
USB 5V Power supply input and USB insert detection
USB -
USB +
USB device detection signal
VBUS
USB_DP
USB_DM
1uF
USB_ID
GND
Module
Figure 16: USB reference circuit
VBAT
Charging
cricuit
VBUS
USB_DM
USB_DP
GND
Module
Figure 17: USB Download diagram
VBUS
USB_DP
USB_DM
<1pF
GND
Connector
VCHG
USB_DN
USB_DP
GND
PC
27 2018-10-08