Specifications

Smart Machine Smart Decision
SIM5800_Hardware Design_V1.01 27 2018-10-08
4.5 USB interface
The SIM5800 can be used to debug and download software via USB.
Table 6: USB interface
The connection circuit diagram is recommended as follows:
Module
Connector
USB_DM
GND
GND
VBUS
VBUS
1uF
<1pF
USB_DP
USB_DM
USB_DP
USB_ID
Figure 16: USB reference circuit
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:
VBUS
USB_DM
USB_DP
GND
VBAT
PMIC
PC
VCHG
USB_DN
USB_DP
GND
Module
Charging
cricuit
Figure 17: USB Download diagram
Note:
Pin Name
Pin NO
Description
VBUS
141，142
USB 5V Power supply input and USB insert detection
USB_DM
13
USB -
USB_DP
14
USB +
USB_ ID
16
USB device detection signal