MeiG
Product
Manual
of
SLM750
Module
SLM750
Module
Hardware
Design
Page 43, total 84 pages
3.10.1 USB pin description
SLM750 module provides a USB2.0 High-Speed interface.
Table 10: USB interface description
Name
Pin name
I/O
Description
Note
USB_DM
70
IO
USB differential data
signal
-
Require 90
Ω
differential
impedance
USB_DP
69
IO
USB differential data
Require 90
Ω
differential
impedance
GND 72
-
Ground
USB_VBUS
71 PI
USB power supply, used
for USB detection
Typical value
5.0V
3.10.2 USB reference circuit
USB interface application reference circuit of SLM750 is shown in the following figure.
USB_DM
ESD Array
Test Points
R2
0R
R1
0R
R4
R3
NM 0R
NM 0R
USB_DP
GND
USB_DM
USB_DP
GND
Module
MCU
R5
0R
USB_VBUS
USB_VBUS
Figure 16 USB reference circuit
In order to meet the signal integrity requirements of the USB data line, the resistors R1/ R2/
R3/ R4 must be placed close to the module, and the resistors need to be placed close to each other.
The connection point branch must be as short as possible.
In the design of USB interface circuit, in order to ensure the performance of USB, the
following principles are recommended in circuit design: