MEIG SLM156 - USB Interface; USB Pin Description; USB Reference Circuit

MeiG_SLM156_Hardware Design Manual
MeiG Smart Technology Co., Ltd
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3.10 USB Interface
SLM156 provides a USB interface which complies with USB 2.0 specification and supports high-speed
(480Mbps) and full-speed (12Mbps) modes. The USB interface is used for AT command
communication, data transmission, software debugging and version upgrade.
3.10.1 USB Pin Description
SLM156 module provides a USB2.0 High-Speed interface.k
Table 9 USB interface description
Name
Pin name
I/O
Description
Note
USB_DM
50
IO
USB differential data
signal-
Require 90Ω
differential
impedance
USB_DP
49
IO
USB differential data
signal+
Require 90Ω
differential
impedance
USB_VBUS
56
PI
USB power supply, used
for USB detection
Typical value 5.0V
3.10.2 USB Reference Circuit
USB interface application reference circuit of SLM156 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 9 USB Reference Circuit