Smart Module Series
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The following table shows the pin definition of USB1.
Table 10: Pin Definition of USB1 Interface
For the design of USB 2.0 interface, it is recommended to connect the module
’s USB_ID directly to the
USB_ID pin of the USB connector for USB ID detection. When a device is plugged into the external Micro
USB connector, the USB_ID pin of the module will be pulled down to make the module enter host mode.
USB_DP
USB_DM
USB_VBUS
1
2
3
4
5
USB_DP
USB_DM
USB_VBUS
USB_ID
GND
G
N
D
G
N
D
G
N
D
G
N
D
6
7
8
9
100 nF
Module
C1
D1
D2
D3
ESD
ESD ESD
USB_ID
D4
ESD
GND
Figure 11: Reference Design for USB1 Interface
Pin Name
Pin No.
I/O
Description
Comment
USB_VBUS
141, 142
PI
Charging power input;
USB 5 V power input;
USB/adaptor insertion
detect
Vmax = 9.20 V
Vmin = 4.50 V
Vnom = 5.00 V
USB_DM
13
AIO
USB differential data bus (-)
USB 2.0 standard compliant.
9
0 Ω differential impedance.
Supports USB OTG mode, but
does not support USB hub.
USB_DP
14
AIO
USB differential data bus (+)
USB_ID
16
DI
USB ID detect
High level by default.
If not used, keep it open.