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FIBOCOM SQ806-W Series Hardware Guide
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USB_DP and USB_DM signal cables are required to be parallel and equal in length
(differential cable length controlled within 2mm), while the right-angle route shall be
avoided, and differential 90Ω impedance shall be controlled.
USB2.0 differential signal cable is laid on the signal layer nearest to the ground, with well
grounded.
3)
For the reference circuit design DC-DC that supports the OTG function, please use the 5V
output.
Table 3-7 Module’s internal USB cable length
Pin Name
Pin #
Length (mm)
Length Error (DP-DM)
USB_DP
14
29.37
-
0.53
USB_DM
13
30.00
3.4
UART
The module defines three UART ports, all are 1.8V voltage domain. Its pin definition is as follows:
Table 3-8 UART pin definition
Pin Name
Pin #
I/O
Description
Note
UART5_TX
34
DO
UART5 data transmission
-
UART5_RX
35
DI
UART5 data reception
-
UART5_CTS
36
DI
UART5 clear to send
-
UART5_RTS
37
DO
UART5 request to send
-
UART2_RX
93
DI
UART2 data reception
Debug serial port
UART2_TX
94
DO
UART2 data transmission
UART4_RX
225
DI
UART4 data reception
-
UART4_TX
226
DO
UART4 data transmission
-
