Uart Interface; Overview - Huawei ME909u-521 Hardware Manual
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HUAWEI ME909u-521 LTE LGA Module
Hardware Guide
3.5 UART Interface
3.5.1 Overview
The ME909u-521 module provides two UART interfaces for asynchronous
communication channels. They are UART0 (4-wire UART) and UART1 (4-wire UART),
which work as high speed UART by default.
The UART2 (2-wire UART) is for debugging only. Customers should layout two test
points for them in case of system trouble shooting and analysis.
Table 3-6 lists the UART interface signals.
Table 3-6 UART interface signals
Pin
Pin Name
No.
1
UART1_TX
2
UART1_RTS
3
UART1_CTS
4
UART1_RX
28
UART2_TX
29
UART2_RX
74
UART0_RTS
76
UART0_TX
78
UART0_RX
80
UART0_CTS
Issue 05 (2017-12-15)
Pad
Description
Type
O
UART1 transmit
output
O
UART1 Ready for
receive
I
UART1 Clear to Send
I
UART1 receive data
input
O
UART2 transmit
output
I
UART2 receive data
input
O
UART0 Ready for
receive
O
UART0 transmit
output
I
UART0 receive data
input
I
UART0 Clear to Send
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
Description of the Application Interfaces
Parameter
Min.
(V)
V
1.35
OH
V
0
OL
V
1.35
OH
V
0
OL
V
1.17
IH
–0.3
V
IL
V
1.17
IH
–0.3
V
IL
V
1.35
OH
V
0
OL
V
1.17
IH
–0.3
V
IL
V
1.35
OH
V
0
OL
V
1.35
OH
V
0
OL
V
1.17
IH
–0.3
V
IL
V
1.17
IH
–0.3
V
IL
Typ.
Max.
Comments
(V)
(V)
1.8
1.8
-
-
0.45
-
1.8
1.8
-
-
0.45
-
1.8
2.1
-
0.63
-
1.8
2.1
-
-
0.63
-
1.8
1.8
-
-
0.45
-
1.8
2.1
-
-
0.63
-
1.8
1.8
-
-
0.45
-
1.8
1.8
-
-
0.45
-
1.8
2.1
-
-
0.63
1.8
2.1
-
-
0.63
-
34
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