Uart Interface; Overview - Huawei ME909u-523 Hardware Manual
Lte lga module
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Also See for ME909u-523:
- Hardware migration manual (70 pages) ,
- Application manual (104 pages) ,
- Acceptance inspection manual (12 pages)
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HUAWEI ME909u-523 LTE LGA Module
Hardware Guide
Figure 3-13 Driving circuit
3.5 UART Interface
3.5.1 Overview
The ME909u-523 module provides two UART interfaces for asynchronous
communication channels. They are UART0 (4-wire UART) and UART1 (4-wire
UART).
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 3-7 lists the UART interface signals.
Table 3-7 UART interface signals
PIN
Pin Name
No.
76
UART0_TX
78
UART0_RX
74
UART0_RTS
80
UART0_CTS
1
UART1_TX
Issue 01 (2014-05-24)
Pad
Description
Type
O
UART0 transmit
output
I
UART0 receive
data input
O
UART0 ready for
receive
I
UART0 clear to
send
O
UART1 transmit
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
1.17
IH
–0.3
V
IL
V
1.35
OH
V
0
OL
V
1.17
IH
–0.3
V
IL
V
1.35
OH
Typ. (V)
Max. (V)
1.8
1.8
-
0.45
1.8
2.1
-
0.63
1.8
1.8
-
0.45
1.8
2.1
-
0.63
1.8
1.8
33
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