Uart Interface; Overview - Huawei ME909 Series Hardware Manual

HUAWEI ME909 Series LTE LGA Module
Hardware Guide
Figure 3-12 Driving circuit

3.5 UART Interface

3.5.1 Overview

The ME909 module is projected to provide two UART interfaces for asynchronous
communication channels. They are UART0 (4-wire UART) and UART1 (4-wire UART).
But now due to software schedule, UART0 can be only used as 2-wire UART, and
UART1 is not supported at the moment.
The UART2 (2-wire UART) is for debugging only. Customer should layout two test
points for them in case system trouble shooting and analysis.
Table 3-7 lists the UART interface signals.
Table 3-7 UART interface signals
Pin
No.
76
78
74
80
1
2
3
Issue V0.3 (2013-05-21)
Pin Name I/
O
UART0_TX O
UART0_RX I
UART0_RTS O
UART0_CTS I
UART1_TX O
UART1_RTS O
UART1_CTS I
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Description of the Application Interfaces
Description
UART0 transmit output
UART0 receive data input
UART0 Ready for receive
UART0 Clear to Send
UART1 transmit output
UART1 Ready for receive
UART1 Clear to Send
DC Characteristics (V)
Min. Typ. Max.
–0.3
1.8 2.1
–0.3
1.8 2.1
–0.3
1.8 2.1
–0.3
1.8 2.1
–0.3
1.8 2.1
–0.3
1.8 2.1
–0.3
1.8 2.1
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