HUAWEI MU709 Series HSPA+ LGA Module
Hardware Guide
Description of the Application Interfaces
Issue 09 (2017-12-15)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
33
Pin
No.
Pin Name
Pad
Type
Description
Parameter
Min.
(V)
Typ.
(V)
Max.
(V)
debugging
V
IL
–0.3
-
0.63
76
UART0_TX
O
UART0 transmit output
V
OH
1.35
1.8
2.1
V
OL
0
-
0.45
78
UART0_RX
I
UART0 receive data input
V
IH
1.26
1.8
2.1
V
IL
–0.3
-
0.63
77
UART0_RING
O
UART0 ring indicator
V
OH
1.35
1.8
2.1
V
OL
0
-
0.45
74
UART0_RTS
O
UART0 ready for receive
V
OH
1.35
1.8
2.1
V
OL
0
-
0.45
79
UART0_DTR
I
UART0 data terminal ready
V
IH
1.26
1.8
2.1
V
IL
–0.3
-
0.63
80
UART0_CTS
I
UART0 clear to send
V
IH
1.26
1.8
2.1
V
IL
–0.3
-
0.63
75
UART0_DCD
O
UART0 data carrier detect
V
OH
1.35
1.8
2.1
V
OL
0
-
0.45
73
UART0_DSR
O
UART0 data set ready
V
OH
1.35
1.8
2.1
V
OL
0
-
0.45
3.5.2 Circuit Recommended for the UART Interface
Figure 3-12
Connection of the UART interface in the MU709 module (DCE) with the host
(DTE)
UART0_RX
UART0_TX
UART0_RTS
UART0_CTS
UART1_RX
UART1_TX
UART0_DTR
UART0_DSR
UART0_DCD
UART0_RING
Module
(DCE)
test point
test point
RXD
TXD
CTS
RTS
DTR
DSR
DCD
Application
Device
(DTE)
RING
