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HUAWEI ME909s Series LTE Mini PCIe Module
Hardware Guide
Table 3-5 UART interface signals
Pin
Pin Description
No.
3
UART_CTS
5
UART_RTS
17
UART_RX
19
UART_TX
3.5.2 Circuit Recommended for the UART Interface
Figure 3-9 Connection of the UART interface in the ME909s Mini PCIe module (DCE)
with the host (DTE)
3.6 USB Interface
The ME909s Mini PCIe module is compliant with USB 2.0 protocol. The USB interface
is powered directly from the VCC_3V3 supply. The USB input/output lines are
Issue 02 (2016-09-07)
Pad
Description
Type
I
UART clear to send
O
UART request to send
UART receive data input
I
UART transmit output
O
Module
(DCE)
UART_TX
UART_RX
UART_RTS
UART_CTS
The UART cannot wake up the module from the sleep status, and you can pull up the
WAKEUP_IN signal for 1s instead.
The level of RS-232 transceivers must match that of the the ME909s Mini PCIe module.
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Copyright © Huawei Technologies Co., Ltd.
Description of the Application Interfaces
Min.
Parameter
(V)
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
Application Device
(DTE)
RXD
TXD
CTS
RTS
Typ.
Max.
(V)
(V)
1.8
1.98
-
0.63
1.8
1.98
-
0.45
1.8
1.98
-
0.63
1.8
1.98
-
0.45
24
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