General Purpose I/O Interface - Huawei ME909 Series Hardware Manual

HUAWEI ME909 Series LTE LGA Module
Hardware Guide
Figure 3-16 Circuit diagram of the interface of the PCM (ME909 is used as PCM master)

3.9 General Purpose I/O Interface

The ME909 module provides 5 GPIO pins for customers to use for controlling signals
which are worked at 1.8 V CMOS logic levels. Customers can use AT command to
control the state of logic levels of 5 GPIO output signal. See the
ME909u-521 LTE LGA Module AT Command Interface
Table 3-11 Signals on the GPIO interface
Pin No.
51, 55, 105, 109,
113
Issue V0.3 (2013-05-21)
 PCM_SYNC: Output when PCM is in master mode;
PCM_CLK: Output when PCM is in master mode;

 The PCM function of ME909 is only supported in master mode.
 It is recommended that a TVS be used on the related interface, to prevent electrostatic
discharge and protect integrated circuit (IC) components.
 The signal level of CODEC must match that of the ME909 module.
Pin
Name
GPIO
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
Description of the Application Interfaces
I/O Description
I/O General I/O pins
HUAWEI
Specification.
DC Characteristics (V)
Min. Typ.
–0.3
1.8
Max.
2.1
36