General Purpose I/O Interface - Huawei ME909u-521 Hardware Manual

HUAWEI ME909u-521 LTE LGA Module
Hardware Guide
The ME909u-521 module PCM interface enables communication with an external
codec to support linear format.
Figure 3-17 Circuit diagram of PCM interface (ME909u-521 module is used as PCM
master)

3.9 General Purpose I/O Interface

The ME909u-521 module provides 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 GPIO output signal. About the details of
GPIO
Interface
Table 3-10 Signals on the GPIO interface
Pin No. Pin
Name
51, 55, GPIO
105, 109,
113
Issue 05 (2017-12-15)
 PCM_SYNC: Output when PCM is in master mode;
 PCM_CLK: Output when PCM is in master mode;
 The PCM function of ME909u-521 module 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 ME909u-521 module.
command, see the HUAWEI ME909u-521 LTE LGA Module AT Command
Specification.
Pad Description
Type
I/O General Purpose I/O
pins. The function of
these pins has not
been defined.
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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
Typ. Max. Comments
(V) (V)
1.8 1.8 -
- 0.45 -
1.8 2.1 -
- 0.63 -
40