Pcm Interface; Pin Description - SimCom SIM5320AL User Manual

Table 26: Control status
GPIO4 Status
Low Level
High Level
：
Note
1. When the module is powered off, make sure all digital interfaces (UART, etc) connected with peripheral devices have
no voltage higher than 0.3V. If users' design cannot meet above conditions, high level voltages maybe occur in GPIO
pins because current leakage from above digital interfaces may occur.

3.11 PCM Interface

SIM5320 provides hardware PCM interface for external codec. The PCM interface enables
communication with an external codec to support hands-free applications. SIM5320 PCM interface can be
used in two modes: the default mode is auxiliary PCM (8 KHz long sync mode at 128 KHz PCM CLK);
the other mode is primary PCM (8 KHz short sync mode at 2048 KHz PCM CLK). In short-sync
(primary PCM) mode, SIM5320 can be a master or a slave. In long-sync (auxiliary PCM) mode, SIM5320
is always a master. SIM5320 also supports 3 kinds of coding formats: 8 bits (
(linear).
Note: PCM interface is multiplexed from GPIO (default setting). The AT command "AT+CPCM" is used to switch
between PCM and GPIO functions. Please refer to document [22] and document [1] for details.

3.11.1 Pin Description

Table 27: Electronic characteristic
Pin name
PCM_CLK
PCM_SYNC
PCM_DOUT
PCM_DIN
Table 28: Pin description
Pins
SIM5320AL_User Manual_V1.01
Module operation
Flight Mode: RF is closed.
Normal Mode: RF is working.
Min
-0.3
-0.3
-0.3
-0.3
AUX_PCM
Pin No.
functionality
Smart Machine Smart Decision
DC Characteristics
Typ
2.6
2.6
2.6
2.6
Primary PCM
functionality
44

-law or A-law) and 16 bits
Max
2.9
2.9
2.9
2.9
Description
2014-08-20