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SIM800_Hardware Design_V1.10 41 2018-08-13

SIM800 PCM interface only supports master mode, data length is 16 bits (linear), and PCM clock rate is 256

KHz.

Table 19: PCM Specification

Note: User can use AT command control PCM interface, for details please refer to document [1].

4.10.1. PCM Interface

Refer to the following figure for PCM design:

Module

CODEC

PCMIN

PCMSYNC

PCMOUT

PCMCLK

GND

PCM_IN

PCM_OUT

PCM_SYNC

PCM_CLK

Figure 36: PCM reference circuit

4.11. Keypad Interface

SIM800 consists of 5 keypad column outputs and 5 keypad row inputs, and it can support two kinds of

connections, the traditional 5*5 keypad matrix and the extended 5*5*2 keypad matrix.

Feature Specification

Line Interface Format Linear(Fixed)

Data length 16bits(Fixed)

PCM Clock/Sync Source

Master Mode(Fixed)

PCM Clock Rate

256Khz(Fixed)

PCM Sync Format

Short sync/Long sync both support

Zero Padding/Sign extension Default Zero Padding

Data Ordering MSB/LSB both support

SimCom SIM800 User Manual

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