Quectel EC200A Series User Manual

LTE Standard Module Series
Clock and mode can be configured by AT command, and the default configuration is short frame
synchronization format with 2048 kHz PCM_CLK and 8 kHz PCM_SYNC.
The following is a reference design for the PCM and I2C interfaces with external Codec chip
PCM_DIN
PCM_DOUT
PCM_SYNC
PCM_CLK
I2C_SCL
I2C_SDA
Module
1.8 V
4.7K 4.7K
BCLK
LRCK
DAC
ADC
SCL
SDA
BIAS
MICBIAS
INP
INN
LOUTP
LOUTN
Codec
22R
33 pF
22R
22R
33 pF
22R
33 pF
Figure 22: PCM and I2C Interface Circuit Reference Design
I2C_SCL
41
OD
I2C serial clock
Used for external codec.
An external 1.8 V pull-up
resistor is needed.
I2C_SDA
42
OD
I2C serial data
It is recommended to reserve the RC (R = 22 Ω, C = 33 pF) circuit on the PCM signal line and the
capacitor should be placed close to the module, especially on PCM_CLK.
NOTE

Quectel EC200A Series Specifications

General

Brand	Quectel
Model	EC200A Series
Category	Control Unit
Language	English