Control And Indicator Signals - Quectel EM05 Hardware Design

The following figure shows a reference design of PCM interface with external codec IC.
PCM_CLK
PCM_SYNC
PCM_OUT
Module
Figure 22: Reference Circuit of PCM Application with Audio Codec
NOTES
"*" means under development.
1.
2. It is recommended to reserve a RC (R=22Ω, C=22pF) circuit on the PCM lines, especially for
PCM_CLK.
3. EM05 works as a master device pertaining to I2C interface.
4. EM05-CML does not support I2C interface.

3.11. Control and Indicator Signals

The following table shows the pin definition of control and indicator signals.
Table 12: Pin Definition of Control and Indicator Signals
Pin No. Pin Name
8 W_DISABLE1#
10 LED#
23 WOWWAN#
26 W_DISABLE2#*
EM05_Hardware_Design
PCM_IN
I2C_SCL
I2C_SDA
1.8V
I/O Power Domain
DI 3.3V
OD
OD
DI 1.8V
MICBIAS
INP
BCLK
INN
LRCK
DAC
ADC
LOUTP
SCL
SDA
LOUTN
Codec
Description
Airplane mode control. Active low.
It is an open drain and active low signal.
It is used to indicate the RF status of the
module.
A signal to wake up the host.
It is open drain and active low.
GPS control. Active low.
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EM05 Hardware Design
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