Product Info

LTE Module Series
EG21-G MINIPCIE Hardware Design
EG21-G_MINIPCIE_Hardware_Design 23 / 48
AT+IPR command can be used to set the baud rate of the main UART, and AT+IFC command can be
used to set the hardware flow control (hardware flow control is disabled by default). Please refer to
document [2] for details.
3.7. PCM and I2C Interfaces
EG21-G MINIPCIE provides one Pulse Code Modulation (PCM) digital interface and one I2C interface.
The following table shows the pin definition of PCM and I2C interfaces that can be applied in audio codec
design.
Table 9: Pin Definition of PCM and I2C Interfaces
EG21-G MINIPCIE provides one PCM digital interface, which supports 16-bit linear data format and the
following modes:
 Primary mode (short frame synchronization, works as either master or slave)
 Auxiliary mode (long frame synchronization, works as master only)
1. “*” means under development.
2.
1)
The digital audio (PCM) function is only supported on Telematics version.
In primary mode, the data is sampled on the falling edge of the PCM_CLK and transmitted on the rising
edge. The PCM_SYNC falling edge represents the MSB. In this mode, PCM_CLK supports 128KHz,
Pin No.
Pin Name
I/O
Power Domain
Description
45
PCM_CLK
1)
IO
1.8V
PCM clock signal
47
PCM_DOUT
1)
DO
1.8V
PCM data output
49
PCM_DIN
1)
DI
1.8V
PCM data input
51
PCM_SYNC
1)
IO
1.8V
PCM frame synchronization
30
I2C_SCL
DO
1.8V
I2C serial clock.
Require external pull-up to 1.8V.
32
I2C_SDA
IO
1.8V
I2C serial data.
Require external pull-up to 1.8V.
NOTES