Pcm* And I2C Interfaces - Quectel RG255C-GL Hardware Design

Table 10: Pin Definition of Main UART
Pin Name Pin No.
RXD 11
TXD 13
CTS 23
RTS 25
The signal level of main UART is 3.3 V. When connecting to MCU, you need to pay attention to the signal
direction. The reference circuit is shown as below:
MCU
Voltage level: 3.3 V
⚫
NOTE
AT+IPR can be used to set the baud rate of the main UART, and AT+IFC can be used to set the hardware
flow control (hardware flow control is disabled by default). See document [3] for details.
4.4. PCM* and I2C Interfaces
RG255C-GL Mini PCIe provides one Pulse Code Modulation (PCM) digital interface and one I2C
interface.
RG255C-GL_Mini_PCIe_Hardware_Design
I/O Description
DI Receive
DO Transmit
DI Clear to send signal to the module
Request to send signal from the
DO
module
TXD
RXD
RTS
CTS
GND
Figure 8: Reference Circuit of Power Supply
5G Module Series
Comment
3.3 V power domain.
3.3 V power domain.
3.3 V power domain.
3.3 V power domain.
Module
TXD
RXD
RTS
CTS
GND
Voltage level: 3.3 V
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