Pcm And I2C Interfaces - Quectel EC200T Series Hardware Design

The following table shows the pin definition of the main UART interface.
Table 9: Pin Definition of Main UART Interface
Pin Name
UART_RX
UART_TX
UART_CTS
UART_RTS
The signal level of main UART interface is 3.3 V. When connecting to the peripheral MCU/RAM,
customers need to pay attention to the signal direction. The reference circuit is as follows:
MCU/ARM
Voltage level: 3.3 V

3.9. PCM and I2C Interfaces

EC200T Series Mini PCIe 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.
EC200T_Series_Mini_PCIe_Hardware_Design
Pin No. I/O
11 DI
13 DO
23 DI
25 DO
TXD
RXD
RTS
CTS
GND
Figure 7: Reference Circuit of Power Supply
LTE Standard Module Series
EC200T Series Mini PCIe Hardware Design
Power Domain Description
3.3 V receive
3.3 V transmit
3.3 V clear to send
3.3 V request to send
Module
UART_TXD
UART_RXD
UART_RTS
UART_CTS
GND
Voltage level: 3.3 V
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