UMTS/HSPA+ Standard Module Series
UC200T-GL Mini PCIe Hardware Design
UC200T-GL_Mini_PCIe_Hardware_Design 22 / 51
3.6.1. Main UART Interface
The main UART interface supports 9600bps, 19200bps, 38400bps, 57600bps, 115200bps and
230400bps baud rates, and the default is 115200bps. This interface supports RTS and CTS hardware
flow control, and can be used for AT command communication and data transmission.
The following table shows the pin definition of the main UART interface.
Table 7: Pin Definition of Main UART Interface
The signal level of main UART interface is 3.3V. When connecting to the peripheral MCU/RAM,
customers need to pay attention to the signal direction. The reference circuit is as follows:
MCU/ARM
TXD
RXD
UART_RXD
UART_TXD
UART_RTS
UART_CTS
RTS
CTS
GND
Module
GND
Voltage level: 3.3V
Voltage level: 3.3V
Figure 4: Reference Circuit of Power Supply
3.7. USB Interface
UC200T-GL Mini PCIe provides one integrated Universal Serial Bus (USB) interface which complies with
USB 2.0 specification. It can only be used as a slave device. Meanwhile, it supports high speed (480Mbps)
mode and full speed (12Mbps) mode. The USB interface is used for AT command communication, data
Pin Name Pin No. I/O Power Domain Description
UART_RX 11 DI 3.3V UART receive data
UART_TX 13 DO 3.3V UART transmit data
UART_CTS 23 DI 3.3V UART clear to send
UART_RTS 25 DO 3.3V UART request to send
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