To Next Page

To Previous Page

UMTS/HSPA Module Series

UC20 Hardware Design

UC20_Hardware_Design Confidential / Released 37 / 82

Large

Capacitance

Capacitor

Module

RTC

Core

VRTC

Figure 18: RTC Supply from Capacitor

3.10. UART Interface

The module provides two UART interfaces: main UART interface and debug UART interface. The

following shows the different features.

 Main UART interface supports 9600, 19200, 38400, 57600, 115200, 230400, 460800, 921600bps

baud rate, the default is 115200bps. This interface can be used for data transmission, AT

communication or firmware upgrade.

 Debug UART interface supports 115200bps. It can be used for GNSS NMEA sentences output.

USB interface supports software debug and firmware upgrade by default.

The module is designed as the DCE (Data Communication Equipment), following the traditional

DCE-DTE (Data Terminal Equipment) connection. The following tables show the pin definition of these

two UART interfaces.

Table 9: Pin Definition of the Main UART Interface

Pin Name

Pin No.

I/O

Description

Comment

Ring indicator.

1.8V power domain.

DCD

Data carrier detection.

1.8V power domain.

CTS

Clear to send.

1.8V power domain.

NOTE

Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.