User's Manual

UMTS/HSDPA Module Series
UC15 Hardware Design
UC15_Hardware_Design Confidential / Released 35 / 78
The reset scenario is illustrated as the following figure.
Figure 13: Timing of Resetting Module
The low-level pulse through the RESET_N pin cannot last for more than 0.2s, otherwise the module will
be powered off.
3.9. UART Interface
The module provides one 7-wire UART interface, and is designed as the DCE (Data Communication
Equipment), following the traditional DCE-DTE (Data Terminal Equipment) connection. UART interface
supports 300, 600, 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200, 230400, 460800 and
921600bps baud rate. The default is 115200bps, while autobauding is not supported. This interface can
be used for data transmission, AT communication and firmware upgrade.
Table 10: Pin Definition of the UART Interface
Pin Name Pin No. I/O Description Comment
RI 55 DO Ring indicator. 2.6V power domain.
DCD 56 DO Data carrier detection. 2.6V power domain.
NOTE