UMTS/HSDPA Module
UC15 Hardware Design
UC15_Hardware_Design Confidential / Released 30 / 72
Figure 9: Reference Circuit of
RESET_N b
y Using Driving Circuit
The reset scenario is illustrated as the following figure.
V
IL
< 0.3V
V
IH
> 1.6V
VBAT
50<t<200ms
RESETTING
Module
Status
RUNNING
RESET_N
RUNNING
≥
5s
STATUS
>3s
Figure 10: Timing of Resetting Module
Use the RESET_N only when turning off the module by the command “AT+QPOWD” and the PWRKEY
pin failed.
3.9. UART Interface
The module provides one UART interfaces. It consists of flexible 7-wire serial interface. The following
shows the different features. The module is designed as the DCE (Data Communication Equipment),
following the traditional DCE-DTE (Data Terminal Equipment) connection.
NOTE
