UMTS/HSPA+ Module Series
UC200A-GL_Hardware_Design 23 / 78
3.2.1. UART Application
If the host communicates with module via UART interface, the following preconditions should be met to
enable the module enter sleep mode.
⚫
Execute
AT+QSCLK=1
to enable sleep mode.
⚫
Drive MAIN_DTR to high level.
The following figure shows the connection between the module and the host.
MAIN_RXD
MAIN_TXD
MAIN_RI
MAIN_DTR
AP_READY
TXD
RXD
EINT
GPIO
GPIO
Module
Host
GND
GND
Figure 2: Sleep Mode Application via UART
⚫
Driving MAIN_DTR to low level by host will wake up the module.
⚫
When the module has a URC to report, the URC will trigger the behavior of MAIN_RI pin. Please
refer to
Chapter 4.9
for details about MAIN_RI behavior.
3.2.2. USB Application with USB Remote Wakeup Function
If the host supports USB Suspend/Resume and remote wakeup functions, the following three
preconditions must be met to let the module enter sleep mode.
⚫
Execute
AT+QSCLK=1
to enable the sleep mode.
⚫
Ensure the MAIN_DTR is kept at high level or kept open.
⚫
The host’
s USB bus, which is connect
ed with the module’s USB interface, enters
Suspend state.