UMTS/HSPA Module Series
UG95 Hardware Design
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The following figure shows the connection between the module and application processor.
RXD
TXD
RI
DTR
AP_READY
TXD
RXD
EINT
GPIO
GPIO
Module
Processor
GND
GND
Figure 3: UART Sleep Application
The RI of module is used to wake up the processor, and AP_READY will detect the sleep state of
processor (can be configured to high level or low level detection). You should pay attention to the level
match shown in dotted line between module and processor. Drive DTR pin to low level to wake up the
module.
In sleep mode for UART application, the UART port is not accessible.
3.5.1.2. USB Application with Suspend Function
If application processor communicates with module via USB interface, and processor supports USB
suspend/resume function, the following preconditions can let the module enter into the sleep mode.
Execute AT command
AT+QCFG="uart/power",1,2
to close internal UART port.
Execute AT command
AT+QCFG="uart/power",0,0
to set UART into auto on/off mode.
Execute AT command
AT+QSCLK=1
to enable the sleep mode.
The processor’s USB bus which is connected with the module USB interface enters into suspended
state.
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