User's Manual

UMTS/HSDPA Module Series
UC15 Hardware Design
UC15_Hardware_Design Confidential / Released 25 / 78
3.5. Power Saving
3.5.1. Sleep Mode
UC15 is able to reduce its current consumption to a minimum value during the sleep mode. The following
section describes power saving procedure of UC15.
3.5.1.1. UART Application
If application processor communicates with module via UART interface, the following preconditions can
let the module enter into the sleep mode.
 Execute AT command AT+QSCLK=1 to enable the sleep mode.
 Drive DTR to high level.
The following figure shows the connection between the module and application processor.
UMTS Idle
Software is active. The module has registered to the UMTS
network and the module is ready to send and receive data.
UMTS
Talk/Data
UMTS connection is ongoing. In this mode, the power
consumption is decided by network setting (e.g. TPC pattern) and
data transfer rate.
HSDPA Idle
Software is active. The module has registered to the HSDPA
network and the module is ready to send and receive data.
HSDPA Data
HSDPA data transfer is ongoing. In this mode, the power
consumption is decided by network setting (e.g. TPC pattern) and
data transfer rate.
Minimum
Functionality
Mode
AT+CFUN=0 command can set the module entering into a minimum functionality
mode without removing the power supply. In this case, both RF function and USIM
card will be invalid.
Sleep Mode
In this mode, the current consumption of the module will be reduced to the minimal
level. During this mode, the module can still receive paging message, SMS, voice
call and TCP/UDP data from the network normally. Any URC can be output even the
module in Sleep Mode.
Power Down
Mode
In this mode, the power management unit shuts down the power supply for the
baseband part and RF part. Software is not active. The serial interface is not
accessible. Operating voltage (connected to VBAT_RF and VBAT_BB) remains
applied.