Power Saving; Sleep Mode; Uart Application - Quectel UC15 Hardware Design

UMTS Idle
UMTS
Talk/Data
HSDPA Idle
HSDPA Data
Minimum AT+CFUN=0 command can set the module entering into a minimum functionality
Functionality mode without removing the power supply. In this case, both RF function and USIM
Mode card will be invalid.
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

Sleep Mode

call and TCP/UDP data from the network normally. Any URC can be output even the
module in Sleep Mode.
In this mode, the power management unit shuts down the power supply for the
Power Down baseband part and RF part. Software is not active. The serial interface is not
Mode accessible. Operating voltage (connected to VBAT_RF and VBAT_BB) remains
applied.

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.
UC15_Hardware_Design
Software is active. The module has registered to the UMTS
network and the module is ready to send and receive data.
UMTS connection is ongoing. In this mode, the power
consumption is decided by network setting (e.g. TPC pattern) and
data transfer rate.
Software is active. The module has registered to the HSDPA
network and the module is ready to send and receive 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.
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UMTS/HSDPA Module Series
UC15 Hardware Design
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