Power Saving; Sleep Mode; Uart Application - Quectel UC20 Hardware Design

Sleep Mode

Power Down
Mode

3.5. Power Saving

3.5.1. Sleep Mode
UC20 is able to reduce its current consumption to a minimum value during the sleep mode. The following
section describes UC20's power saving procedure.

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.
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
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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.
In this mode, the power management unit shuts down the power supply. Only the
power supply for RTC remains. Software is not active. The serial interface is not
accessible. Operating voltage (connected to VBAT_RF and VBAT_BB) remains
applied.
Module
RXD
TXD
RI
DTR
AP_READY
GND
Figure 3: UART Sleep Application
TXD
RXD
EINT
GPIO
GPIO
GND
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UMTS/HSPA Module Series
UC20 Hardware Design
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