NB-IoT
Module Series
BC660K-GL Hardware Design
BC660K-GL_Hardware_Design 21 / 57
edge of PSM_EINT or by your sending the command
AT
to it via the main UART port.
3.4.2. Deep Sleep
The module consumes extremely low current in Deep Sleep mode (typical value: 800 nA). The main
purpose of Deep Sleep is to reduce the power consumption of the module and prolong the power supply
duration of the battery. In this mode, the serial port does not work.
The following figure shows the power consumption of the module in different modes.
P
ow
er
C
on
su
m
pt
io
n
PSM
Idle
T
ra
ns
m
is
si
on
R
ec
ep
tio
n
T3324
T3412
TAU
UE inactive time
Idle
Figure 3: Module Power Consumption in Different Modem Modes
When the modem remains in PSM and the AP is in idle mode, the module will enter Deep Sleep mode.
The procedure of the modem entering PSM is as follows:
The modem requests to enable PSM with an
ATTACH REQUEST
or
TAU REQUEST
message during
ATTACH or TAU (Tracking Area Update) procedure. Then the network accepts the request and provides
an active time value (T3324) to the modem and the mobile reachable timer starts. When the T3324 timer
expires, the modem enters PSM. Please note that the module cannot request entering PSM when
establishing an emergency attachment or initializing the PDN (Public Data Network) connection
When the module is in Deep Sleep mode, it can be woken up in the following cases:
⚫
After the T3412 timer expires, the module will exit from Deep Sleep automatically.
⚫
Send an AT command to the module (this AT command will be lost), pull down the MAIN_RXD, and
in falling edge, the module will be woken up from Deep Sleep.
⚫
Pulling down PSM_EINT (falling edge) will wake up the module from Deep Sleep.
The timing of waking up
the module from PSM is illustrated below.
