Users Manual

GSM/GPRS Module Series
M66 Hardware Design
M66_Hardware_Design Confidential / Released 23 / 82
3.2. Operating Modes
The table below briefly summarizes the various operating modes in the
following chapters.
Table 5: Overview of Operating Modes
BT_
ANT
26 IO BT antenna pad Impedance of 50Ω
If unused,
keep this pin
open.
Transmitting Signal Indication
PIN Name PIN No. I/O Description DC Characteristics Comment
RFTXMON 25 DO
Transmission signal
indication
V
OH
min=
0.85×VDD_EXT
V
OL
max=
0.15×VDD_EXT
If unused,
keep this pin
open.
Other Interface
PIN Name PIN No. I/O Description DC Characteristics Comment
RESERVED 15
Keep these
pins open.
Mode Function
Normal Operation
GSM/GPRS
Sleep
After enabling sleep mode by AT+QSCLK=1, the module will
automatically enter into Sleep Mode if DTR is set to high level
and there is no interrupt (such as GPIO interrupt or data on
UART port). In this case, the current consumption of module
will reduce to the minimal level.
During Sleep Mode, the module can still receive paging
message and SMS from the system normally.
GSM IDLE
Software is active. The module has registered to the GSM
network, and the module is ready to send and receive GSM
data.
GSM TALK
GSM connection is ongoing. In this mode, the power
consumption is decided by the configuration of Power Control
Level (PCL), dynamic DTX control and the working RF band.