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15
Hardware Development Guide
ME3616
output
SPI_MOSI
5
O
SPI main output slave
input
1.8V
If not used, NC
SPI_SCLK
6
O
SPI clock
1.8V
If not used, NC
SPI_CS
3
O
SPI segment
1.8V
If not used, NC
USB Interface
(
Used for debug, recommended to NC
)
USB_VBUS
33
PI
USB Power
3.3V
Optional, used for debug
USB_DM
39
IO
USB differential data
bus
Require differential
impedance of 90
Ω
USB_DP
40
IO
USB differential data
bus
Require differential
impedance of 90
Ω
Other pins
WAKEUP_IN
18
DI
External device
wakeup module
VBAT voltage
domain
Used for MCU to wakeup
module. If module in PSM
status,
Falling edge can
wakeup the module
WAKEUP_OUT
16
DO
Output wakeup signal,
wake up the external
devices
1.8V
Used for module to wakeup
MCU(such as this pin will
give signal when there is
downlink data )
AP_READY
11
DI
AP is Ready
1.8V
GPIO
34,35
IO
General input/output
1.8V
If not used, NC
NC
24
Not connected
No need connection
external
2.4.
W
ORKING MODE
There is three working mode for module ME3616:
1.
Connected mode : Network connection is ongoing, and you can send/receive data, the power
consumption is decided by network setting and data transfer rate. Module can enter Idle/PSM mode in this status.
2.
Idle mode: Module is in idle mode, has registered to network, can receive paging information. Module
can enter Connected/PSM mode in this status.
3.
PSM(Power save mode):Only module’s RTC works in this mode. In this PSM mode, module does not
connect to network, and can’t receive any network paging information. The current consumption of the module
will be reduced to the minimal level. For the network side, the module UE is in an unreachable offline state at this
time. The UE will exit the PSM mode only when the TAU period request timer (T3412) times out or the UE has MO
service to process
The mode switch is shown in the figure below: