Product Info

LTE Module Series
EC21 Hardware Design
EC21_Hardware_Design
3-28
/ 105
1. “*” means under development.
2. Pads 24~27 are multiplexing pins used for audio design on EC21 module and BT function on FC20
module.
3.3. Operating Modes
The table below briefly summarizes the various operating modes referred in the following chapters.
Table 5: Overview of Operating Modes
Mode
Details
Normal
Operation
Idle
Software is active. The module has registered on the network, and it is
ready to send and receive data.
Talk/Data
Network connection is ongoing. In this mode, the power consumption is
decided by network setting and data transfer rate.
open.
AP_READY
2
DI
Application
processor sleep
state detection
V
IL
min=-0.3V
V
IL
max=0.6V
V
IH
min=1.2V
V
IH
max=2.0V
1.8V power domain.
If unused, keep it
open.
USB_BOOT Interface
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
USB_BOOT
115
DI
Force the module to
enter into
emergency
download mode.
V
IL
min=-0.3V
V
IL
max=0.6V
V
IH
min=1.2V
V
IH
max=2.0V
1.8V power domain.
Active high.
If unused, keep it
open.
RESERVED Pins
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
RESERVED
3, 18, 23,
43, 55,
73~84,
113, 114,
116, 117,
140-144.
Reserved
Keep these pins
unconnected.
NOTES