Product Info

LTE Module Series
EC25 Hardware Design
EC25_Hardware_Design 26 / 112
6. Pads 24~27 are multiplexing pins used for audio design on the EC25 module and BT function on the
BT module.
7. Keep all RESERVED pins and unused pins unconnected.
8. GND pads 85~112 should be connected to ground in the design, and RESERVED pads 73~84
should not be designed in schematic and PCB decal, and these pins should be served as a keep out
area.
9. “
*
” means under development.
3.3. Pin Description
The following tables show the pin definition of EC25 modules.
Table 3: I/O Parameters Definition
Table 4: Pin Description
Type Description
IO Bidirectional
DI Digital input
DO Digital output
PI Power input
PO Power output
AI Analog input
AO Analog output
OD Open drain
Power Supply
Pin Name Pin No. I/O Description DC Characteristics Comment
VBAT_BB 59, 60 PI
Power supply for
module’s baseband
part
Vmax=4.3V
Vmin=3.3V
Vnorm=3.8V
It must be able to
provide sufficient
current up to 0.8A.