Product Info

LTE Standard Module Series
EG91 Series Hardware Design
EG91_Series_Hardware_Design
29 / 102
ADC0
24
AI
General-purpose
analog to digital
converter
Voltage range:
0.3V to VBAT_BB
If unused, keep it
open.
SPI Interface
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
SPI_CLK
26
DO
Clock signal of SPI
interface
V
OL
max=0.45V
V
OH
min=1.35V
1.8V power domain.
If unused, keep it
open.
SPI_MOSI
27
DO
Master output slave
input of SPI
interface
V
OL
max=0.45V
V
OH
min=1.35V
1.8V power domain.
If unused, keep it
open.
SPI_MISO
28
DI
Master input slave
output of SPI
interface
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.
RF Interfaces
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
ANT_GNSS
49
(EG91-
NA/-NS/
-VX/-EX/
-NAX/
-AUX)
AI
GNSS antenna pad
50Ω impedance.
If unused, keep it
open.
The pin is defined as
ANT_DIV on
EG91-E.
ANT_DIV
49
(EG91-E)
56
(EG91-
AI
Receive diversity
antenna pad
50Ω impedance.
If unused, keep it
open.
Pin 56 is reserved on
NA/-NS/
EG91-E.
-VX/-EX/
-NAX)
ANT_MAIN
60
IO
Main antenna pad
50Ω impedance.
Other Pins
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
AP_READY
19
DI
Application
processor sleep
state detection
V
IL
min=-0.3V
V
IL
max=0.6V
V
IH
min=1.2V
1.8V power domain.
If unused, keep it
open.