Service Guide

LTE Standard Module Series
EG91_Series_Hardware_Design
30
/ 105
9
Pin 49 is defined as ANT_GNSS on EG91-AUX/-EX/-NA/-NAL/-NAX/-NAXD/-NAXDL/-VX, while it is defined as ANT_DIV
on EG91-E.
10
Pin 56 is RESERVED on EG91-E, while is defined as ANT_DIV on EG91-EX/-NA/-NAL/-NAX/-NAXD/-NAXDL/-VX.
Rx-diversity antenna is not supported on EG91-AUX.
Pin Name
Pin
No.
I/O Description
DC
Characteristics
Comment
I2C_SCL 40 OD
I2C serial clock (for
external codec)
An external pull-up to
1.8 V is required.
If unused, keep it open.
I2C_SDA 41 OD
I2C serial data
(for external codec)
ADC Interface
Pin Name
Pin
No.
I/O Description
DC
Characteristics
Comment
ADC0 24 AI
General-purpose
ADC interface
Voltage range:
0.3 V to VBAT_BB
If unused, keep it open.
SPI Interface
Pin Name
Pin
No.
I/O Description
DC
Characteristics
Comment
SPI_CLK 26 DO SPI clock
V
OL
max = 0.45 V
V
OH
min = 1.35 V
1.8 V power domain.
If unused, keep it open.
SPI_MOSI 27 DO
SPI master-out
slave-in
SPI_MISO 28 DI
SPI master-in
slave-out
V
IL
min = -0.3 V
V
IL
max = 0.6 V
V
IH
min = 1.2 V
V
IH
max = 2.0 V
RF Interfaces
Pin Name
Pin
No.
I/O Description
DC
Characteristics
Comment
ANT_GNSS
9
49 AI
GNSS antenna
interface
50 Ω impedance.
If unused, keep it open.
ANT_DIV
10
56 AI
Diversity antenna
interface
50 Ω impedance.
If unused, keep it open.
ANT_MAIN 60 AIO
Main antenna
Interface
50 Ω impedance.