Service Guide

LTE Standard Module Series
EG91_Series_Hardware_Design
29
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V
OH
min = 1.35 V If unused, keep it open.
DCD 38 DO Data carrier detect
CTS 36 DO Clear to send
RTS 37 DI Request to send
V
IL
min = -0.3 V
V
IL
max = 0.6 V
V
IH
min = 1.2 V
V
IH
max = 2.0 V
DTR 30 DI
Data terminal ready
Sleep mode control
1.8 V power domain.
Pulled up by default.
Low level wakes up the
module.
If unused, keep it open.
TXD 35 DO Transmit
V
OL
max = 0.45 V
V
OH
min = 1.35 V
1.8 V power domain.
If unused, keep it open.
RXD 34 DI Receive
V
IL
min = -0.3 V
V
IL
max = 0.6 V
V
IH
min = 1.2 V
V
IH
max = 2.0 V
Debug UART Interface
Pin Name
Pin
No.
I/O Description
DC
Characteristics
Comment
DBG_TXD 23 DO
Debug UART
transmit
V
OL
max = 0.45 V
V
OH
min = 1.35 V
1.8 V power domain.
If unused, keep it open.
DBG_RXD 22 DI
Debug UART
receive
V
IL
min = -0.3 V
V
IL
max = 0.6 V
V
IH
min = 1.2 V
V
IH
max = 2.0 V
PCM Interface
Pin Name
Pin
No.
I/O Description
DC
Characteristics
Comment
PCM_DIN 6 DI PCM data input
V
IL
min = -0.3 V
V
IL
max = 0.6 V
V
IH
min = 1.2 V
V
IH
max = 2.0 V
1.8 V power domain.
If unused, keep it open.
PCM_DOUT 7 DO PCM data output
V
OL
max = 0.45 V
V
OH
min = 1.35 V
PCM_SYNC 5 DIO
PCM data frame
sync
V
OL
max = 0.45 V
V
OH
min = 1.35 V
V
IL
min = -0.3 V
V
IL
max = 0.6 V
V
IH
min = 1.2 V
V
IH
max = 2.0 V
1.8 V power domain. In
master mode, it is an
output signal. In slave
mode, it is an input
signal.
If unused, keep it open.
PCM_CLK 4 DIO PCM data clock
I2C Interface