Service Guide

LTE Standard Module Series
EG915U_Series_Hardware_Design 21 / 81
connection of
multiple
peripherals
except for codec
IC
PCM Interface
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
PCM_SYNC
5
DI
PCM data frame sync
V
IL
min = -0.3 V
V
IL
max = 0.6 V
V
IH
min = 1.26 V
V
IH
max = 2.0 V
1.8 V power
domain.
If unused, keep it
open.
Support slave
mode only.
PCM_CLK
4
DI
PCM clock
V
IL
min = -0.3 V
V
IL
max = 0.6 V
V
IH
min = 1.26 V
V
IH
max = 2.0 V
PCM_DIN
6
DI
PCM data input
V
IL
min = -0.3 V
V
IL
max = 0.6 V
V
IH
min = 1.26 V
V
IH
max = 2.0 V
PCM_DOUT
7
DO
PCM data output
V
OL
max = 0.45 V
V
OH
min = 1.35 V
RF Antenna Interface
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
ANT_MAIN
60
AIO
Main antenna interface
50 Ω impedance
ANT_BT/
WIFI_SCAN
56
AIO
The shared interface for
Bluetooth and Wi-Fi
Scan
50 Ω impedance.
If unused, keep it
open
GRFC Antenna Tuner Control Interface*
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
GRFC1
76
DO
Generic RF Controller
If unused, keep it
open.
GRFC2
77
DO
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
Master mode
only.
SPI_CS
25
DO
SPI chip select
V
OL
max = 0.45 V
V
OH
min = 1.35 V