LTE Standard Module Series
EG915U-EU_Hardware_Design 24 / 81
Pin Name
Pin No.
I/O
Description
DC
Characteristics
Comment
USB_BOOT
75
DI
Force the module into
emergency download
mode
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. Active
high.
A circuit that
enables the
module to enter
the download
mode must be
reserved.
W_DISABLE#
18
DI
Airplane mode control
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. Pulled
up by default.
When it is in low
voltage level, the
module can
enter airplane
mode. If unused,
keep it open.
AP_READY
19
DI
Application processor
ready
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
Analog Audio Interfaces
Pin Name
Pin No.
I/O
Description
DC
Characteristics
Comment
MIC_N
119
AI
Microphone analog input
(-)
MICBIAS
120
PO
Bias voltage output for
microphone
Vo = 2.2
–3.0 V
Vnom = 2.2 V
SPK_P
121
AO
Analog audio differential
output (+)
SPK_N
122
AO
Analog audio differential
output (-)
MIC_P
126
AI
Microphone analog input
(+)
GND Interfaces
Pin Name
Pin No.
GND
3, 31, 48, 50, 54, 55, 58, 59, 61, 62, 67, 68, 69, 70, 71, 72, 73, 74, 79, 80, 81, 82, 89,
90, 91, 100, 101, 102
