Quectel EG915U-EU Manual page 25

Pin Name Pin No.
USB_BOOT 75
W_DISABLE# 18
AP_READY 19
Analog Audio Interfaces
Pin Name Pin No.
MIC_N 119
MICBIAS 120
SPK_P 121
SPK_N 122
MIC_P 126
GND Interfaces
Pin Name Pin No.
3, 31, 48, 50, 54, 55, 58, 59, 61, 62, 67, 68, 69, 70, 71, 72, 73, 74, 79, 80, 81, 82, 89,
GND
90, 91, 100, 101, 102
EG915U-EU_Hardware_Design
I/O Description
Force the module into
DI emergency download
mode
DI Airplane mode control
Application processor
DI
ready
I/O Description
Microphone analog input
AI
(-)
Bias voltage output for
PO
microphone
Analog audio differential
AO
output (+)
Analog audio differential
AO
output (-)
Microphone analog input
AI
(+)
LTE Standard Module Series
DC
Comment
Characteristics
1.8 V power
domain. Active
high.
V min = -0.3 V
IL
A circuit that
V max = 0.6 V
IL
enables the
V min = 1.2 V
IH
module to enter
V max = 2.0 V
IH
the download
mode must be
reserved.
1.8 V power
domain. Pulled
up by default.
V min = -0.3 V
IL
When it is in low
V max = 0.6 V
IL
voltage level, the
V min = 1.26 V
IH
module can
V max = 2.0 V
IH
enter airplane
mode. If unused,
keep it open.
V min = -0.3 V 1.8 V power
IL
V max = 0.6 V domain.
IL
V min = 1.26 V If unused, keep it
IH
V max = 2.0 V open
IH
DC
Comment
Characteristics
Vo = 2.2–3.0 V
Vnom = 2.2 V
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