Operating Modes - Quectel EG91 Series Hardware Design
Lte standard module
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Also See for EG91 Series:
- Hardware design (98 pages) ,
- Hardware design (94 pages) ,
- Hardware design (109 pages)
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Other Pins
Pin
Pin Name
No.
W_DISABLE#
18
AP_READY
19
USB_BOOT
75
NC and RESERVED Pins
Pin
Pin Name
No.
NC
1, 2, 11–14, 16, 51, 57, 63–66, 76–78, 88, 92–99
RESERVED
25, 56
NOTE
1. Keep all RESERVED pins and unused pins unconnected.
2. BOOT_CONFIG pins (SPI_CLK, USB_BOOT, PCM_CLK, PCM_SYNC) cannot be pulled up before
startup.
3.4. Operating Modes
The table below briefly outlines the operating modes to be mentioned in the following chapters.
EG91_Series_Hardware_Design
I/O
Description
Airplane mode
DI
control
Application
DI
processor ready
Force the module to
DI
enter emergency
download mode
I/O
Description
LTE Standard Module Series
DC
Comment
Characteristics
1.8 V power domain.
V
min = -0.3 V
Pull-up by default.
IL
V
max = 0.6 V
At low voltage level,
IL
V
min = 1.2 V
module can enter
IH
V
max = 2.0 V
airplane mode.
IH
If unused, keep it open.
V
min = -0.3 V
IL
V
max = 0.6 V
1.8 V power domain.
IL
V
min = 1.2 V
If unused, keep it open.
IH
V
max = 2.0 V
IH
V
min = -0.3 V
IL
1.8 V power domain.
V
max = 0.6 V
IL
It is recommended to
V
min = 1.2 V
IH
reserve the test points.
V
max = 2.0 V
IH
DC
Comment
Characteristics
Keep these pins
unconnected.
Keep these pins
unconnected.
Pin 56 is only reserved
on EG91-E.
31 / 105
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