Quectel EG915U-EU - Control and Indication Signals

LTE Standard Module Series
EG915U-EU_Hardware_Design 50 / 81
4.8. SPI Interface
The SPI interface of the EG915U-EU module only supports the master mode. It communicates with
peripherals in a synchronous duplex serial manner. It has a working voltage of 1.8 V and a maximum
clock frequency of 25 MHz.
Table 19: Pin Definition of SPI Interface
4.9. Control Signal
Relative interfaces’ pin descriptions are here as follows:
Table 20: Pin Definition of Control Signal
Pin Name
Pin No.
I/O
Description
Comment
SPI_CLK
26
DO
SPI clock
Just master mode
only.
SPI_CS
25
DO
SPI chip select
SPI_DIN
88
DI
SPI master mode input
SPI_DOUT
64
DO
SPI master mode output
When the universal 4-wire SPI interface is used to connect Nor Flash, it supports Flash basic reading,
writing, erasing etc. It needs to perform erasing and writing balanced protection by itself. It does not
support the file system and can only be stored.
Pin Name
Pin No.
I/O
Description
Comment
W_DISABLE#
18
DI
Airplane mode control
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.
NOTE