LTE-A Module Series
EG060V-EA Hardware Design
EG060V-EA_Hardware_Design 55 / 82
The voltage range of the SPI interface is 1.8 V. Therefore, A level translator between module and host
should be used if the application is equipped with a 3.3 V processor or device interface.
Below is a reference design of SPI Interface with a Level Translator.
VCCA
VCCB
OE
A1
A2
A3
A4
NC
GND
B1
B2
B3
B4
NC
VDD_EXT
SPI_CS
SPI_CLK
SPI_MISO
SPI_MOSI
0.1
μF
0.1
μF
SPI_CS_N_MCU
SPI_CLK_MCU
SPI_MISO_MCU
SPI_MOSI_MCU
VDD_MCU
Translator
Figure 29: Reference Design of SPI Interface with Level Translator
3.21. USB_BOOT Interface
EG060V-EA provides a USB_BOOT interface. Developers can pull up USB_BOOT to VDD_EXT before
powering on the module, thus the module will enter into emergency download mode when powered on. In
this mode, the module supports firmware upgrade over USB interface.
Table 26: Pin Definition of USB_BOOT Interface
t(cl)
SPI clock low level time
9.0
-
-
ns
t(mov)
SPI master data output valid time
-5.0
-
5.0
ns
t(mis)
SPI master data input setup time
5.0
-
-
ns
t(mih)
SPI master data input hold time
1.0
-
-
ns
Pin Name
Pin No.
I/O
Description
Comment
USB_BOOT
140
DI
Force the module into emergency
download mode
1.8 V power domain.
Active high.
If unused, keep it open.