Quectel LTE-A Series Hardware Design page 53

V
IH
V
OL
V
OH
A level translator TXS0108EPWR provided by Texas Instruments is recommended. The following figure
shows a reference design.
VDD_EXT
0.1μF
VDD_EXT
RI
DCD
CTS
RTS
DTR
TXD
RXD
Figure 24: Level Translation Reference Circuit with an IC
Please visit http://www.ti.com for more information.
EG18_Hardware_Design
1.2
0
1.35
VCCA
10K
OE
120K
A1
A2
Translator
A3
A4
A5
A6
A7
51K
A8
EG18 Hardware Design
2.0
0.45
1.8
VCCB
0.1μF
GND
B1
B2
B3
B4
B5
B6
B7
51K
B8
LTE-A Module Series
V
V
V
VDD_MCU
RI_MCU
DCD_MCU
CTS_MCU
RTS_MCU
DTR_MCU
RXD_MCU
TXD_MCU
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