LTE-A Module Series
EG18 Hardware Design
EG18_Hardware_Design 52 / 104
A level translator TXS0108EPWR provided by Texas Instruments is recommended. The following figure
shows a reference design.
VCCA
VCCB
OE
A1
A2
A3
A4
A5
A6
A7
A8
GND
B1
B2
B3
B4
B5
B6
B7
B8
VDD_EXT
RI
DCD
RTS
RXD
DTR
CTS
TXD
51K
51K
0.1
μ
F
0.1
μ
F
RI_MCU
DCD_MCU
RTS_MCU
TXD_MCU
DTR_MCU
CTS_MCU
RXD_MCU
VDD_MCU
Translator
VDD_EXT
10K
120K
Figure 24: Level Translation Reference Circuit with an IC
Please visit http://www.ti.com for more information.
V
IH
1.2
2.0
V
V
OL
0
0.45
V
V
OH
1.35
1.8
V