Product Info

Automotive Module Series
AG35 Hardware Design
AG35_Hardware_Design 54 / 129
UART2_RTS
166
DI
Request to send
1.8V power domain
Table 14: Pin Definition of Debug UART Interface
Pin Name
Pin No.
I/O
Description
Comment
DBG_TXD
71
DO
Transmit data
1.8V power domain
DBG_RXD
72
DI
Receive data
1.8V power domain
The logic levels are described in the following table.
Table 15: Logic Levels of Digital I/O
Parameter
Min.
Max.
Unit
V
IL
-0.3
0.6
V
V
IH
1.2
2.0
V
V
OL
0
0.45
V
V
OH
1.35
1.8
V
The module provides 1.8V UART interfaces. A level translator should be used if customers’ application is
equipped with a 3.3V UART interface. A level translator TXS0108E-Q1 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_1V8
RI
DCD
RTS
RXD
DTR
CTS
TXD
51K
51K
0.1uF
0.1uF
RI_MCU
DCD_MCU
RTS_MCU
RXD_MCU
DTR_MCU
CTS_MCU
TXD_MCU
VDD_MCU
Translator
Figure 23: Reference Circuit with Translator Chip