Specifications

L506 Hardware Design

Note

：

UART_RI,UART_DTR can be used as two line UART interface for system debugging, See

table 3-3 Pin functional description.

3.8.2 UART interface application

UART_RI, UART_DTR default status is the system log port, so we recommend that users keep

reserved the interface and test points in design. The L506 UART is 1.8V interface. A level shifter

should be used if user’s application is equipped with a 3.3V UART interface. The level shifter

TXB0108RGYR provided by Texas Instruments is recommended. The reference design of the

TXB0108RGYR is in the following figures. About the application as below:

TXD1

RXD1

RTS1

CTS1

DTR1

DCD1

RING1

TXD

RXD

RTS

CTS

DTR

DCD

RING

Serial Port

L506 DCE

Client(DET)

GND GND

Figure 3-12UART 4 Line connection mode