LTE Module Series
LTE OPEN EVB User Guide
LTE_OPEN_EVB_User_Guide 38 / 62
Table 16: eMMC Function GPIO Configuration
4.8. UART Interfaces (J0501/J0502/J0503)
LTE OPEN EVB offers three UART interfaces: COM (DEBUG) J0501, COM3 (MAIN) J0502 and COM
(UART1) J0503.
J0501 can be used for Linux console and log output.
J0502 is intended for the communication between the module and the host application. It can be
used for data transmission and AT command communication.
J0503 is intended for the communication between the module and the host application. It can be
used for data transmission.
The following figure shows the block diagram of J0501/J0502/J0503 on LTE OPEN EVB.
J0101
LTE-
QuecOpen
Module
RS-232
Level Match
3.0V/1.8V
Level Translator
COM (DEBUG)
DB9
J0501
RS-232
3.0V
1.8V
U0504
U0502
RS-232
Level Match
3.0V/1.8V
Transistor Level
Translator
COM (UART1)
DB9
J0503
RS-232
3.0V
U0502
1.8V
U0504
RS-232
Level Match
3.0V/1.8V
Transistor Level
Translator
COM (MAIN)
DB9
J0502
RS-232
3.0V
U0501
U0503
1.8V
Figure 31: UART Block Diagram
Pin No.
Pin Name
Operation
Pin No.
Pin Name
Pin 39 (J0201)
EMMC_RSTN
Shorted to
Pin 38 (J0201)
GPIO_26