User's Manual

Smart Machine Smart Decision
Th
e SIM7600E-H UART is 1.8V voltage interface. If user’s UART application circuit is 3.3V
voltage interface, the level shifter circuits should be used for voltage matching. The
TXB0108RGYR provided by Texas Instruments is recommended.
SIM7600E-H_UserManual_V1.00 2017-10-11
Table 10: RESET pin electronic characteristic
Symbol
Description
Min.
Typ.
Max.
Unit
T
reset
The active low level time impulse on RESET pin to
reset module
50 100 500 ms
V
IH
Input high level voltage 1.17 1.8 2.1 V
V
IL
Input low level voltage
-0.3
0
0.8
V
3.3 UART Interface
SIM7600E-H provides a 7-wire UART (universal asynchronous serial transmission) interface as
DCE (Data Communication Equipment). AT commands and data transmission can be performed
through UART interface.
3.3.1 UART Design Guide
The following figures show the reference design.
TXD
RXD
RTS
CTS
DTR
DCD
RI
TXD
RXD
RTS
CTS
DTR
DCD
RING
MODULE
( DCE)
HOST
(DTE)
UART
UART
Figure 13: UART full modem
MODULE
( DCE)
HOST
(DTE)
UARTUART
TXD
RXD
RTS
CTS
DTR
DCD
RI
TXD
RXD
RTS
CTS
DTR
DCD
RING
Interrupt
Wake up host
Figure 14: UART null modem