Sunsea AIoT SimCom SIM7090G User Manual page 30

3.3.1. UART Design Guide
The following figures show the reference design.
Driving the host DTR to low level will wake up the module.

AP_READY will detect the sleep state of the host (can be configured to high level or low level

detection).
Table 13: UART electronic characteristic
Symbol Description
V UART input high level voltage
IH
V UART input low level voltage
IL
V UART output high level voltage
OH
V UART output low level voltage
OL
The SIM7090G 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 following figure shows the voltage
matching reference design.
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Figure 10: UART full modem
SIM7090G User Manual V1.01
Min. Typ. Max. Unit
1.17 1.8 2.1
-0.3 0 0.63
1.35 1.8 1.8
0 0 0.45
V
V
V
V
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