User Manual

Smart Machine Smart Decision
SIM7100_Hardware_Design_V1.02 2015-06-16
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 0.3 V
3.3 UART Interface
SIM7100 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.
Figure 15: UART Full modem
Figure 16: UART Null Modem
The SIM7100 UART is 1.8V voltage interface. If user’s UART application circuit is 3.3V voltage