Shanghai SIMCom Wireless Solutions Limited SIM7000A ユーザーズマニュアル
Smart Machine Smart Decision
SIM7000 _Hardware Design _V1.00
2017-05-23
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
to reset module
50
100
500
ms
V
IH
Input high level voltage
1.2
1.8
2.1
V
V
IL
Input low level voltage
-0.3
0
0.8
V
3.3 UART Interface
SIM7000 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.
Moreover, if users need to use two UART simultaneously, SIM7000 also provides a 2-wire UART
interface multiplex from GPIO. The GPIO0 multiplex as TXD of the 2-wire UART, and the GPIO1
multiplex as RXD of the 2-wire UART. Standard version cannot support this function
(Data Communication Equipment). AT commands and data transmission can be performed through
UART interface.
Moreover, if users need to use two UART simultaneously, SIM7000 also provides a 2-wire UART
interface multiplex from GPIO. The GPIO0 multiplex as TXD of the 2-wire UART, and the GPIO1
multiplex as RXD of the 2-wire UART. Standard version cannot support this function
3.3.1
UART Design Guide
The following figures show the reference design.
Figure 13: UART full modem
Figure 14: UART null modem