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SIM800H Datasheet(PDF) 31 Page - SIMCom

Part # SIM800H
Description  Hardware Design_V2.02
PDF  73 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  SIMCOM [SIMCom]
Direct Link  https://www.simcom.com
Logo SIMCOM - SIMCom

SIM800H Datasheet(HTML) 31 Page - SIMCom

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Smart Machine Smart Decision
1K
5.6K
RXD
TXD
RTS
CTS
GPIO
GPIO
EINT
DTE
(3.3V)
5.6K
5.6K
1K
1K
1K
1K
1K
1K
Module
TXD
RXD
RTS
CTS
DTR
DCD
RI
GND
GND
Figure 21: Resistor matching circuit
If the voltage of UART is 3V or3.3V, the following reference circuits are recommended:
Figure 22 : Diode isolation circuit
Note: please make sure the minimum of client high limit should be less than 2.8V minus the diode drop.
If the voltage of UART is 5V, the following reference circuits are recommended:
Figure 23: TX level matching circuit
SIM800H&SIM800L_Hardware Design_V2.02
31
2015-07-27



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