SIM800C datasheet(26/52 Pages) SIMCOM

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SIM800C_Hardware_Design_V1.02

2015-4-27

UA RT1_T X D

UA RT1_RX D

UA R T1_RT S

UA RT1_CT S

UA RT1_DT R

UA RT1_DCD

UA RT1_RI

TX D

RX D

RT S

CT S

DT R

DCD

RIN G

SerialP ort

Module(D C E )

C ustom er(D T E )

GN D

G N D

Figure 18: Connection of the serial interfaces

If the voltage of UART is 3.3V, the following reference circuits are recommended. If the voltage is 3.0V, please

change the resistors in the following figure from 5.6K to 14K.

5.6K

RX D

TX D

RT S

CT S

GP IO

EIN T

DT E

(3.3V )

5.6K

Module

UA RT 1_T X D

UA RT 1_RX D

UA RT1_RT S

UA RT1_CT S

UA RT 1_DT R

UA RT1_DCD

UA RT1_RI

GN D

Figure 19: Resistor matching circuit

If the voltage of UART is 3V or3.3V, the following reference circuits are recommended:

UA RT 1_T X D

RX D

M oduleD T E

TX D

UA R T 1_RX D

V D D _EXT

10K

GN D

Figure 20 : 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:

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