SIM800C datasheet(27/52 Pages) SIMCOM

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SIM800C_Hardware_Design_V1.02

2015-4-27

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UA RT 1_T X D

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RX D

VD D

DT E

Figure 21: TX level matching circuit

VD D _EX T

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DT E

UA RT 1_R X D

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Figure 22: RX level matching circuit

4.5.3

Debug Interface

SIM800C could achieve software debug function through USB interface. When powering on the module,

connect USB_VBUS, USB_DP, USB_DN, and GND to PC, then install the driver following the prompts, a

UART port could be recognized by PC, customer could achieve the software Debug with this UART port.

SIMCom recommended the following connected diagram:

MO D U LE

US B

US B _D P

US B _ DN

US B _ D N

GN D

22R

US B _ D P

U S B _VBU S

VBU S

22 R

1uF

Figure 23: USB reference circuit

The TVS on USB data line should be less than 5pF, and traced by differential forms.

Note: please reserve the USB interface or test point for the further debugging

Table 10: USB_VBUS operation voltage

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