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SIM800L Folha de dados(PDF) 32 Page - SIMCom

Nome de Peças SIM800L
Descrição Electrónicos  Hardware Design_V2.02
PDF  73 Pages
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Fabricante Electrônico  SIMCOM [SIMCom]
Página de início  https://www.simcom.com
Logo SIMCOM - SIMCom

SIM800L Folha de dados(HTML) 32 Page - SIMCom

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Figure 24: RX level matching circuit
Note: When Figure22, Figure 23 and Figure 24 are used for electrical level isolation, if customers use serial port to upgrade SW,
please note VDD_EXT has no voltage output during the upgrading process, LDO output could be used as VDD_EXT in the
figure, upgrading through USB port is recommended.
4.5.3
Debug Interface
SIM800H&SIM800L could achieve software debug function through USB interface. When powering on the
module, connect 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:
Figure 25: 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 11: VBUS operation voltage
Pin
Min
Typ
Max
Unit
VBUS
4.3
5.0
7.0
V
SIM800H&SIM800L_Hardware Design_V2.02
32
2015-07-27



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