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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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SIM800L 데이터시트(PDF) 32 Page - SIMCom |
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SIM800L 데이터시트(HTML) 32 Page - SIMCom |
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32 / 73 page  Smart Machine Smart Decision 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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