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Zakładka z wyszukiwarką danych komponentów |
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Zakładka z wyszukiwarką danych komponentów |
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SIM800H Arkusz danych(PDF) 44 Page - SIMCom |
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SIM800H Arkusz danych(HTML) 44 Page - SIMCom |
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44 / 73 page  Smart Machine Smart Decision If power supply is 2.8V for SD card, customer can use VDD_EXT; if power supply is 3.3V, please use external design LDO. 4.10. Keypad Interface The keypad interface consists of 5 keypad column outputs and 5 keypad row inputs, with total 5*5*2, which is 50 keys. Module keys have two connections: connections 1, which can support 25 keys; connections 2, which can support 50 keys. Connections 1: Figure 40: 25 keys reference circuit Note：According to the traditional 5*5 to design buttons, when there is spare KBC or KBR, customer can execute AT command to define as GPIO for details please see the relevant manuals. Connections 2: Module supports a new key connection, can support 50 keys, which meets full keyboard demand, the connection diagram is as following: SIM800H&SIM800L_Hardware Design_V2.02 44 2015-07-27 |
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