Note: Some variants use 20-pin SSOP/TSSOP with enable lines and additional charge pump caps. +3.3V ---- VCC | +-- C1 --+--- V+ | | | C2 C3 | | | | +--------+-----+ | GND MCU_TX1 ---- TTL_IN1 ---> RS232_OUT1 ---- DB9 Pin 2 MCU_TX2 ---- TTL_IN2 ---> RS232_OUT2 ---- DB9 Pin 3 ...
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