MAX 232

MAX 232

           The MAX 232 contain four sections: dual charge- pump DC-DC voltage converters,     RS-232 drivers, RS-232 receivers, and receiver and transmitter enable control inputs.

MAX 232
          The MAX232 from Maxim was the first IC which in one package contains the necessary drivers (two) and receivers (also two), to adapt the RS-232 signal voltage levels to TTL logic. It became popular, because it just needs one voltage (+5V) and generates the necessary RS-232 voltage levels (approx. -10V and +10V) internally. This greatly simplified the design of circuitry. Circuitry designers no longer need to design and build a power supply with three voltages (e.g. -12V, +5V, and +12V), but could just provide one +5V power supply, e.g. with the help of a simple 78x05 voltage converter. The MAX232 has a successor, the MAX232A. The ICs are almost identical, however, the MAX232A is much more often used (and easier to get) than the original MAX232, and the MAX232A only needs external capacitors 1/10th the capacity of what the original MAX232 needs.
            It should be noted that the MAX232 is just a driver/receiver. It does not generate the necessary RS-232 sequence of marks and spaces with the right timing, it does not decode the RS-232 signal, and it does not provide a serial/parallel conversion. All it does is to convert signal voltage levels. Generating serial data with the right timing and decoding serial data has to be done by additional circuitry, e.g. by a 16550 UART or one of these small micro controllers (e.g. Atmel AVR, Microchip PIC) getting more and more popular.

1.      Portable computers
2.      Low power Modems
3.      Interface translation
4.      Battery powered RS-232 systems


The MAX-232 provides an interface between the ZigBee module and microcontroller. It converts all the information’s provided by the ZigBee module of microcontroller standards and thus provides a well interface between ZigBee and the microcontroller

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