5V Multichannel RS232 Transceivers
It is an Integrated Circuit (IC) embedded in a single chip and act as a voltage level converter. MAX 232 is capable of converting 5V TTL Logic level to TIA/EIA-232-F level and can take up to +-30V input. It is normally used for the communication between microcontroller and Laptop/PC.
We can use MAX-232 to convert Transistor-Transistor Logic (TTL) voltage level to RS232 and vice versa. RS232 is the method of transferring data using serial communication. MAX 232 is a dual receiver or driver having capacitive voltage generator in order to supply RS232 voltage levels from a single supple of 5V. Each receiver converts RS232 inputs to 5V either Transistor-Transistor Logic (TTL) or Complementary Metal Oxide Semiconductor (CMOS) levels. Whereas each of the driver coverts TTL or CMOS levels to RS232 levels. RS232 receiver receives the input from the serial pins of the microcontroller.
The receiver also receives the input from RS232’s serial port and provides the output to the microcontroller’s receiver pin. Four external capacitors are needed for MAX-232 and their values are ranging from 1uF to 22uF. MAX 232 has a lot of applications including battery powered systems, terminals, modem, computer etc. Further detail about MAX-232 will be given later in this tutorial.
- Superior to Bipolar
- 120kbits/sec Data Rate
- Low Power Shutdown Current
- Designed for RS232 and V.28 Applications
- Three State TTL/CMOS Receiver Outputs
- Saves Board Space
- Integrated Charge Pump Circuitry
- Eliminates the Need for a Bipolar ±12V Supply
- Enables Single Supply Operation from +5V Supply
- Saves Power for Reduced Power Requirements
- 5µW Shutdown Mode
– Interface Translation
– Multidrop RS-232 Networks
– Portable Diagnostics Equipment
1 x 5V Multichannel RS232 Transceivers