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Max 232 is a commuincations device used mainly for serial commands to and from a flash rom.
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Max232 interface with at89s52?
yes
In max232 what does max stands for?
maximum 232
What is 232 in RS232 and MAX232?
The difference between max232 and rs232 is the voltage levels of the rs232 are high. In order to reduce those voltage means to convert those voltage levels to TTL logic levels we use max232 integrated chip which is a dual driver/ receiver.
What does max mean in max232?
max means maxim which make ic's
What is the function of Max232?
The MAX232 is a dual driver/receiver that includes a capacitive voltage generator to supply TIA/EIA-232-F voltage levels from a single 5-V supply. Each receiver converts TIA/EIA-232-F inputs to 5-V TTL/CMOS levels. These receivers have a typical threshold of 1.3 V, a typical hysteresis of 0.5 V, and can accept ±30-V inputs. Each driver converts TTL/CMOS input levels into TIA/EIA-232-F levels. The driver, receiver, and voltage-generator functions are available as cells in the Texas Instruments LinASIC library.
Why do you connect capacitor in MAX232?
The input to the max232 ic will be of Transistor Transistor Logic (TTL) and its voltage range will be of 5 volt. The output of the max 232 ic will be of Recomended Standard 232 Logic (RS232 logic) and its voltage range will be of 12 volt. The max 232 ic which is operating on 5 volt supply has to step up the 5 volt input to 12 volt. Hence a capacitor is used for pumping the voltage and called as pumping capacitor.
If capacitors operate only when ac voltage is applied to circuit then why capacitors are used in dc voltage circuit?
The use of capacitors in DC circuitsIn practical applications DC voltage can hardly be obtained without the use of capacitor as a ripple filter in the first place. The rectifier create half or full wave, the capacitor smooth it into a constant DC before regulators regulate the voltage to precision.In DC circuits there are often sources of AC voltages and commonly they are unwelcome in the form of electronic noise. Let say you have devices drawing current from the supply, but as they draw more and less current often changing at high frequency and you need that same voltage as a reference or supply for a precision transducer, the use of a capacitor can help clear up the voltage.One has a dc signal sourced from a transducer and you need to filter the noise in its preamp. The use of a capacitor in the feedback circuit creates an integrator function that will assure a high gain factor on DC but low gain or attenuation of ac signals or in this case noise, to minimize signal drift. It can filter and purify such noisy signals.Capacitors can also be used as time delay functions, let say an amplifier have a mute function on a power amplifier IC. The function require a dc voltage to set it's state to "on" but you first want the amplifier to undergo all its surges and stabilizing, getting the internal clicks and pops over and done with before enabling the output of the amplifier. Then a resistor and capacitor is used to create a voltage ramp so that the voltage can slowly rise until it turns the outputs on quietly.Capacitors can be used across relay contacts to absorb back emf from inductive loads when relay switch off.Capacitors can be used to reduce noise on opamp supply rails. To reduce noise on digital IC's that my be sensitive to high frequency fluctuations in dc power especially analog to digital converters that does precision analog sampling and require precisions reverence voltages.Capacitors play an important function in switch mode regulators to convert pulse width modulated signals into regulated dc power rails. The capacitors may have low values, even in Class-D amplifiers using capacitors to convert pulse width modulated signals into DC if you would consider the instantaneous point on a sine wave output as a moment of DC.In split-rail power supplies, split-rail voltage converters use the charge-pump voltage doubler or Switched-Capacitor concept to convert one supply rail into two supply rails for example it converts +9V to a +9v and -9V rail. A common application is ICL7660 split-rail converter or the MAX232 level converter used for RS-232 serial communications. Its capacitors are used for DC supply but without them the chip will not work at all.The idea is to discharge one capacitor connected to the positive rail into the load while it charges the other one connected to the negative rail up. While the positive capacitor discharge the negative capacitor charges. They might switch places to charge and discharges 2000 times a second. The voltage across both capacitors are let say 8.8V at the time, because they were charged with 9V and one dropped to 8.8V and the other still 8.8V being charged to 9V. When we connect the capacitors in series they will have 17.6V across them. Or a +8.8V and -8.8V. This allows one to supply only +5Vdc to the MAX232 and it will produce data outputs levels of +8V to -8V.
