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handsprince
Joined: 07 Feb 2006
Posts: 45
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 29 Feb 2008 14:46 function of max232 |
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| What is the function of MAX232? i know it will convert a input serial signal to manchester coding.
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29 Feb 2008 14:46 Ads |
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rajeshkumar123
Joined: 27 Dec 2007
Posts: 179
Helped: 19
Location: Chennai-India
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29 Feb 2008 15:20 max232 function |
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hi,
Max 232 is a TTL to RS232 level converter. Where does manchester come in here?
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handsprince
Joined: 07 Feb 2006
Posts: 45
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29 Feb 2008 16:21 max232 cmos |
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| So, what actually MAX232 does?
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Medtronic
Joined: 19 May 2005
Posts: 165
Helped: 11
Location: Egypt
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29 Feb 2008 17:13 function of max232 ic |
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Hi
with Serial communicatio interface between micro and pc we must put max232 to convert signal from ttl level (micro) to rs232 level (pc)
this is the function of max232 level converter
Regards
MedTronic
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AdvaRes
Joined: 14 Feb 2008
Posts: 1038
Helped: 46
Location: At home
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29 Feb 2008 17:22 function max232 |
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| rajeshkumar123 wrote: |
hi,
Max 232 is a TTL to RS232 level converter. Where does manchester come in here? |
RS232 signal are +/- 12 V. Max232 convert them to TLL levels 0V 5V. In ensure the interfacing between the Serial port of the PC and a TTL logic devices (µc....=)
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johnyaya
Joined: 30 May 2001
Posts: 148
Helped: 17
Location: YoyoDyne
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29 Feb 2008 17:57 funtion of max232 |
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| The MAX232 series of ICs will convert the TTL level signals (0V = space, 5V = mark) to RS232 levels (+5V to +15V = space, -5V to -15V = mark). You may notice that the RS232 driver is an inverter, so the receiver must also be an inverter.
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dmk
Joined: 14 Nov 2005
Posts: 194
Helped: 37
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29 Feb 2008 18:02 microcontroller max232 |
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EIA/TIA- 232E and V.28 specification define the logic 0 is +5 up to 15V, and logic 1 is -5 up to -15V.
So, if applied to TTL (or came from) the logic level must be translated from 0.8V (TTL logic 0) to at least +5V (RS232 zero level) and 2.4V (TTL logic 1) to at least -5V (RS232 one's level).
The typical MAX 232 driver output voltage swing is ±8V and is guaranteed to meet these specifications(i.e ±5V minimum driver output levels under worst-case conditions). Input thresholds are both TTL and CMOS compatible.
In the opposite case, MAX 232 receiver translates voltage levels from +5V or higher (the RS 232 level for logic 0) to 0.8V or lower, and from -5V or lower to 2.4V or higher.
The MAX220–MAX249 family (line drivers/receivers)is intended for communications
interfaces, particularly applications where ±12V is
not available - especially in battery-powered systems. In addition, the MAX225,
MAX233, MAX235, and MAX245/MAX246/MAX247 use no external components.
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big porkus
Joined: 19 Oct 2004
Posts: 23
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29 Feb 2008 18:58 max 232 function |
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It is the link of the MAX232 datasheet
I hope that this helps in better understanding of how IC function.
h**p://datasheets.maxim-ic.com/en/ds/MAX220-MAX249.pdf
Bye
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drbizzarow
Joined: 24 May 2006
Posts: 276
Helped: 9
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29 Feb 2008 23:08 maxim 232 of function |
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it is ttl to rs232 level covertor ic.. (google rs232 tutorial)
and dl max232 datasheet
simple !!
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fletcher
Joined: 06 Nov 2004
Posts: 55
Helped: 1
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05 Mar 2008 16:54 maxim 232 purpose |
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It is a TTL-to-RS232 converter.
This convertion is needed when you are communication from a distance (about a few meters). TTL works fine but for this distance its sensitive to noise, so in many cases specially in noisy environment they use RS232 standard. Because many IC and circuits work with TTL levels you have to convert TTL-to-RS232 and vice versa.
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H_D_R
Joined: 31 Jan 2008
Posts: 351
Helped: 18
Location: India
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06 Mar 2008 4:17 tutorial ic max232 |
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| handsprince wrote: |
| What is the function of MAX232? |
MAX232 is the voltage level converter.
it converts voltage level from CMOS (microcontroller output is CMOS) to TTL(PC output is TTL) and vice versa.
but it drives voltage level from one to another voltage thats why it is also called voltage driver IC.
if you will check the voltage level for logic 1 and logic 0 in CMOS and TTL both logic then you will understand what this IC is doing...??
| Quote: |
| i know it will convert a input serial signal to manchester coding. |
BTW, i dont know about that...
still if you have any question feel free to post.. 
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