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???
12/14/07 14:16
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 		 #148213 - more clarification needed
Responding to: ???'s previous message
Mehdi said:

1-In "Power Off" state, in the receiving state and at logic "1" in the transmitting state, TX_RX of the device shall behave like a resistance to ground of 120 kohms ± 5 %.

U3A does not answer to this. You need open drain transistor with
reistor 120k between drain and ground.

About receiving -
You wrote

one wire communication,with 0-12 volt voltage level.
, but

2-At logic "0", in the transmitting state, the device shall have an equivalent sink resistance of not more than 110 ohm between TX_RX and ground.

So what is true - Your side must transmit only by pulling low
data line and other side can transmit with high and low levels?

It will be simple to help if You specify what device will be connected.
CPLD/FPGA maybe is not needed .
regards

List of 56 messages in thread
TopicAuthorDate
I/O Electrical Specification            01/01/70 00:00      
   have a look at J1708            01/01/70 00:00      
      J1708 INTERFACE CIRCUIT            01/01/70 00:00      
         naah            01/01/70 00:00      
   an I/O compatibility.            01/01/70 00:00      
      an I/O compatibility            01/01/70 00:00      
   fet+resistor for TX, resistor + comparator RX            01/01/70 00:00      
      more clarification!            01/01/70 00:00      
         What is the effective communication distance            01/01/70 00:00      
            about 1 meter!            01/01/70 00:00      
               NO, that would be wrong if multimaster            01/01/70 00:00      
                  master and slave            01/01/70 00:00      
                  But we already know what we are Transmitting            01/01/70 00:00      
         more clarification needed            01/01/70 00:00      
            more clarification needed            01/01/70 00:00      
      J1708 Problems            01/01/70 00:00      
         Confusing A-line and B-line in a plug?            01/01/70 00:00      
         90% of J1708 devices            01/01/70 00:00      
   Please tell us which chip you use!            01/01/70 00:00      
      i must simulate ECU behavior,not a single chip            01/01/70 00:00      
         what is the bit rate and will this do            01/01/70 00:00      
            5 bps!            01/01/70 00:00      
               it will make the output 110 ohms            01/01/70 00:00      
                  a positive to you erik.            01/01/70 00:00      
                  DG211?            01/01/70 00:00      
                     you need an analog switch            01/01/70 00:00      
                        4066 /DG211?            01/01/70 00:00      
                           Use an analog Multiplexer instead eg ADG509A            01/01/70 00:00      
   Final Scheme,Any Advice?            01/01/70 00:00      
      some            01/01/70 00:00      
         A positive to you Stefan,            01/01/70 00:00      
         IRF7303            01/01/70 00:00      
         SW1            01/01/70 00:00      
      Link and circuit...            01/01/70 00:00      
         3 Positive to you Kai,            01/01/70 00:00      
         what happens on RX when in+>in-            01/01/70 00:00      
            LM393 is comparator with open collector output            01/01/70 00:00      
               Ok,            01/01/70 00:00      
         some question!            01/01/70 00:00      
            Answers            01/01/70 00:00      
               Tahnks Kai for you valuable time,            01/01/70 00:00      
         thanks again but            01/01/70 00:00      
            No, isnt needed            01/01/70 00:00      
               Thanks            01/01/70 00:00      
               Thanks            01/01/70 00:00      
         Link and circuit...            01/01/70 00:00      
             Link and circuit            01/01/70 00:00      
            Please read "Functional Description" of datasheet            01/01/70 00:00      
               Mehdi why you want to invent the wheel??            01/01/70 00:00      
                  Mehdi why you want to invent the wheel??            01/01/70 00:00      
   no offense, but I think you are off the rocker            01/01/70 00:00      
      lower depth of knoledghe            01/01/70 00:00      
      Its known as progressive evolution            01/01/70 00:00      
      So, you blindly guessed...            01/01/70 00:00      
         what is an ECU?            01/01/70 00:00      
            Engine Control Unit            01/01/70 00:00      

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