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12/13/07 19:11
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 		 #148172 - I/O Electrical Specification
In my new 8051 based system i need to communicate with a device through only one line(TX_RX) of device.
in the device datasheet,the specification of TX_RX is as described below:
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 %.
No internal resistance between TX_RX and VCC shall be used.
The capacitance of TX_RX with respect to ground of each device should not exceed 250 pF.

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.

3-When the power supply of the device is switched on or off, the device shall not produce any
signals or other disturbances on the TX_RX.

Before it i never have any experience to designing a board with an I/O compatibility.
Now can you please help me on probably desired OpAmp,designing resistors and capacitors of it,and..

Thanks in Advanced.
Mehdi

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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