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Original question:

WEBENCH® Tools/THVD8000EVM: THVD 8000

WEBENCH® Tools/THVD8000EVM: THVD 8000

divyanshu bawa
Expert 1325 points
Part Number: THVD8000EVM
Other Parts Discussed in Thread: THVD8000

Tool/software: WEBENCH® Design Tools

Dear Sir,

We were working on power line communication with thvd 8000 for our application. Thvd totally works on Rs485 interface with the mcu. But my question is while am using 2 evm of thvd i want to transmit data to another board over the power bus line.

vbb and gnd will be the input supply on the bus line and taking forwarded to other nodes.?

vcc and gnd are the input for thvd 8000 IC,But eventually we have to take power line bus connected with other nodes and transfer data that will be vbb and gnd.?

But eventually we have to take power line bus connected with other nodes and transfer data

Below link Page 6 (3.2 Operation Example)

Point 2

2. (Optional) Connect Vbb and GNB through Vbb and GNB connectors for power delivery. Short the shunt TL_A and TL_B to connect the inductor to bus. The maximum DC current rating of the populated inductor on the EVM is 1.9 A. The voltage rating of the populated capacitor is 100 V. On the transmitting board, Vbb and GNB connect to the power source, like a 12 V DC. On the receiving board, Vbb and GNB connect to the loading circuit (Figure 1). The received power may have a lower voltage level due to the cable loss.

am not getting the Jumper setting of inductor with the bus for evm.

  • 0
    Expert 1325 points

    Dear Sir,

    I want to communicate 2 EVM on power line communication.I will be transmitting signal from uart from EVM1 and receiving it on the other evm.

    So the jumper setting of both the EVM is as attached.F_Set is Third switch is on to make communication at 9600 baud rate.

    vcc and gnd for both board is given to 5v

    vbb and gnd for both the board is 12v

    source is same for both.

    Jumper J22 on board, A and B is interconnected with two wire.

    Is there anything else we need to change at the jumper setting.?

    am trying to transfer the bits and taking on a ttl converter.

  • 0 in reply to divyanshu bawa
    Expert 1325 points

    also my current architecture is

    Uart ----------EVM1----------EVM2--------TTL USB

    gnd is common

    EVM1 and EVM2 settings are given above.

    baud rate is 9600 also F_set is set as 10 times the baud rate

    Which 2 shorting jumper will make attached pic inductor and capacitor in dc power line

  • 0 in reply to divyanshu bawa
    TI__Mastermind 25705 points

    Hi,

    I think your setup is basically correct. The only thing I wanted to point out is that you only need to provide Vbb and GNB to one board. Then you can extract the power from other one. The power is delivered with the data by the two wires. If you trace the signal along the path, you will see the modulated signal on the bus is has a 12V DC offset, which is the superposed the DC power and modulated 9600 baud rate signal.

    Please let me know if you have any further questions.

    Regards,

    Hao  

  • 0 in reply to Hao L
    Expert 1325 points

    Dear Sir,

    As per attached picture Please suggest we need to fix shorting jumper for inductor and capacitor to put into a bus line.?

    Because signal travel without putting the shorting jumper also how they are connected.?

    Also the legends are different in manual and the testing board which am using.?

    2. Do we have some suitable baud rate for about 60 meter of distance.Because noise coupling can be a issue at higher rate.

    3.Can vbb and gnd can go upto 48v of voltage.Because its showing 100v in datasheet.

  • 0 in reply to divyanshu bawa
    TI__Mastermind 25705 points

    1. To shunt TL_A and TL_B to attach the inductor to the bus. The cap C12/C13 has been populated on the board.

    2. You may choose the highest frequency with 60m cable. Some lab data can be found in this design guide.

    3. Yes, 48V should work too.

    Regards,

    Hao

  • 0 in reply to Hao L
    Expert 1325 points

    Dear Sir,

    Thanks for your valuable feedback

    1.If the 2 wire bus is ideal will it be any noise in the bus line.?

    2.Can i Get Bom for the EVM.? Because i want to know about the tolerance of capacitor with their respective package other components also,Moreover.in inductor we dont need 1.9 amp for our node to work at such high power so we will select inductor and capacitor ratings according to our application.

    3.in Design guide point 9 Grounding and common mode Noise. Do we need to provide the Figure 16 split termination on each and every node for termination.? for better results.? or last node having this node will work.

  • 0 in reply to divyanshu bawa
    Prodigy 50 points

    Dear Sir,

    Greetings

    Sir,As per my application Am having some queries related to EVM board which are as below.

    1.If the 2 wire bus is ideal will it be any noise in the bus line.?

    2.in Design guide point 9 Grounding and common mode Noise. Do we need to provide the Figure 16 split termination on each and every node for termination.? for better results.? or last node having this node will work.

    3.If both line A and Line B get short circuit will the IC THVD 8000 shutdown automatically or we need to provide the extra protection.

    4. R-6 and R-22 in attached. is it necessary to put this resistor.Because mode pin will be mcu controllable.? Can we neglect this resistor in our design.

    5.R 8,R 9,R 10,R 11 Resistor pic attached below, In EVM they are not connected why this resistor are placed on Line A and Line B. Can we neglect them.?.

  • 0 in reply to Divyanshu Bawa
    TI__Mastermind 25705 points

    Hi,

    1. It's possible that noise is coupled to the wires in real applications. The differential signaling has good immunity over the common mode noise.

    2. Like RS-485, the termination is suggested to add at the farthest two ends of the bus. If you so, you have choice to make the two places split termination.

    3. The device has the internal thermal shutdown feature, which could be triggered if the short condition makes the chip heated up.

    4. The 50Ohm resistors are used to match the signal generator's impedance in testing. You can ignore them if the pins are connected to MCU.

    5. R8, R9, R10, R11 are for pull up/down option for the bus for experimental purpose.

    Regards,

    Hao

  • 0 in reply to Hao L
    Prodigy 50 points

    Dear Sir,

    Hope you are doing well,

    sir i have some queries related to the signal transmission or what actually thvd 8000 does with the data transmitted .

    When we transmit data on thvd 8000 at some baud which is around 9600 the output wave of differential data on And B comes up with a frequency of selected on fset. i.e 1 Mh.

    what actually THVD 8000 does so that it can transpose the power and data on a same line and become readable for the next node.? 

    This question will also comes up with the point why 10 time frequency is required to transfer data.

  • 0 in reply to Divyanshu Bawa
    TI__Mastermind 25705 points

    Hi,

    The OOK modulation is used to transmit the data, which is separable from the power signal in frequency domain. However to distinguish the modulated signal from some random noise, the device needs several repeated bit patterns (called 'clocks' in the datasheet) to trigger the receiver. You can find the related information in section 9.2.1.1 in the datasheet.

    Regards,

    Hao 

  • 0 in reply to Hao L
    Expert 1325 points

    Dear Sir,

    We have completed the testing of 2 EVM Board of THVD 8000 and its working fine as per our application.I have some query while testing the THVD in real application.

     The actual process will be like. Data will flow through Ethernet to Uart then to the first node (THVD 8000) on DC bus.Only 2 wires will be coming out from the converter or gateway

    For this converter we need To put thvd8000 IC on the master side so that uart single will be converter to THVD8000 signal with Signal A and Signal B superimpose on DC power.Which included the components which are marked below in the pic. (Like 

  • 0 in reply to Hao L
    Expert 1325 points

    Dear Sir,

    We have completed the testing of 2 EVM Board of THVD 8000 and its working fine as per our application.I have some query while testing the THVD in real application.

     The actual process will be like. Data will flow through Ethernet to Uart then to the first node (THVD 8000) on DC bus.Only 2 wires will be coming out from the converter or gateway

    For this converter we need To put thvd8000 IC on the master side so that uart single will be converter to THVD8000 signal with Signal A and Signal B superimpose on DC power.Which included the components which are marked below in the pic. (Like 

  • 0 in reply to Hao L
    Expert 1325 points

    Dear Sir,

    We have completed the testing of 2 EVM Board of THVD 8000 and its working fine as per our application.I have some query while testing the THVD in real application.

     The actual process will be like. Data will flow through Ethernet to Uart then to the first node (THVD 8000) on DC bus.Only 2 wires will be coming out from the converter or gateway

    For this converter we need To put thvd8000 IC on the master side so that uart single will be converter to THVD8000 signal with Signal A and Signal B superimpose on DC power.Which included the components which are marked below in the pic. (Like 

  • 0 in reply to Hao L
    Expert 1325 points

    Dear Sir,

    We have completed the testing of 2 EVM Board of THVD 8000 and its working fine as per our application.I have some query while testing the THVD in real application.

     The actual process will be like. Data will flow through Ethernet to Uart then to the first node (THVD 8000) on DC bus.Only 2 wires will be coming out from the converter or gateway

    For this converter we need To put thvd8000 IC on the master side so that uart single will be converter to THVD8000 signal with Signal A and Signal B superimpose on DC power.Which included the components which are marked below in the pic. (Like 

  • 0 in reply to Hao L
    Expert 1325 points

    Dear Sir,

    We have completed the testing of 2 EVM Board of THVD 8000 and its working fine as per our application.I have some query while testing the THVD in real application.

     The actual process will be like. Data will flow through Ethernet to Uart then to the first node (THVD 8000) on DC bus.Only 2 wires will be coming out from the converter or gateway

    For this converter we need To put thvd8000 IC on the master side so that uart single will be converter to THVD8000 signal with Signal A and Signal B superimpose on DC power.Which included the components which are marked below in the pic. (Like 

  • 0 in reply to divyanshu bawa
    TI__Mastermind 25705 points

    Hi,

    It looks like your post has been cut off. I will make the comments in your other post.

    Regards,

    Hao