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MAX3243E: TI/MAX3243EIPWR Power Consumption question

Marx Pan
Intellectual 315 points
Part Number: MAX3243E

Hi, TI member,

We use TI RS232 transceiver  solution TI/MAX3243EIPWR and we measure power consumption of each state.

There is no RS232 device connected.

(1)Short Idle:110.5mW

(2)Modern Standby:114.016mW

Please refer below TI/MAX3243EIPWR, there is a great deal of difference between Auto-powerdown disabled(No load) and our measurement.

Does it need to to any setting form EC?

Below is our block diagram.

Thank you.

Thank you.

  • 0
    TI__Genius 15345 points

    Hello,

    Can you give any information on the test set up you used, what devices were connected, what probes were used, what connections were made on the pins etc.? I know you said there was no RS232 device connected but was there anything else connected to the power rail?

    In the meantime I will check what test set up was used to achieve our results.

    Best,

    Chris

  • 0 in reply to Chris Ayoub
    Intellectual 315 points

    Hi, Chris,

    1.It doesn't connect test RS232 device.

    2.There is no other device to share with the power rail.

    3.How to measurement:Please refer below schematic, we cascade a current meter to below yellow power path.

    Thank you.

  • 0 in reply to Marx Pan
    TI__Genius 15345 points

    For the TI test case it was measured with the device not driving any load.

    Vcc=3.3V or 5V. Forceoff_bar=Forceon=VCC. Then Dout and RIN should float with nothing attached. Then you should pull Din to VCC or GND.

    I can't look at your schematic because it's blurry. Would you be able to upload a higher resolution image or pdf of your schematic?

    Best,

    Chris

  • 0 in reply to Marx Pan
    Intellectual 315 points

    Dear Chris,

    Would you mind to provide me your email?

    I can send the pdf schematic file.

    Thank you.

  • 0 in reply to Marx Pan
    TI__Guru 73181 points

    Hi Marx,

    Chris is actually out of the Office for the rest of the week. If you'd like you can send me the PDF (duynguyen@ti.com) and I can forward/CC you to Chris. I suspect he will get back to you on Monday of next week.

    -Bobby

  • 0 in reply to Chris Ayoub
    Intellectual 315 points

    Dear CHris,

    1.Our current design:

    (1)VCC=5V,Forceoff_bar=Forceon=VCC

    (2)Dout and RIN are floating.

    2.

    (1)I try to  pull Din to Vcc. The power consumption is the same.

    (2)I try to  pull Din to GND. The power consumption is the same.

    Thank you.

  • 0 in reply to Marx Pan
    TI__Genius 15345 points

    Hi Marx,

    I am going to continue looking into this. In the meantime, do you think this device could be damaged? Have you tried replacing it and running this test again? Also is this the only test that this device is failing.

    Best,

    Chris

  • 0 in reply to Chris Ayoub
    Intellectual 315 points

    Dear Chris,

    I did this testing on last Friday.

    (1)Pull Din to Vcc (4.7K Ohm):5 times

    (2)Pull Din to GND(4.7K Ohm):5 times

    After checking the power consumption, I also use COM port mouse to check the RS232 function under S0(WIn10 OS running mode). it work.

    Thank you.

  • 0 in reply to Marx Pan
    TI__Genius 15345 points

    HI Marx,

    Would you be able to send scope shots of the V+/V- waveforms? Does this COM port mouse check if the device can transmit and receive signals normally?

    Also I didn't see a charge pump capacitor in the schematic, is this included somewhere else in the schematic.

    Were you able to replace the device and verify that the same issue happens with another device?

    Best,

    Chris