• State TI Thinks Resolved
  • Locked Locked
  • Replies 7 replies
  • Answers 3 answers
  • Subscribers 46 subscribers
  • Views 1408 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

LMP90080: Dear Precision data converters team.

Gerald Choi
Expert 1400 points
Part Number: LMP90080
Other Parts Discussed in Thread: , LMP90100

Dear Precision data converters team.

I have some question about LMP90080-Q1

1. Can we use to direct to VINx through Voltage devided without OP-AMP?


2. is it default GPIO_DAT when is default as a below?


3. Has LM90080-Q1 a isolation in IC like as a below?
If it has isolation what is Vrms?

4. LM90080-Q1 has suffix Q1. However, The Q1-certification information hasn't in datasheet?
Can I get information about Q1 certification?

Best Regards

Gerald

  • 0
    TI__Guru* 97585 points
    Gerald,


    1. Yes, you could measure an input that comes from some voltage divider without some sort of buffer. The only problem that you need to be concerned with is that the differential input impedance with the buffer on is 15.4MΩ. With the FGA, the input impedance is measured just as the equivalent input leakage current. It depends on how you have the buffer set up, but in most cases the input impedance is likely high enough.

    2. The default for GPIO_DIRCN is 0 so at startup, the GPIO is an input. Because of this the default GPIO_DAT is whatever you put on the input and isn't listed in the datasheet. If the GPIO pin is floating, as far as I know, there is no pull-up or pull-down, so the input is undetermined.

    3. I do not know of any example isolation layout for this device or package. I can't give any recommendations HV layout like this.

    4. I don't have any information on the quality tests run for this device. I'll need to check on this and post back later.


    Joseph Wu
  • 0 in reply to Joseph Wu
    Expert 1400 points

    Hi Joseph 

    Thanks for your fast replay.

    1. 3. I do not know of any example isolation layout for this device or package. I can't give any recommendations HV layout like this.

    ==> I search HV/ISOLATION layout on datsheet as a below. Can I get more information like Vrms so on.

           Don't you any rocommendation as a blow?

    2. Can I get application schematics about SINGLE END AD INPUT, GPIO OUT for LMP90080-Q1?

    Thanks

    Best Regards

    Gerald

  • 0 in reply to Gerald Choi
    TI__Guru* 97585 points

    Gerald,


    1. Now I understand the isolation question. I didn't realize that this was on the end of the datasheet. The LMP90080 does not have any high voltage or isolation for any of the pins. The diagrams for the packaging are automatically put at the end of the datasheet based on the package used for the device. This device uses the PWP-28 with a power pad. This package may be used in other devices with high voltage or isolation, with different layout requirements. However, it is not used for this device.

    2. I don't have any applications schematics for this set of devices. If you search for the LMP90100 there may be more information about how a typical application is run. There is information about programming and how to use this device:

    www.ti.com/.../snaa134
    www.ti.com/.../snaa075
    www.ti.com/.../snaa074

    And a basic explanation of how to make some simple connections:

    www.sensorsmag.com/.../a-new-class-sensor-analog-front-ends

    3. I'm still looking for the automotive qual tests for this device. Finding more information about the automotive grade may take more time.


    Joseph Wu

  • 0 in reply to Joseph Wu
    TI__Guru* 97585 points
    Gerald,


    I talked a quality engineer and this is what we discovered. The LMP90080-Q1 was qualified under AEC-Q100 Rev G in 2013 as Grade 0. Tests run for this qualification were HTOL at 150°C for 1000hrs, Biased HAST, Temp cycle (2000 cycles, -65 to 150°C), ESD and Latch-up.

    Let me know if you have any other questions about this device.


    Joseph Wu
  • 0 in reply to Joseph Wu
    Expert 1400 points

    Thanks Joseph Wu

    Can I get that "The LMP90080-Q1 was qualified under AEC-Q100 Rev G in 2013 as Grade 0. Tests run for this qualification were HTOL at 150°C for 1000hrs, Biased HAST, Temp cycle (2000 cycles, -65 to 150°C), ESD and Latch-up" as document like datasheet ?

    Best Regards

    Gerald

  • 0 in reply to Gerald Choi
    TI__Guru* 97585 points

    Gerald,

    I'll see what I am able to give you. May I contact you through the email that you provided to e2e?

    Joseph Wu

  • 0 in reply to Gerald Choi
    TI__Guru* 97585 points

    Gerald,

    I got a reply from the support group that can get you information about the reliability report. Go to:

    From there, select Quality, Reliability, Environmental from the tab. You'll need to fill out more information about the customer and application, but you should be able to get what you need.

    We're also checking on the datasheet status. Regardless, use the online support form and you should be able to get more information.

    Joseph Wu