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TPS3897 - To Monitor 5V supply

Antony
Intellectual 300 points
Other Parts Discussed in Thread: TPS3897, TPS3710, TPS3839, TPS3890

Hi,

We have a requirement to monitor  +5V power supply , When the voltage drops below 4.5 volts we need  to indicate the status via LED and the same input is give to 1.8V tolerant GPIO.

Right now we have selected this part (open drain) for this solution.

We would like to get a clarify with you guys for a better solution. 

Regards

Antony 

  • 0
    TI__Genius 13525 points

    Hi Antony,

    It seems to me that the TPS3897 should work in this application, so in order to help me provide you with a device better suited for this application I'll need some more information on what your key needs are for the supervisor. Another thing that might help me is telling me what aspects of the TPS3897 are not ideal for your application and why.

    -Kyle Van Renterghem

  • 0
    TI__Mastermind 44770 points

    HI Antony,

    The TPS3897 can do this. Other choices could be the TPS3710 or TPS3839 (TPS3710 can be much more precise).

    Regards,

  • 0 in reply to JCHK
    Intellectual 300 points
    Hi John & Kyle,

    Thanks for the quick replay

    Hi John ,

    I like the other two parts which you've shared , But we have TPS3897 right now in our inventory.

    I have posted the TPS3897 schematics in other thread , can you please take a quick look and let me know your opinion.

    e2e.ti.com/.../515996


    Thanks
    Antony
  • 0 in reply to Antony
    TI__Genius 13525 points

    Hey Antony,

    One other device you may be interested in is the new TPS3890 which we are currently releasing and it should be orderable in approximately 2 weeks. You can find the product folder at http://www.ti.com/product/TPS3890/description 

    • Power-On-Reset (POR) Generator with Adjustable Delay Time: 40 µs to 30 s
    • Very Low Quiescent Current: 2.1 µA (Typical)
    • High Threshold Accuracy: 1% (max)
    • Precision Hysteresis
    • Fixed and Adjustable Threshold Voltages:
      • Fixed Thresholds for Standard Rails:
        1.2 V to 3.3 V
      • Adjustable Down to 1.15 V
    • Manual Reset (MR) Input
    • Open-Drain RESET Output
    • Temperature Range: –40°C to +125°C
    • Package: 1.5-mm × 1.5-mm WSON

    -Kyle