• State TI Thinks Resolved
  • Locked Locked
  • Replies 4 replies
  • Answers 2 answers
  • Subscribers 78 subscribers
  • Views 379 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

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.

MSP430F67641A:

CHANDRA SEKARAN VT
Prodigy 235 points
Part Number: MSP430F67641A
Other Parts Discussed in Thread: MSP-ISO, , EVM430-F6736, MSP-FET

Sir,

We were using 71M6533-IGT with ADM51 emulator.

Due some connection issue, the emulator got burnt.Now getting them repaired appears to be difficult.Also understandably, 71M6533 itself is getting obsolete and they are changing the micro in the chip from the earlier 8051 core.

Ours being a custom design applications, I want to check if I can migrate to TI about which we are very familiar..We are using MSP430 FR series in many applications.

Hence I am considering to use TI energy metering devices .

I wish to know the following:

#1.The accuracy and repeatability with  71M6533 was very good.Does TI energy meter IC'S match this.

#2. 71M6533,had a good WDT feature in which there was an external pin for enabling the WDT after emulation/fusing the code.

      But in MSP 430 application we use external watch dog, because we felt that using watch dog in MSP430 is lacks the feature that is with THE WATCH DOG OF   71M6533 .It appears its watch dog in 71M6533  is an uncluttered stand alone device enhancing the functional reliability..

#3.In TI energy meter IC is the battery backed RAM power supply& system power supply same or different .The battery input in    71M6533 backs only the 7 bytes RAM&RTC.This scheme is better for battery life, because if the power supply pin is same for all,that is, RTC,RAM&CPU, then on each POWER DOWN, for a while till the chip gets into LPM 4 mode there is a considerable drain on the battery for a while.

#4.Does TI have a GALVANICALLY ISOLATED FET for emulation.Can TI's  MSP-ISO be placed in between FET&COMPUTER USB port  so that  mistakes like what happened with us today while using the ADM51 can be avoided.

Regards

VTC

  • 0
    TI__Mastermind 26420 points

    Hello VTC,

    Welcome to the E2E Forums!  I'm glad you are considering a TI for your Metering solutions. I'll do my best to address your questions below and point you to some good TI Resources.  

    1.  Accuracy is obviously a very complicated topic and I'm not familiar with the 71M6533.  I would encourage you to look through our TI Designs using the MSP430F67641A.  You can find a few of there here: http://www.ti.com/product/MSP430F67641A/toolssoftware   

    There is the EVM430-F6736 available for e-metering customers and there is an app note for single-phase measurements here with measurement results available: http://www.ti.com/lit/an/slaa517e/slaa517e.pdf  

    2.  The WDT_A does not offer an external pin for enabling/disabling.  This must be done in software.  For details on the full WDT, see capter 16 of the Family User's Guide: http://www.ti.com/lit/ug/slau208q/slau208q.pdf 

    3.  The MSP430F67641A offers a powerful Auxiliary Supply System (AUX).  Full Details can be found in Chapter 4 of the family User's guide and there is also a TI Design showing different usages here: http://www.ti.com/tool/TIDM-AUX-MODULE 

    There are 3 AUXVCC inputs available on the device.  AUX1 and AUX2 are alternate power supplies that can be automatically switched to and fully power the digital and analog cores.  These can be connected to batteries or super caps, and there is some basic charging circuitry available to re-charge a cap when DVCC is re-applied.  

    AUX3 powers only the Backup system (Chapter 3 of the Family User's Guide.)   This Battery Backup System only powers the RTC and 8 bytes of RAM.  This seems to be the most similiar to the functionality of your current device.  

    4.  I'm not aware of a Galvanically Isolated FET available.  The MSP-ISO is made for the MSP430 launchpads, which have a different pin-out from the MSP-FET.  It could possibly be used, but it would require wiring from FET and then to a board/EVM.  

    The EVM430-F6736 mentioned above seems to provide isolated pulses for checking the measurement results.  This could be another solution.  

    Hope this was helpful!  

    JD

      

  • 0
    Prodigy 235 points

    SIR,

    Thanks for your quick and very appropriate replies.

    We will go through and request you for any further support if needed.

    Regards

    VTC

  • 0 in reply to CHANDRA SEKARAN VT
    Prodigy 235 points

    Sir,

    I have attached a schematic for an isolated FET from Texas source.

    This uses ISO150AU, WHICH APPEARS TO BE OBSOLETE.

    I reckon we can use the latest version of this high voltage  isolator.

    But this circuit does not use TEST/SBWTCK.

    Is it alright not to use this signal for proper emulation/debug of the MSP430F67641A device with galvanic isolation.

    Regards

    VTC

    MSP-FETP430IF SCHEMATIC 260619.pdf   

  • 0 in reply to CHANDRA SEKARAN VT
    TI__Mastermind 26420 points

    Hello Chandra,

    Again, I'm not aware of an isolated FET.  The schematic you sent appears to be from the MSP-FETP430IF which is a Parallel port to JTAG adapter board.  I'm not sure how it's going to be useful.  http://www.ti.com/graphics/tool/FET430PIF.jpg 

    Anyway, all information on available debuggers can be found in the following documents:

    http://www.ti.com/lit/ug/slau647m/slau647m.pdf 

    http://www.ti.com/lit/ug/slau278ae/slau278ae.pdf 

    In the latter one, Figure's 2-1 and 2-3 show the required connections between the programming interface and the MCU for both 4 wire JTAG and SBW modes.  Maybe you could add in your own isolation circuitry.  

    Thanks,

    JD

**Attention** This is a public forum