Hello Ralph,

It always communicates with TRF7960 chip when i test it. I attached my circuit diagram. pls help to check it. and also part of progarm is below.

void main()
{
    

    WDTCTL = WDTPW + WDTHOLD;                   // Stop watchdog

    // ROM RF13M module setup ** The following three lines are needed for proper RF stack operation
    DS = 1;                                     // ROM variable needs to be initialized here
    asm ( " CALL #0x5CDA ");                     // Call ROM function ( Initialize function pointers)
    asm ( " CALL #0x5CAC ");                     // Call ROM function ( Check part configuration)



    RFPMMCTL0 = PMMPW;                                    //Unlock RFPMM
    RFPMMCTL0_L |= RFPMM_EN_V_DOUB;                          //Enable the VDD Doubler
    RFPMMCTL0_H |= 0xFF;                                    //Lock RFPMM
    
    NFC_Buff[0]=0;
    NFC_Buff[1] =0;
    NFC_Buff[2] =0;
    NFC_Buff[3] =VERSION;
    
    
    RF13MCTL |= RF13MTXEN + RF13MRXEN + RF13MRFTOEN;     // set up rx and tx functionality on RF13M module
    // enable interrupts  ** Do not change the following two lines, needed for proper RF stack operatoin
    RF13MINT |= RF13MRXIE + RX13MRFTOIE;              // enable interrupts on RX and on timeout and over and under flow checking
 
 

    //initISO15693(CLEAR_BLOCK_LOCKS);//clear protection
    
    memset ((u08_t *) FRAM_LOCK_BLOCKS, 0x00, 36);        //lock NDEF area
    FRAMAccessLimit_Byte = 0xF8D0;

    

    DeviceInit();


    //Setup ADC
    //SD14CTL0 = SD14EN + VIRTGND + SD14IE; //ADC enabled, Virtual Ground enabled, Interrupt enabled.
    //SD14CTL1 = SD14UNI + SD14INTDLY0;     // Unipolar mode, Interrupt triggered after first sample.

    __bis_SR_register(GIE);
    
    //Read ambient Temperature
    Write_to_ADS1018(1);//read ambient
   
     tempi=Read_Fr_ADS1018(1);
     AmbientTemp=tempi;
    Write_to_ADS1018(0);//read TC
    TA0CTL |= MC_1;//Start Timer
    while(1)
    {
        // SD14CTL0 |= SD14SC; //begin conversion
        __bis_SR_register(LPM3_bits + GIE);
    }
}

sensor board.pdf

Hello Ralph,

Still same after i replaced 4.7uf to 2.2uF.

Hello MaLin,

Hmm I see, okay thanks for trying that out first and foremost. Revisiting your prior post,

MaLin said:

It always communicates with TRF7960 chip when i test it.

Right, I understand that, but more what I am trying to figure out is, is the TRF7960 sending and receiving data to/from the RF430FRL152H when communication suddenly stops, or is it a situation where when the TRF7960 attempts to talk with it, the device is suddenly unresponsive.

Basically, I am trying to gauge if there is any risk that the FRAM stored vector tables may have gotten overwritten on accident.

Hello Ralph,

We changed C5 which is for VDDH to 4.7uF from 100nF.  The problem doesn't happen again. I cannot sure it solved problem absolutely. but it did improve. I think the antenna picked noise cause memory power supply problem or  there is program protection  in ROM over write reset vector.

Hello MaLin,

Thanks for the update, that sounds like a reasonable solution to me, as long as the device looks to be working fine and the problem is resolved I see no issue with that modification. Thank you for sharing your current solution.

HI MaLin, Ralph  

I have the same problem on the Msp430FR5972, this happens because the Fram are in effect like ram and is not protect 

by writing in the flash section, so is possible to read and write at any time all  memory size like a ram. 

I didn't check the item RE430FRl152h memory but if is FRAM may be is the same. 

Luigi