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ADS131E08: Reserved bit flipped on factory programmed register

user5018898
Intellectual 770 points
Part Number: ADS131E08

HI, 

I have been using ADS131E08 for some time now and I noticed my board is now not behaving as expected. After checking the device registers I noticed that the ID control register now reads 0xC0 as opposed to the original value of 0xD2. After I noticed this the device was only outputting the first 4 channels. I am assuming the device was damage due to an ESD event as right before I noticed this change of device behavior I was handling the board and my ESD strap came disconnected.

Can you help shed some light on how these values could be changed? The main concern is if this was not an ESD related damage then I would need to understand what can change these factory programmed registers so I can prevent it in the future. 

Thanks, 

Jose

  • 0
    TI__Guru 55152 points

    Hi Jose,

    Over time, has anything in the code changed? Incorrect device ID is typically caused by improper power-up routine. Please review 11.1 Power-Up Timing and Figure 53. Initial Flow at Power Up carefully to ensure all necessary steps are being followed. 

    It is possible, however unlikely that the device was damaged due to ESD. If this is in fact the case, I would recommend replacing the device with a new one to see if the issue persists. 

  • 0 in reply to Alexander Smith
    TI__Intellectual 770 points

    Hi Alexander, 

    The program code is in active development so it is changing constantly at the moment but I would not expect that the ADC driver code to have changed recently. The power supplies have been changed recently to improve efficiency so ill need to check to ensure the timing is followed correctly incase this was the cause for the issue. 

    I did replace the device and everything is working fine now. I tried to power cycle the device and reset it hoping it would reset the register value but the device was still in this permanent state. Can the power supply sequencing permanently brick the device register this way? Or is it expected to be recoverable if it is a power issue?

     Thanks, 

    Jose

  • 0 in reply to user5018898
    TI__Guru 55152 points

    Hi Jose,

    No, improper power sequencing wouldn't permanently brick the device, After proper reset and power-up it should go back to normal operation.