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ADS1262: Using and disabling the external XTAL

Carlo Magnaghi30
Prodigy 130 points
Part Number: ADS1262

We are experiencing a problem with some external crystals that stop operating after months in the field, after having passed tests at our and at customer facilities.

In most case the failure becomes permanent and the unit must be repaired; replacing the crystal or forcing the ADS1262 to operate on the internal RC by shorting CLKIN to ground solves the problem.

Is it possible to force the use of the internal RC by firmware? The problem could then be solved by a firmware upgrade.

We are using an ABRACON ABMM-7.3728MHZ-B2-T crystal (Mouser part 815-ABMM-7-B2-T) instead of the recommended crystal because of the lower height of the part.

  • 0
    TI__Mastermind 44680 points
    Hi Carlo,

    Unfortunately, the only way to force the internal oscillator to be used through firmware, would be if you had a GPIO pin connected to the XTAL1/CLKIN pin. Apart from that, there aren't any SPI commands to the device that can control the clock source.

    If you find that the crystals are wearing out pre-maturely, it might be worth looking at the power-dissipation across the crystal. By increasing the load capacitance on the crystal, you can shunt more current to ground and perhaps see if that helps to extend the life of the crystal.

    Alternatively, it should be possible to change the XTAL1 load capacitor to a 0-Ohm resistor to force the ADS1262 to use the internal oscillator.

    Best regards,
    Chris