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ADS1248 reset

Chris Forte
Intellectual 310 points

The datasheet indicates 0.6ms on pg 34, but on pg 32 under "ADC POWER-UP" , 2e16 clocks would calculate to 16ms. 

Which is the correct value to delay the SPI?

  • 0
    TI__Guru* 92715 points

    Chris,

    The length of delay for SPI communications depends on the nature of the reset.

    At power-up, when the device is first powered on and supplies are coming up as described on page 32, there is a count of 2^16 system counts to start the device, which is about 16ms when the system clock is 4.096MHz. This is only found when the supplies are coming up for the first time. It's intended to allow for more time to get the device supplies to settle to final value.

    In comparison, if the /RESET pin is toggled or the RESET opcode is issued as described on page 34, then there is no added system clock count and SPI communications can begin 0.6ms after the /RESET pin is returned high.

    Joseph Wu