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ADS1292: CLK pin state: can I connect it to gnd?

Pedro Ulhoa
Prodigy 30 points
Part Number: ADS1292

Tool/software:

Hi! I am using the ads1292 IC and I would like to know if I can tie the CLK pin to ground using a pull-down resistor (100k ohms). I am not using external clock and I let the CLK_EN bit to default mode (without clock output in the CLK pin), so the CLK pin should be in 3-state mode, according to datasheet (page 28).

While we're in this subject, can I also tie START pin to ground so I can control the conversion by bus commands?

Best, Pedro.

  • 0
    TI__Prodigy 700 points

    Hi Pedro,

    Thanks for reaching out on the forum!

    By default, the oscillator clock output is disabled (bit 3 is 0). Since you're not using an external clock, I assume you have CLKSEL pulled high. 3-State means tri-stated, so the pin is internally disconnected. You can leave the pin floating, no need to tie the CLK pin to anything.

    As far as the START pin is concerned, it looks like you have a choice between using it or the START opcode to begin a conversion. In section 8.5.1.9:

    You can tie START to GND and issue START commands via the bus.

    Hope this helps!

    Shane