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LPC84x ADC current?

Question asked by mike hackett on Mar 11, 2020
Latest reply on Mar 11, 2020 by xiangjun.rong

LPC84x part.  Maybe ADC curent specified wrong

Hi.

Just checking my design for the current it takes using the LPC84x part.

There is a large current spike I can't account for when I do some A2D measurements.

In data sheet LPC84x (Rev. 2.0 — 6 November 2019)  on page 54, the current draw for vthe A2D when in full active mode is specified 79uA (@12MHz).

This is the same current as in all modes of operation, low power, full mode etc (to within 1uA) .

A s a comparsion the LPC82x takes 1990uA in full mode.  Which is the magnitude of the unknown current spike.

Is the LPC84x ADC 79uA in full mode, or is it closer to 1990uA as specified for the LP82x.

 

Thanks

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