PCA9703 current limit

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PCA9703 current limit

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gmarq922
Contributor I

I am trying to drive a series of 35 SSRs with a quantity of shift registers  using a common SPI bus. The SSRs will draw 3mA each. My idea was to sink each 3 mA current through a different unique GPI pin when I command it low, as a low-side switch . so one GPI pin is for only one SSR. Can I do this with the PCA9703? It seems that I can't, and the device cannot tolerate such current. Which is it?

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guoweisun
NXP TechSupport
NXP TechSupport

Each input pin of PCA9703 can sink 100uA.

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