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Mode selection by pad

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minhchau

minhchau

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Hi everyone,
In some datasheet of IC, the modes of IC is determined by a pad (3 mode - floating, connect to VDD, connect to VSS).
Any circuit can do that?
Thanks,
minhchau
 

In an analog circuit, bias the pad to mid supply by a voltage divider, use two comparators with 1/4 and 3/4 VDD threshold. Digital chips might also test the connected impedance by sequentially operating switch transistors.
 

    minhchau

    minhchau

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