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TLV1922: Double-checking logic

Roy van Lierop
Prodigy 10 points

Part Number: TLV1922
Other Parts Discussed in Thread: LM393LV

Hi,

I'm trying to use a single TLV1922 to detect undervoltage conditions of two 9V block batteries.

They're in series so I'm using an op-amp subtract circuit to get the top battery voltage referenced to the most negative potential.

Now the wording of the TLV1922 is a bit difficult for me to understand.

When both IN- and IN+ are within the common mode voltage range:

  1. If IN- is greater than IN+ and the offset voltage, the output is low.
  2. If IN- is less than IN+ and the offset voltage, the output is high.
  3. If IN- is equal to IN+, the output state is technically indeterminite and output state is determined by the random polarity of the internal offset votlage.

So with a does this mean the output is active and asserted low or is the other way around?

Schermafbeelding 2026-07-02 084844.png

(The +3.3V is referenced to -9V, not to GND)

Thanks!