KeepItSimpleStupid
- Joined Mar 4, 2014
- 5,088
You might be able to put the resistor in the ground lead. The circuit and the comparitor would be powered after the resistor. Then you could check for a voltage > 400mV and not need a divider. The chip itself is protected from voltages exceeding the supply voltage.
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Usually, the limits are Gnd-0.3 and V+0.3V. The substrate has an inherent Schotkey diode and when a device is unpowered V+ and GND are both zero. Usually, you have to limit the current for this protection. It would likely defeat the ability to use high value resistors.
These sub things might be scarce, so a good regulated power supply probably makes sense to remove transients and improve lifetime.
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Usually, the limits are Gnd-0.3 and V+0.3V. The substrate has an inherent Schotkey diode and when a device is unpowered V+ and GND are both zero. Usually, you have to limit the current for this protection. It would likely defeat the ability to use high value resistors.
These sub things might be scarce, so a good regulated power supply probably makes sense to remove transients and improve lifetime.
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