The ISET2, MODE, and CE pins have an absolute maximum voltage rating of 7 volts. The data sheet does not give an absolute maximum on input current. I want to pull those pins high but I don't know the best way to do that because the input voltage that I will be working with could on occasion go as high as 12 volts.
1. Is it ok to use pin 1 (VREF) to pull pins 7, 8, and 9 high? Could they be tied directly to VREF or would a pull up resistor be required?
If I can't use VREF for the pull up voltage, then the following questions apply.
2. If I connect any of the pins 7, 8, and 9 (ISET2, MODE, and CE) to a 100k resistor whose other terminal is tied to pin 4 (IN) and to 12 volts, will it cause a malfunction or damage to the part?
3. Is it ok to tie pins 7, 8, and 9 together and then pull them all high using a single resistor to pin 4?
If that doesn't work, then my solution would likely be to use a 5.2 volt zener to limit the voltage. And that brings one more question.
4. Can pins 7, 8, and 9 be tied directly to a 5.2 volt zener limited source derived from the voltage at pin 4 (IN)?
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