Hi everyone,
I've been using the LP55231 for several designs already, it's a great chip. I currently have a design with specifics that yield questions not answered in the datasheets or in the forum. I should mention that my current design uses 2 LP55231 and that it needs synchronization between the 2 units. My questions regard the triggering function on the LP55231:
- The datasheet mentions a typical application with 2 LP55231 "chained" by the TRIG line (without a micro-controller triggering), this is an interesting use case but if triggering needs to happen from a Microcontroller, are there any pitfall to be aware of in connecting the two units to the micro-controller? Does this work more or less like any other open-drain, I2C bus like systems?
- The datasheet mentions pullup on the TRIG line with values between 120 kΩ and 180 kΩ if 2 devices are present. These are very high values (compared to, say, a typical open-drain I2C bus) and I was wondering if there was any significant current going through TRIG to demand such high pullups. Furthermore, is it possible to get smaller pullups in the 13-20 kΩ instead without risking issues with either high current consumption or simply the unit not triggering at all. Generally speaking, it would be great to know what's the logic behind the choice for high value resistors for TRIG.
Any info will help.
