Although powering an LSM9DS1 with 2.8V to VDDIO and VDD, I would like to use a 1.8V-logic line for one of the chip selects for ease of retrofitting an existing design with minimum upheaval. The line is push-pull, not open collector.
The sufficient-voltage threshold for a "1" digital input is usually labeled V_IH, but I could not find that parameter listed in the published specifications. What is V_IH for the LSM9DS1 digital inputs, especially the chip selects?
A corollary question -- even if 1.8V will be sufficient fully to deselect the chip-select, would using 1.8 instead of 2.8V lead to increased power consumption?