Circuit translates I~2C voltages

摘要

This Design idea explores level-shifting an I~2C bus from 5V/ground (positive domain) to ground/―5V (negative domain). In multisupply systems, you sometimes face a situation in which digital information stored in logic circuits running from 5V to ground needs conversion to analog signals referenced to a negative supply. Converting from digital to analog in the positive domain and then level-shifting to reference the negative rail introduces errors and results in a large component count.