Q: The MAX6900ETT parts with an AEQ topmark seem to have a different pinout than that for the AEU version listed in the datasheet. Why is that, and what is the correct pinout?
A: The version with the AEQ topmark was an older variant of the part. The changes are a small die revision (swap of Vcc and GND) and a package revision (die rotated).
The AEQ pinout is as follows:
Pin 1 = X1
Pin 2 = X2
Pin 3 = VCC
Pin 4 = SCL
Pin 5 = SDA
Pin 6 = GND