DRV2510-Q1: Transformer primary being driven by a haptics IC

Part Number:DRV2510-Q1

Question for the Haptics driver folks.

Any issue with using the DRV2510 / DRV2511 in driving the primary of a transformer with these ICs?

The Datasheet is unclear as to how it operates... for example, there is a register setting for a 400kHz or 500kHz setting: what is this for?

I'm guessing that when IN+ is high and IN- is low the device drives the OUT+/- pins with the 400 or 500kHz signal.

Is this correct?

Figure 5 in the datasheet is good in showing the relationship of OUT+/- to the solenoid current... do you have a similar figure showing the IN+/- relationship to OUT+/-?

Is it 1:1? (datasheet doesn't say).

Last item: Figure 17 in the datasheet shows pins FS0, FS1 and FS2... what are these? (two are SDA and SCL... and the 3rd one?)

Thanks!