did anybody use the SLA7062 to drive and control the stepper motor?
i cant understand something
1\what does the SYNC use for?
2\the rated voltage of my motor is 6.6V,but VBB is just from 10V to 44V, what should i do? connect them directly?
3\are the RsA and the RsB same?
4\if i use ATMEGA64 to control it, should i use some appropriate pull-up resistors?
One is Power-ground and the other is Signal-ground. It has to do with noise that occurs on the ground line (especially in the power ground) if you have long wires to the supply. This noise could cause false triggering of the input signals.
If you make a pcb with nice ground plane or thick ground tracks and keep the wiring to the buffer elco short you shouldn't have to worry about it. Just use a single ground.
I think its correct in the datasheet. It says "to produce zero current in a motor the ref voltage should be pulled above 2V, turning off all drivers"
Q1 is a PMOST, with the Source connected to the pos. suppy and the Drain to the REF node. The Gate-node labeled "disable" is confusing though, as a low (!) signal at the Gate switches on the PMOS and disables the drive. So it should have stated "enable".
On the other hand you probably don't need the disable feature so you might even leave it out.