hello everyone.
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?
1) If you disable the sync input the motors will make a slight hissing noise,
but the performance will be better. So it is best make sync input low.
2) Yes, the supply voltage for the controller can be much higher than the
rated voltage for the motor. The controller output is regulated so your
motor will not be damaged
3) yes
4) The logic inputs in the SLA work between 0 and 5V. If you can run the
ATMEG at 5V you don't need pull ups.
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.
Thank you, John, i got it, ^_^，but one more question.
in the figure of page 11, i think Q1 is wrong,should it be reverse. i think the direction is from S to G,not from G to S.
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.
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