STSPIN840 PWM and PH signal management

[Minkyu Kim]

For PH 0 & PWM 1, is the current OUT1 -> OUT2 correct?

I think the picture below is an act for the above case. 

If my guess is wrong, how do I rotate the motor in the reverse direction?

[Dario CUCCHI · Accepted solution]

Hi @Minkyu Kim​  and welcome to the ST community !

Thanks for your remark, you are correct: there is a typo on the datasheet.

When PH = 0 and PWM = 1, the current flows from OUT2 -> OUT1.

The typo will be fixed in the next datasheet release.

Have a good day !

[Minkyu Kim]

Hello Dario CUCCHI.

Thanks for reply.

I have additional question.

Page 19 in datasheet, R_EN and C_EN's value are 39KΩ and 10nF.

In the graph that is the basis of the recommended value, the value of V is 3.3V.

Also in page 18, FAULT and EN pins in MUC are tied Driver's EN/FAULT pin.

And this typical schematic, each EN/FAULT pin's resistor is tied V_DD.

Do they have to be tied to 3.3V or is it okay to configure as shown in Figure 9?(In this case, VDD means the MCU's EN pin is 3.3V?)

A lot is difficult because it is the first time to design.

Thanks for your help.

Best regards,

Minkyu Kim.​

[Dario CUCCHI]

Hello Minkyu, thanks for opening in another post the new question about EN/FAULT.

Here the link !

[dungeonlords789]

"The typo will be fixed in the next datasheet release."

We still wating new datasheet! Not from 18-May-2018