Hello i have a problem with my pololu 24v21 motor driver. I have connected pwm and slp pin to 3.3v, dir is on 3.3v or 0v not important, gnd to same ground of the battery powering the driver, and flt pin through 10k ohm resistor to 3.3v. In this situation the the fault pin is on high so there is no fault, but my outa-outb voltage is 0V. Other pins i left not connected to anything. My vin is 12V. I tried everything, but im scared that my driver is fried somehow. Does anyone have any suggestions what to check if its still alive.
thank you
Hello.
Since we have multiple products with 24v21 in the name, I just want to clarify that it sounds like you’re referring to the G2 High-Power Motor Driver 24v21.
Could you post some more details about your system? For example, what are you using for your 12V power supply, and do you have a motor connected (if so, what motor are you using)? Also, could you post some pictures of your setup that show all of your connections?
By the way, the nSLP pin is pulled-up by default, so you shouldn’t need to drive it high (although it generally shouldn’t cause any problems to do so).
Brandon
Sorry for not defining the model i am using and yes your right i am using this one. So my 12V source is a battery and i dont have a motor connected, i mean i tried also with a motor, but it didnt work. The name of the motor is mini motor pcc24mp4n. Its weird to me that with that setup it worked once but now its not working.
Thank you for the additional information; could you post some close-up pictures of the underside of the driver as well? Also, could you check the voltage between the 3V3 (out) pin and GND to make sure it is outputting 3.3V as expected? Be careful not to accidentally short this pin to the neighboring VM pin as doing so will damage the board.
By the way, as mentioned on the product page, please note that for good performance we highly recommend installing a large capacitor across the motor supply and ground close to the motor driver (generally at least a few hundred μF at rated for around twice your operating voltage).
Brandon
so if it is not outputting 3.3v, this means it is damaged? I did also put the capacitor 470uF capacitor, before when it was running, but then when it stoped i dismanteled it, because i thought that could be the problem.
When the board is powered (and not in the low-power sleep state), the 3V3 (out) pin should output 3.3V. If it is not, then the integrated regulator is probably damaged.
To check this, you can power the board through VIN with nothing else connected and measure the voltage between the nSLP pin and ground to verify it is high. If it is, you can then check the voltage on the 3V3(out) pin, too.
Brandon
okey so i did test it and when i connect 12v to vin the sleep pin is on 4.5v, and the 3.3v pin is on 3.25v and the VM pin is also on 12v.
Okay, since all of that sounds normal, could you try just connecting a logical high voltage (i.e. 3.3V or 5V) to the PWM pin and measuring the voltage between the motor output pins (OUTA and OUTB)?
If you still get no voltage at the motor output pins, could you post some close-up pictures of the underside of the driver board?
Brandon