Hello All!
I am working on a little project similar that involves a lot of haptic feedback.
So I needed a way to drive about 12+ ERM vibration motors with a few cables (i.e. NOT 12 pwm lines running to each motor). Each motor has its own PCB.
To this end, I designed a little circuit using 2 d-type flip flops that essentially make a 12bit shift register.
The datasheet for the flip-flops is here: http://www.ti.com/lit/ds/symlink/sn74hc74.pdf
On the output of each of the boards there is a PWM line comming out and this connects to a TI DRV2603.
Datasheet for the TI motor driver: http://www.ti.com/lit/ds/symlink/drv2603.pdf
Anyway, here is what I am really struggling with. Whenever I solder in the TI ERM driver in what I believe is the correct orientation, the circuit instantly shorts when I put it in my breadboard ( I have tried this several times). Trying the other orientation does not instantly short the circuit, but it does not drive the ERM either. Even though the PWM is in fact driven.
Here is the schematic and couple pictures of the PCB.
(Note that the LED and Transistor are not populated for this board)
And just to show that my soldering isn't the problem:
Thanks in advance!!