PIC Chip recommendation

[Tobias]

I need to control the speed of four electric motors. All four will have feedback hall effect style sensors. All four motors will need to match a speed dictated by one incoming PWM. Two motors are paired together. Each pair needs to be timed to each other based on the hall effect data. Sometimes the hall effect trigger wheel teeth will need to be totally opposite and other times teeth signals need to match.

To summarize
1 Incoming PWM to control speed for all four motors.
4 incoming pulse signals from hall effects to measure rpm of each motor and compare timing of the paired motors.
4 HPWM outputs to control motor speed.

Ideally I would like to do this with one PIC. I have the room on the PCB for two PICS if there isn't one around that will handle the requirements.

Thanks in advance.

[Tobias]

Here is a basic schematic, the PIC on the schematic is just to show inputs/outputs.


I need to control the speed of four electric motors. All four will have feedback hall effect style sensors. All four motors will need to match a speed dictated by one incoming PWM. Two motors are paired together. Each pair needs to be timed to each other based on the hall effect data. Sometimes the hall effect trigger wheel teeth will need to be totally opposite and other times teeth signals need to match.

To summarize
1 Incoming PWM to control speed for all four motors.
4 incoming pulse signals from hall effects to measure rpm of each motor and compare timing of the paired motors.
4 HPWM outputs to control motor speed.

Ideally I would like to do this with one PIC. I have the room on the PCB for two PICS if there isn't one around that will handle the requirements.

Thanks in advance.

[rsocor01]

Tobias,

To find a chip that meets all of your project requirements use the Microchip Advanced Part Selector (MAPS)

http://www.microchip.com/maps/microcontroller.aspx

[Bruce]

My choice would be the PIC18F4431. Use 1 input capture to read the incoming PWM signal. Use a 2nd input capture to read 4 hall sensors through a 4066 quad switch. Just select the motor sensor to read with 4 outputs to the 4066 for channel select.

Use the PCPWM module with 4 odd PWM outputs enabled for your 4 motor outputs. You can change the duty cycle for each of your 4 PWM outputs by writing to each duty cycle register. PDC0, 1, 2 and 3 as needed.