EB-094 DMOS Motor Driver Board (using L6206)

[triokenwood]

Hi all,

I was wondering if anyone can help.

I am trying to control a simple DC motor attached to an EB-094 motor driver board, and to create a flowchart to test the principles of operation using Flowcode7.

However - there is no 'component macro' for this EBlock, and (although I have searched fairly thoroughly) I cannot find any simple example code to drive the board.

I can actually get the board to work - using the simple generic PWM component macro, but I don't feel that this is the right way to do things. Apart from still then needing to control other pins (such as the Motor Enable signal, and to monitor the Motor Over-Current Detect flag), I believe that using the generic PWM macro is just loading my final HEX file with a whole load of code that I do not need.

Does anyone have a "starter for ten" that they can ofer?

Is there any intention fo provide a simple test flowchart and example flowchart for every EBlock - most seem to have 'some' level of support, but I haven't seen any updates since 2013.

Cheers,
Bill

[EtsDriver]

Hi!

EB094 needs these connections:

P0 Bridge A enable (Motor output goes to HighZ if Low, high to enable control)
P1 Bridge A protection (HIGH if OK, LOW if Problem detected)
P2 Output A1 control, (High = IN1A sources VPwr / Low = sinks to GND.)
P3 Output A2 control, (High = IN2A sources VPwr / Low = sinks to GND.)
P4 Bridge B enable (Motor output goes to HighZ if Low, high to enable control)
P5 Bridge B protection (HIGH if OK, LOW if Problem detected)
P6 Output B1 control, (High = IN1B sources VPwr / Low = sinks to GND.)
P7 Output B2 control, (High = IN2B sources VPwr / Low = sinks to GND.)

Basically the EB094 enables you to have different states for the motor:

Code: Select all

                        1 2 ENA
HighZ                   x x 0
Brake to GROUND         0 0 1
Brake to VPwr           1 1 1 
Forward                 1 0 1
Backward                0 1 1

1. To get motor drive Forward, you need first enable it by putting the Bridge to controlled mode (Drive according pin to HIGH).
2. After enabling, you can read the Thermal pin to check if it even is possible to drive motor.
3. Then you set another output pin (IN1, IN2) to VPwr state, and other to GND state.

4. To stop motor, you can put both pins to VPwr or GND state to get motor to brake...
Or to let it freely come to stop by turning the control pin to low, to get bridge to HighZ state.. <-- NOT RECOMMENDED ACTION; CAN KILL YOUR EB094 IF MOTOR BACKWARD CURRENT TOO HIGH. But all students did this on smaller motors, and no EB094 were killed or harmed by these actions...yet. *Knocks wood*

To drive motor at variable speeds, you can use PWM to drive the other signal, but this might make your mileage vary.
--> According to the datasheet, the L6206 can withstand pretty much..
http://www.st.com/content/ccc/resource/ ... 002346.pdf

And i recommend checking out the EB094 datasheet too! http://www.matrixtsl.com/resources/file ... 4-30-1.pdf

[triokenwood]

Thanks for the feedback EtsDriver,

However - I have no problems with actually 'controlling' an L6206 (such as is on the EB094). I have the datasheets, and I actually have a fully functioning FC7 flowchart (PWM speed control, forward/reverse direction change, motor enable/disable, an motor over-current detection).

The problem is thatI am not sure if I have created the flowchart 'correctly'.

I have used two (generic) PWM component macros to give me PWM output on two pins of my PIC chip (18F2331, Channel 1 on Port C.2 and Channel 2 on Port C.1). Both have been configured as per their default settings, other than to chnage the Prescaler value from 1 to 16 - to give a longer period / lower frequency for the base PWM signal.

Thereafter, I have to use 'Output' to control the ENABLE signal (on Port C.0 in my case) and 'Input' to read the state of the OCD signal (on Port C.3).

Obviously I have to set the Duty Cycle of one of the PWM signals such that I can control speed - and have to set the Duty Cycle of the other PWM channel to '0' to allow motion to take place. Swapping this gives me the ability to control direction.

If I need to 'hold' the motor at a given position, I then take both PWM Duty Cycles to '0'.

The two questions I was really posing were:-

• "Is what I am doing 'correct', or is there a better way?"
  "Is there any example code for use with the EB-094 - after all, nearly every other EBlock has such resources available?"

I have not been able to find any 'resources' for EBlocks produced since 2013 - has Matrix stopped offering such utilities, leaving customers to 'puddle around' in some vain hope of achieving something?

Cheers,
Bill

[QMESAR]

The two questions I was really posing were:-

"Is what I am doing 'correct', or is there a better way?"
"Is there any example code for use with the EB-094 - after all, nearly every other EBlock has such resources available?"[/list]

Hi Bill,
I would advise you to look at the Power switch module of the 18F2331 as this module is designed to run Power switching which allows you to control a motor in very fancy ways what you are doing with the normal PWM blocks is fine
and by useing them you have no other option to do as you are doing ,
I would move my Control of the motor to the Power Switch Module if I were in you position

Here is an example FC 6 Code to run a DC motor with the Power Switch Module on an EB022 hope this helps you

[Benj]

Here is an example using the EB094 board and the EB091 hardware for our DSP motor control solution.

The EB091 target can be changed to the chip of your choice.

1. SpeedControl-Basic.fcfx

(9.31 KiB) Downloaded 467 times

1. PositionControl-Basic.fcfx

(11.05 KiB) Downloaded 477 times