DRV8711: Used as a stepper driver for cnc without SPI

Alexandru Ionut Cocan

Part Number: DRV8711
Other Parts Discussed in Thread: DRV8308,

Hello!

I am working on a stepper driver compatible for a PCB milling CNC machine.

The question i wanted to ask is regarding the motor enable. From what i understand, the "enable motor" feature is available only over spi by writing bit0 in register 0x0h. The problem is that i need a physical parallel command to enable the motors.

My only thought of a solution is to use a small uC to send the SPI data only once at powerOn and use the SLEEPn pin as the ENABLE.

Is there any other or easier solution for that? i worked in the past with the DRV8308 and the chip had a "memory save" function which would have been great here, but the datasheet does not say anything about this for the DRV8711.

Thank you in advance!

over 8 years ago

0 Rick Duncan over 8 years ago

TI__Guru** 114905 points

Hi Alexandru,

Some type of SPI is required to enable the device.

Do you have 4 GPIOs available in your system? These can be used to create a SPI interface.

In addition to the enable bit 0, what do you plan to do with the other settings in the DRV8711? If you have a fault, how do you plan to read the fault registers?

0 Alexandru Ionut Cocan over 8 years ago in reply to Rick Duncan

Prodigy 20 points

Hi Rick,

I was thinking of using an STM32F030F4Px because i have it at hand and I am very familiar with. I use the SPI1 interface and an other GPIO for the SCS pin and i am left with 7 GPIO pins left.

The thing is that i wanted to use as less resources as possible :)

0 Rick Duncan over 8 years ago in reply to Alexandru Ionut Cocan

TI__Guru** 114905 points

Hi Alexandru,

If you are already using the SPI1, you should need one additional GPIO to select the DRV8711.

Motor drivers

Motor drivers forum

DRV8711: Used as a stepper driver for cnc without SPI