Tool/software:
Hi,
I want to confirm my understanding of the DRV8243P (SPI (P) = variant). I am using two DRV8243P's each configured as a single full bridge to control two seperate DC brushed motors. To reduce the amount of pins used I want to control them over SPI in a daisy chain configuration.
As far as I can see, the drivers can be fully controlled over the SPI registers (SPI_IN Register) without needing external HW control signals. Is there any way to control the speed via the SPI registers or would it just toggle between 0 and 100% duty cycle whenever activating the driver?
If no speed is settable trough the SPI registers, could one use a PWM signal on the EN/IN1 pin in the PH/EN mode and then use the SPI registers to write to and activate the driver? So in essence combining the two control modes? Or are these mutually exclusive, so using SPI to control the driver would disable the EN/IN1 and PH/IN2 inputs?
Alternatively, if I am to control only with SPI, would DRV_OFF be tied HIGH, EN/IN1 and PH/IN2 tied to GND or left floating?
Br,
Mathias