Other Parts Discussed in Thread: DRV8316
Tool/software:
Hi, we are using a variant of your DRV8316 3-phase motor driver. The driver is powered from a 14V supply but we wanted the ability to drive the outputs at 5V TTL logic level voltages.
In order to enable this we have connected 3 x 10k pull-up resistors between the outputs of the driver and a 5.1 volt rail. Our expectation was that when the output drivers were in a high impedance state the outputs would measure 5.1 volts. When the low-side driver is enabled the output would measure zero volts, when the high-side driver is enabled the output would measure 14 volts.
What we see in reality is a voltage of around 800 mV at the output when the driver is in high-impedance state. We swapped the 10k pull-up for 1k, the output now measures 2.74 V when it should be high impedance.
We can successfully drive the output to 14 volts or zero volts so the half-bridge appears to work
We are using the automotive variant of the device: DRV8316RQRGFRQ1.
Please find attached a screen grab of our circuit
There appears to be some sort of pull-down within the DRV8316 IC that is not defined in the datasheet. Is this associated with a particular mode of operation?
